fix(runtime-host): restore desktop Computer Use capability#2233

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Merged
M4n5ter merged 2 commits into from
Aug 5, 2026
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fix(runtime-host): restore desktop Computer Use capability #2233

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fix(runtime-host): restore desktop computer use capability
M4n5ter Aug 5, 2026
23d338b
fix(runtime): keep subagent admission rejections generic
M4n5ter Aug 5, 2026
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40 changes: 39 additions & 1 deletion apps/desktop/src/main/__tests__/runtime-host-native-capabilities.test.ts
View file
Open in desktop
Original file line numberDiff line numberDiff line change
@@ -1,6 +1,12 @@
import assert from 'node:assert/strict';
import test from 'node:test';
import type { ComputerUseToolSet, MakaTool, MakaToolContext } from '@maka/runtime';
import {
buildComputerUseTools,
type ComputerUseToolSet,
type CuDispatchBackend,
type MakaTool,
type MakaToolContext,
} from '@maka/runtime';
import type { ClientCapabilityProvider } from '@maka/runtime-host/client';
import {
decodeClientCapabilityReplaceInput,
Expand DownExpand Up@@ -54,6 +60,27 @@ test('publishes self-described session-affine Browser and Computer Use offers',
);
});

test('publishes the real Computer Use schema through the Client Capability protocol', () => {
const computerUseTools = buildComputerUseTools({ backend: computerBackend() });
const provider = createDesktopNativeCapabilityProvider({
browserTools: [],
releaseBrowserSession() {},
computerUseTools,
releaseComputerUseSession: (sessionId) => computerUseTools.clearSession(sessionId),
});

assert.doesNotThrow(() =>
decodeClientCapabilityReplaceInput({
registrationId: 'registration-1',
offers: provider.offers(),
}),
);
const coordinateSchema = provider.offers()[0]?.tools[0]?.inputSchema.properties as
| Record<string, { items?: unknown }>
| undefined;
assert.equal(Array.isArray(coordinateSchema?.coordinate?.items), true);
});

test('validates before admission and invokes the exact offered tool with Host context', async () => {
let admitted = false;
let invoked = false;
Expand DownExpand Up@@ -399,6 +426,17 @@ function computerTools(
return tools;
}

function computerBackend(): CuDispatchBackend {
return {
async preflight() {
return { accessibility: true, screenRecording: true };
},
async run() {
return { outcome: { ok: true, tier: 'ax', verified: true } };
},
};
}

function capabilityFrame(overrides: Partial<ClientCapabilityCallFrame> = {}): ClientCapabilityCallFrame {
return {
kind: 'client.capability.call',
Expand Down
10 changes: 10 additions & 0 deletions packages/computer-use/src/__tests__/maka-cu-backend.test.ts
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -469,6 +469,16 @@ describe('maka-cu backend', () => {
assert.deepEqual(received(records, 'permissions.check')[0], { prompt: false });
});

it('keeps routine preflight quiet and exposes an explicit Accessibility prompt request', async () => {
const { backend, logPath } = makeBackend();

await backend.preflight(signal());
await backend.requestAccessibilityPermission(signal());

const checks = received(await readRecords(logPath), 'permissions.check');
assert.deepEqual(checks, [{ prompt: false }, { prompt: true }]);
});

it('fails loudly on a protocol version mismatch and does not retry', async () => {
const { backend, logPath } = makeBackend({ protocol: 'maka.cu/99' });
await assert.rejects(backend.preflight(signal()), /service_mismatch/);
Expand Down
9 changes: 8 additions & 1 deletion packages/computer-use/src/maka-cu-backend.ts
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -454,8 +454,9 @@ export interface MakaCuLaunchedApp {
*/
export type MakaCuBackend = Omit<
CuDispatchBackend,
'runSemantic' | 'observeApp' | 'captureObservation'
'runSemantic' | 'observeApp' | 'captureObservation' | 'requestAccessibilityPermission'
> & {
requestAccessibilityPermission(signal: AbortSignal): Promise<void>;
observeApp(
input: {
app?: string;
Expand DownExpand Up@@ -2251,6 +2252,12 @@ export function createMakaCuBackend(opts: MakaCuBackendOptions): MakaCuBackend {
});
},

async requestAccessibilityPermission(signal) {
await withOperationQueue(signal, async () => {
await service.call('permissions.check', { prompt: true }, signal);
});
},

async listApps(signal) {
return withOperationQueue(signal, async (): Promise<CuAppSummary[]> => {
try {
Expand Down
45 changes: 45 additions & 0 deletions packages/runtime-host/src/__tests__/client-capability-protocol.test.ts
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -281,6 +281,51 @@ describe('Client Capability protocol', () => {
]),
),
);
assert.doesNotThrow(() =>
decodeClientFrame(
replaceFrame([
{
...offer('tuple_schema', 'move'),
tools: [
{
...offer('tuple_schema', 'move').tools[0],
inputSchema: {
type: 'object',
properties: {
coordinate: {
type: 'array',
items: [{ type: 'integer' }, { type: 'integer' }],
},
},
},
},
],
},
]),
),
);
for (const items of [[], [{ type: 'integer' }, 'not-a-schema']]) {
assert.throws(
() =>
decodeClientFrame(
replaceFrame([
{
...offer('invalid_tuple_schema', 'move'),
tools: [
{
...offer('invalid_tuple_schema', 'move').tools[0],
inputSchema: {
type: 'object',
properties: { coordinate: { type: 'array', items } },
},
},
],
},
]),
),
(error: unknown) => error instanceof RuntimeHostProtocolError,
);
}
assert.throws(
() =>
decodeClientFrame({
Expand Down
18 changes: 16 additions & 2 deletions packages/runtime-host/src/protocol/client-capability.ts
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -66,6 +66,7 @@ export const CLIENT_CAPABILITY_MAX_RESULT_CHUNKS = Math.ceil(
const CLIENT_CAPABILITY_INLINE_RESULT_MAX_BYTES = 40 * 1024;
const CLIENT_CAPABILITY_JSON_MAX_DEPTH = 32;
const CLIENT_CAPABILITY_JSON_MAX_NODES = 8_192;
const CLIENT_CAPABILITY_TOOL_DESCRIPTION_MAX_CHARS = 8_192;
const CLIENT_CAPABILITY_ERRORS = [
'host_not_ready',
'host_draining',
Expand DownExpand Up@@ -590,7 +591,11 @@ function decodeToolDescriptor(value: unknown): ClientCapabilityToolDescriptor {
...(record.description === undefined
? {}
: {
description: requireString(record.description, 'description', 4_096),
description: requireString(
record.description,
'description',
CLIENT_CAPABILITY_TOOL_DESCRIPTION_MAX_CHARS,
),
}),
inputSchema,
...(record.annotations === undefined
Expand DownExpand Up@@ -721,7 +726,16 @@ function validateToolInputSchema(root: Record<string, unknown>): void {
) {
visit(schema.additionalProperties);
}
if (schema.items !== undefined) visit(schema.items);
if (schema.items !== undefined) {
if (Array.isArray(schema.items)) {
if (schema.items.length === 0) {
throw invalidProtocolFrame('Invalid Client Capability tool schema items');
}
for (const nested of schema.items) visit(nested);
} else {
visit(schema.items);
}
}
for (const key of ['allOf', 'anyOf', 'oneOf'] as const) {
if (schema[key] === undefined) continue;
if (!Array.isArray(schema[key]) || schema[key].length === 0) {
Expand Down
22 changes: 22 additions & 0 deletions packages/runtime/src/__tests__/computer-use-tools.test.ts
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -1791,6 +1791,28 @@ describe('buildComputerUseTools — the `maka_computer` MakaTool', () => {
assert.match(r.text, /Accessibility/);
});

test('requests Accessibility once on first use while every action still preflights', async () => {
let preflights = 0;
let requests = 0;
const backend = fakeBackend({ accessibility: false });
backend.preflight = async () => {
preflights += 1;
return { accessibility: false, screenRecording: true };
};
backend.requestAccessibilityPermission = async () => {
requests += 1;
};
const [tool] = buildComputerUseTools({ backend });

const first = (await tool.impl({ action: 'wait' } as never, ctx())) as { text: string };
const second = (await tool.impl({ action: 'wait' } as never, ctx())) as { text: string };

assert.match(first.text, /permission_missing/);
assert.match(second.text, /permission_missing/);
assert.equal(preflights, 2);
assert.equal(requests, 1);
});

test('S12: a capture action fails closed when Screen Recording is not granted', async () => {
const backend = fakeBackend({ screenRecording: false });
backend.observeApp = async () => observation();
Expand Down
Loading
Loading
, 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
 blocks
(function() {
function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
codeBlock.parentElement.setAttribute('data-copy-added', 'true');
var btn = document.createElement('button');
btn.textContent = 'Copy';
btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';
btn.onmouseover = function() { this.style.opacity = '1'; };
btn.onmouseout = function() { this.style.opacity = '0.7'; };
btn.onclick = function() {
navigator.clipboard.writeText(codeBlock.textContent).then(function() {
btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
});
};
codeBlock.parentElement.style.position = 'relative';
codeBlock.parentElement.appendChild(btn);
});
}
addCopyButtons();
// Re-run on dynamic content
var observer = new MutationObserver(addCopyButtons);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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fix(runtime-host): restore desktop Computer Use capability#2233

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to your account

 Merged

M4n5ter
merged 2 commits into

from

Aug 5, 2026
 Merged


fix(runtime-host): restore desktop Computer Use capability
#2233
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bb9ed11

fix(runtime-host): restore desktop computer use capability


M4n5ter Aug 5, 2026
23d338b

fix(runtime): keep subagent admission rejections generic


M4n5ter Aug 5, 2026

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40 changes: 39 additions & 1 deletion
apps/desktop/src/main/__tests__/runtime-host-native-capabilities.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -1,6 +1,12 @@
import assert from 'node:assert/strict';
import test from 'node:test';
import type { ComputerUseToolSet, MakaTool, MakaToolContext } from '@maka/runtime';
import {
 buildComputerUseTools,
 type ComputerUseToolSet,
 type CuDispatchBackend,
 type MakaTool,
 type MakaToolContext,
} from '@maka/runtime';
import type { ClientCapabilityProvider } from '@maka/runtime-host/client';
import {
 decodeClientCapabilityReplaceInput,
Expand DownExpand Up@@ -54,6 +60,27 @@ test('publishes self-described session-affine Browser and Computer Use offers',
 );
});

test('publishes the real Computer Use schema through the Client Capability protocol', () => {
 const computerUseTools = buildComputerUseTools({ backend: computerBackend() });
 const provider = createDesktopNativeCapabilityProvider({
 browserTools: [],
 releaseBrowserSession() {},
 computerUseTools,
 releaseComputerUseSession: (sessionId) => computerUseTools.clearSession(sessionId),
 });

 assert.doesNotThrow(() =>
 decodeClientCapabilityReplaceInput({
 registrationId: 'registration-1',
 offers: provider.offers(),
 }),
 );
 const coordinateSchema = provider.offers()[0]?.tools[0]?.inputSchema.properties as
 | Record<string, { items?: unknown }>
 | undefined;
 assert.equal(Array.isArray(coordinateSchema?.coordinate?.items), true);
});

test('validates before admission and invokes the exact offered tool with Host context', async () => {
 let admitted = false;
 let invoked = false;
Expand DownExpand Up@@ -399,6 +426,17 @@ function computerTools(
 return tools;
}

function computerBackend(): CuDispatchBackend {
 return {
 async preflight() {
 return { accessibility: true, screenRecording: true };
 },
 async run() {
 return { outcome: { ok: true, tier: 'ax', verified: true } };
 },
 };
}

function capabilityFrame(overrides: Partial<ClientCapabilityCallFrame> = {}): ClientCapabilityCallFrame {
 return {
 kind: 'client.capability.call',
Expand Down

10 changes: 10 additions & 0 deletions
packages/computer-use/src/__tests__/maka-cu-backend.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -469,6 +469,16 @@ describe('maka-cu backend', () => {
 assert.deepEqual(received(records, 'permissions.check')[0], { prompt: false });
 });

 it('keeps routine preflight quiet and exposes an explicit Accessibility prompt request', async () => {
 const { backend, logPath } = makeBackend();

 await backend.preflight(signal());
 await backend.requestAccessibilityPermission(signal());

 const checks = received(await readRecords(logPath), 'permissions.check');
 assert.deepEqual(checks, [{ prompt: false }, { prompt: true }]);
 });

 it('fails loudly on a protocol version mismatch and does not retry', async () => {
 const { backend, logPath } = makeBackend({ protocol: 'maka.cu/99' });
 await assert.rejects(backend.preflight(signal()), /service_mismatch/);
Expand Down

9 changes: 8 additions & 1 deletion
packages/computer-use/src/maka-cu-backend.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -454,8 +454,9 @@ export interface MakaCuLaunchedApp {
 */
export type MakaCuBackend = Omit<
 CuDispatchBackend,
 'runSemantic' | 'observeApp' | 'captureObservation'
 'runSemantic' | 'observeApp' | 'captureObservation' | 'requestAccessibilityPermission'
> & {
 requestAccessibilityPermission(signal: AbortSignal): Promise<void>;
 observeApp(
 input: {
 app?: string;
Expand DownExpand Up@@ -2251,6 +2252,12 @@ export function createMakaCuBackend(opts: MakaCuBackendOptions): MakaCuBackend {
 });
 },

 async requestAccessibilityPermission(signal) {
 await withOperationQueue(signal, async () => {
 await service.call('permissions.check', { prompt: true }, signal);
 });
 },

 async listApps(signal) {
 return withOperationQueue(signal, async (): Promise<CuAppSummary[]> => {
 try {
Expand Down

45 changes: 45 additions & 0 deletions
packages/runtime-host/src/__tests__/client-capability-protocol.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -281,6 +281,51 @@ describe('Client Capability protocol', () => {
 ]),
 ),
 );
 assert.doesNotThrow(() =>
 decodeClientFrame(
 replaceFrame([
 {
 ...offer('tuple_schema', 'move'),
 tools: [
 {
 ...offer('tuple_schema', 'move').tools[0],
 inputSchema: {
 type: 'object',
 properties: {
 coordinate: {
 type: 'array',
 items: [{ type: 'integer' }, { type: 'integer' }],
 },
 },
 },
 },
 ],
 },
 ]),
 ),
 );
 for (const items of [[], [{ type: 'integer' }, 'not-a-schema']]) {
 assert.throws(
 () =>
 decodeClientFrame(
 replaceFrame([
 {
 ...offer('invalid_tuple_schema', 'move'),
 tools: [
 {
 ...offer('invalid_tuple_schema', 'move').tools[0],
 inputSchema: {
 type: 'object',
 properties: { coordinate: { type: 'array', items } },
 },
 },
 ],
 },
 ]),
 ),
 (error: unknown) => error instanceof RuntimeHostProtocolError,
 );
 }
 assert.throws(
 () =>
 decodeClientFrame({
Expand Down

18 changes: 16 additions & 2 deletions
packages/runtime-host/src/protocol/client-capability.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -66,6 +66,7 @@ export const CLIENT_CAPABILITY_MAX_RESULT_CHUNKS = Math.ceil(
const CLIENT_CAPABILITY_INLINE_RESULT_MAX_BYTES = 40 * 1024;
const CLIENT_CAPABILITY_JSON_MAX_DEPTH = 32;
const CLIENT_CAPABILITY_JSON_MAX_NODES = 8_192;
const CLIENT_CAPABILITY_TOOL_DESCRIPTION_MAX_CHARS = 8_192;
const CLIENT_CAPABILITY_ERRORS = [
 'host_not_ready',
 'host_draining',
Expand DownExpand Up@@ -590,7 +591,11 @@ function decodeToolDescriptor(value: unknown): ClientCapabilityToolDescriptor {
 ...(record.description === undefined
 ? {}
 : {
 description: requireString(record.description, 'description', 4_096),
 description: requireString(
 record.description,
 'description',
 CLIENT_CAPABILITY_TOOL_DESCRIPTION_MAX_CHARS,
 ),
 }),
 inputSchema,
 ...(record.annotations === undefined
Expand DownExpand Up@@ -721,7 +726,16 @@ function validateToolInputSchema(root: Record<string, unknown>): void {
 ) {
 visit(schema.additionalProperties);
 }
 if (schema.items !== undefined) visit(schema.items);
 if (schema.items !== undefined) {
 if (Array.isArray(schema.items)) {
 if (schema.items.length === 0) {
 throw invalidProtocolFrame('Invalid Client Capability tool schema items');
 }
 for (const nested of schema.items) visit(nested);
 } else {
 visit(schema.items);
 }
 }
 for (const key of ['allOf', 'anyOf', 'oneOf'] as const) {
 if (schema[key] === undefined) continue;
 if (!Array.isArray(schema[key]) || schema[key].length === 0) {
Expand Down

22 changes: 22 additions & 0 deletions
packages/runtime/src/__tests__/computer-use-tools.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -1791,6 +1791,28 @@ describe('buildComputerUseTools — the `maka_computer` MakaTool', () => {
 assert.match(r.text, /Accessibility/);
 });

 test('requests Accessibility once on first use while every action still preflights', async () => {
 let preflights = 0;
 let requests = 0;
 const backend = fakeBackend({ accessibility: false });
 backend.preflight = async () => {
 preflights += 1;
 return { accessibility: false, screenRecording: true };
 };
 backend.requestAccessibilityPermission = async () => {
 requests += 1;
 };
 const [tool] = buildComputerUseTools({ backend });

 const first = (await tool.impl({ action: 'wait' } as never, ctx())) as { text: string };
 const second = (await tool.impl({ action: 'wait' } as never, ctx())) as { text: string };

 assert.match(first.text, /permission_missing/);
 assert.match(second.text, /permission_missing/);
 assert.equal(preflights, 2);
 assert.equal(requests, 1);
 });

 test('S12: a capture action fails closed when Screen Recording is not granted', async () => {
 const backend = fakeBackend({ screenRecording: false });
 backend.observeApp = async () => observation();
Expand Down
Loading
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
(function() {
var style = document.createElement('style');
style.textContent = '
.markdown-body {
color-scheme: dark light;
}
.markdown-body pre { background: #161b22 !important; }
.markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }
.markdown-body table th, .markdown-body table td { border-color: #30363d !important; }
.markdown-body img { background: #0d1117; }
.markdown-body blockquote { border-left-color: #8b949e; }
.markdown-body hr { border-color: #30363d; }
';
document.head.appendChild(style);
})();
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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fix(runtime-host): restore desktop Computer Use capability#2233

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to your account

 Merged

M4n5ter
merged 2 commits into

from

Aug 5, 2026
 Merged


fix(runtime-host): restore desktop Computer Use capability
#2233
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bb9ed11

fix(runtime-host): restore desktop computer use capability


M4n5ter Aug 5, 2026
23d338b

fix(runtime): keep subagent admission rejections generic


M4n5ter Aug 5, 2026

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40 changes: 39 additions & 1 deletion
apps/desktop/src/main/__tests__/runtime-host-native-capabilities.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -1,6 +1,12 @@
import assert from 'node:assert/strict';
import test from 'node:test';
import type { ComputerUseToolSet, MakaTool, MakaToolContext } from '@maka/runtime';
import {
 buildComputerUseTools,
 type ComputerUseToolSet,
 type CuDispatchBackend,
 type MakaTool,
 type MakaToolContext,
} from '@maka/runtime';
import type { ClientCapabilityProvider } from '@maka/runtime-host/client';
import {
 decodeClientCapabilityReplaceInput,
Expand DownExpand Up@@ -54,6 +60,27 @@ test('publishes self-described session-affine Browser and Computer Use offers',
 );
});

test('publishes the real Computer Use schema through the Client Capability protocol', () => {
 const computerUseTools = buildComputerUseTools({ backend: computerBackend() });
 const provider = createDesktopNativeCapabilityProvider({
 browserTools: [],
 releaseBrowserSession() {},
 computerUseTools,
 releaseComputerUseSession: (sessionId) => computerUseTools.clearSession(sessionId),
 });

 assert.doesNotThrow(() =>
 decodeClientCapabilityReplaceInput({
 registrationId: 'registration-1',
 offers: provider.offers(),
 }),
 );
 const coordinateSchema = provider.offers()[0]?.tools[0]?.inputSchema.properties as
 | Record<string, { items?: unknown }>
 | undefined;
 assert.equal(Array.isArray(coordinateSchema?.coordinate?.items), true);
});

test('validates before admission and invokes the exact offered tool with Host context', async () => {
 let admitted = false;
 let invoked = false;
Expand DownExpand Up@@ -399,6 +426,17 @@ function computerTools(
 return tools;
}

function computerBackend(): CuDispatchBackend {
 return {
 async preflight() {
 return { accessibility: true, screenRecording: true };
 },
 async run() {
 return { outcome: { ok: true, tier: 'ax', verified: true } };
 },
 };
}

function capabilityFrame(overrides: Partial<ClientCapabilityCallFrame> = {}): ClientCapabilityCallFrame {
 return {
 kind: 'client.capability.call',
Expand Down

10 changes: 10 additions & 0 deletions
packages/computer-use/src/__tests__/maka-cu-backend.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -469,6 +469,16 @@ describe('maka-cu backend', () => {
 assert.deepEqual(received(records, 'permissions.check')[0], { prompt: false });
 });

 it('keeps routine preflight quiet and exposes an explicit Accessibility prompt request', async () => {
 const { backend, logPath } = makeBackend();

 await backend.preflight(signal());
 await backend.requestAccessibilityPermission(signal());

 const checks = received(await readRecords(logPath), 'permissions.check');
 assert.deepEqual(checks, [{ prompt: false }, { prompt: true }]);
 });

 it('fails loudly on a protocol version mismatch and does not retry', async () => {
 const { backend, logPath } = makeBackend({ protocol: 'maka.cu/99' });
 await assert.rejects(backend.preflight(signal()), /service_mismatch/);
Expand Down

9 changes: 8 additions & 1 deletion
packages/computer-use/src/maka-cu-backend.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -454,8 +454,9 @@ export interface MakaCuLaunchedApp {
 */
export type MakaCuBackend = Omit<
 CuDispatchBackend,
 'runSemantic' | 'observeApp' | 'captureObservation'
 'runSemantic' | 'observeApp' | 'captureObservation' | 'requestAccessibilityPermission'
> & {
 requestAccessibilityPermission(signal: AbortSignal): Promise<void>;
 observeApp(
 input: {
 app?: string;
Expand DownExpand Up@@ -2251,6 +2252,12 @@ export function createMakaCuBackend(opts: MakaCuBackendOptions): MakaCuBackend {
 });
 },

 async requestAccessibilityPermission(signal) {
 await withOperationQueue(signal, async () => {
 await service.call('permissions.check', { prompt: true }, signal);
 });
 },

 async listApps(signal) {
 return withOperationQueue(signal, async (): Promise<CuAppSummary[]> => {
 try {
Expand Down

45 changes: 45 additions & 0 deletions
packages/runtime-host/src/__tests__/client-capability-protocol.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -281,6 +281,51 @@ describe('Client Capability protocol', () => {
 ]),
 ),
 );
 assert.doesNotThrow(() =>
 decodeClientFrame(
 replaceFrame([
 {
 ...offer('tuple_schema', 'move'),
 tools: [
 {
 ...offer('tuple_schema', 'move').tools[0],
 inputSchema: {
 type: 'object',
 properties: {
 coordinate: {
 type: 'array',
 items: [{ type: 'integer' }, { type: 'integer' }],
 },
 },
 },
 },
 ],
 },
 ]),
 ),
 );
 for (const items of [[], [{ type: 'integer' }, 'not-a-schema']]) {
 assert.throws(
 () =>
 decodeClientFrame(
 replaceFrame([
 {
 ...offer('invalid_tuple_schema', 'move'),
 tools: [
 {
 ...offer('invalid_tuple_schema', 'move').tools[0],
 inputSchema: {
 type: 'object',
 properties: { coordinate: { type: 'array', items } },
 },
 },
 ],
 },
 ]),
 ),
 (error: unknown) => error instanceof RuntimeHostProtocolError,
 );
 }
 assert.throws(
 () =>
 decodeClientFrame({
Expand Down

18 changes: 16 additions & 2 deletions
packages/runtime-host/src/protocol/client-capability.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -66,6 +66,7 @@ export const CLIENT_CAPABILITY_MAX_RESULT_CHUNKS = Math.ceil(
const CLIENT_CAPABILITY_INLINE_RESULT_MAX_BYTES = 40 * 1024;
const CLIENT_CAPABILITY_JSON_MAX_DEPTH = 32;
const CLIENT_CAPABILITY_JSON_MAX_NODES = 8_192;
const CLIENT_CAPABILITY_TOOL_DESCRIPTION_MAX_CHARS = 8_192;
const CLIENT_CAPABILITY_ERRORS = [
 'host_not_ready',
 'host_draining',
Expand DownExpand Up@@ -590,7 +591,11 @@ function decodeToolDescriptor(value: unknown): ClientCapabilityToolDescriptor {
 ...(record.description === undefined
 ? {}
 : {
 description: requireString(record.description, 'description', 4_096),
 description: requireString(
 record.description,
 'description',
 CLIENT_CAPABILITY_TOOL_DESCRIPTION_MAX_CHARS,
 ),
 }),
 inputSchema,
 ...(record.annotations === undefined
Expand DownExpand Up@@ -721,7 +726,16 @@ function validateToolInputSchema(root: Record<string, unknown>): void {
 ) {
 visit(schema.additionalProperties);
 }
 if (schema.items !== undefined) visit(schema.items);
 if (schema.items !== undefined) {
 if (Array.isArray(schema.items)) {
 if (schema.items.length === 0) {
 throw invalidProtocolFrame('Invalid Client Capability tool schema items');
 }
 for (const nested of schema.items) visit(nested);
 } else {
 visit(schema.items);
 }
 }
 for (const key of ['allOf', 'anyOf', 'oneOf'] as const) {
 if (schema[key] === undefined) continue;
 if (!Array.isArray(schema[key]) || schema[key].length === 0) {
Expand Down

22 changes: 22 additions & 0 deletions
packages/runtime/src/__tests__/computer-use-tools.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -1791,6 +1791,28 @@ describe('buildComputerUseTools — the `maka_computer` MakaTool', () => {
 assert.match(r.text, /Accessibility/);
 });

 test('requests Accessibility once on first use while every action still preflights', async () => {
 let preflights = 0;
 let requests = 0;
 const backend = fakeBackend({ accessibility: false });
 backend.preflight = async () => {
 preflights += 1;
 return { accessibility: false, screenRecording: true };
 };
 backend.requestAccessibilityPermission = async () => {
 requests += 1;
 };
 const [tool] = buildComputerUseTools({ backend });

 const first = (await tool.impl({ action: 'wait' } as never, ctx())) as { text: string };
 const second = (await tool.impl({ action: 'wait' } as never, ctx())) as { text: string };

 assert.match(first.text, /permission_missing/);
 assert.match(second.text, /permission_missing/);
 assert.equal(preflights, 2);
 assert.equal(requests, 1);
 });

 test('S12: a capture action fails closed when Screen Recording is not granted', async () => {
 const backend = fakeBackend({ screenRecording: false });
 backend.observeApp = async () => observation();
Expand Down
Loading
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {
var url = new URL(ref);
var q = url.searchParams.get('q') || url.searchParams.get('p');
if (q) {
terms = q.split(/\s+/).filter(function(t) { return t.length > 2; });
}
}
if (terms.length === 0) return;
var style = document.createElement('style');
style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';
document.head.appendChild(style);
function highlight(node) {
if (node.nodeType === 3) { // text node
var text = node.textContent;
var found = false;
terms.forEach(function(term) {
var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi');
if (regex.test(text)) {
found = true;
var frag = document.createDocumentFragment();
var parts = text.split(regex);
parts.forEach(function(part, i) {
if (i % 2 === 0) {
frag.appendChild(document.createTextNode(part));
} else {
var span = document.createElement('span');
span.className = 'userscript-highlight';
span.textContent = part;
frag.appendChild(span);
}
});
node.parentNode.replaceChild(frag, node);
}
});
} else if (node.nodeType === 1 && node.childNodes) { // element
var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];
if (!skipTags.includes(node.tagName)) {
Array.from(node.childNodes).forEach(highlight);
}
}
}
highlight(document.body);
// Re-highlight on dynamic content
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1 || node.nodeType === 3) highlight(node);
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
fix(runtime-host): restore desktop Computer Use capability#2233

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M4n5ter
merged 2 commits into

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Aug 5, 2026
 Merged


fix(runtime-host): restore desktop Computer Use capability
#2233
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bb9ed11

fix(runtime-host): restore desktop computer use capability


M4n5ter Aug 5, 2026
23d338b

fix(runtime): keep subagent admission rejections generic


M4n5ter Aug 5, 2026

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40 changes: 39 additions & 1 deletion
apps/desktop/src/main/__tests__/runtime-host-native-capabilities.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -1,6 +1,12 @@
import assert from 'node:assert/strict';
import test from 'node:test';
import type { ComputerUseToolSet, MakaTool, MakaToolContext } from '@maka/runtime';
import {
 buildComputerUseTools,
 type ComputerUseToolSet,
 type CuDispatchBackend,
 type MakaTool,
 type MakaToolContext,
} from '@maka/runtime';
import type { ClientCapabilityProvider } from '@maka/runtime-host/client';
import {
 decodeClientCapabilityReplaceInput,
Expand DownExpand Up@@ -54,6 +60,27 @@ test('publishes self-described session-affine Browser and Computer Use offers',
 );
});

test('publishes the real Computer Use schema through the Client Capability protocol', () => {
 const computerUseTools = buildComputerUseTools({ backend: computerBackend() });
 const provider = createDesktopNativeCapabilityProvider({
 browserTools: [],
 releaseBrowserSession() {},
 computerUseTools,
 releaseComputerUseSession: (sessionId) => computerUseTools.clearSession(sessionId),
 });

 assert.doesNotThrow(() =>
 decodeClientCapabilityReplaceInput({
 registrationId: 'registration-1',
 offers: provider.offers(),
 }),
 );
 const coordinateSchema = provider.offers()[0]?.tools[0]?.inputSchema.properties as
 | Record<string, { items?: unknown }>
 | undefined;
 assert.equal(Array.isArray(coordinateSchema?.coordinate?.items), true);
});

test('validates before admission and invokes the exact offered tool with Host context', async () => {
 let admitted = false;
 let invoked = false;
Expand DownExpand Up@@ -399,6 +426,17 @@ function computerTools(
 return tools;
}

function computerBackend(): CuDispatchBackend {
 return {
 async preflight() {
 return { accessibility: true, screenRecording: true };
 },
 async run() {
 return { outcome: { ok: true, tier: 'ax', verified: true } };
 },
 };
}

function capabilityFrame(overrides: Partial<ClientCapabilityCallFrame> = {}): ClientCapabilityCallFrame {
 return {
 kind: 'client.capability.call',
Expand Down

10 changes: 10 additions & 0 deletions
packages/computer-use/src/__tests__/maka-cu-backend.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -469,6 +469,16 @@ describe('maka-cu backend', () => {
 assert.deepEqual(received(records, 'permissions.check')[0], { prompt: false });
 });

 it('keeps routine preflight quiet and exposes an explicit Accessibility prompt request', async () => {
 const { backend, logPath } = makeBackend();

 await backend.preflight(signal());
 await backend.requestAccessibilityPermission(signal());

 const checks = received(await readRecords(logPath), 'permissions.check');
 assert.deepEqual(checks, [{ prompt: false }, { prompt: true }]);
 });

 it('fails loudly on a protocol version mismatch and does not retry', async () => {
 const { backend, logPath } = makeBackend({ protocol: 'maka.cu/99' });
 await assert.rejects(backend.preflight(signal()), /service_mismatch/);
Expand Down

9 changes: 8 additions & 1 deletion
packages/computer-use/src/maka-cu-backend.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -454,8 +454,9 @@ export interface MakaCuLaunchedApp {
 */
export type MakaCuBackend = Omit<
 CuDispatchBackend,
 'runSemantic' | 'observeApp' | 'captureObservation'
 'runSemantic' | 'observeApp' | 'captureObservation' | 'requestAccessibilityPermission'
> & {
 requestAccessibilityPermission(signal: AbortSignal): Promise<void>;
 observeApp(
 input: {
 app?: string;
Expand DownExpand Up@@ -2251,6 +2252,12 @@ export function createMakaCuBackend(opts: MakaCuBackendOptions): MakaCuBackend {
 });
 },

 async requestAccessibilityPermission(signal) {
 await withOperationQueue(signal, async () => {
 await service.call('permissions.check', { prompt: true }, signal);
 });
 },

 async listApps(signal) {
 return withOperationQueue(signal, async (): Promise<CuAppSummary[]> => {
 try {
Expand Down

45 changes: 45 additions & 0 deletions
packages/runtime-host/src/__tests__/client-capability-protocol.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -281,6 +281,51 @@ describe('Client Capability protocol', () => {
 ]),
 ),
 );
 assert.doesNotThrow(() =>
 decodeClientFrame(
 replaceFrame([
 {
 ...offer('tuple_schema', 'move'),
 tools: [
 {
 ...offer('tuple_schema', 'move').tools[0],
 inputSchema: {
 type: 'object',
 properties: {
 coordinate: {
 type: 'array',
 items: [{ type: 'integer' }, { type: 'integer' }],
 },
 },
 },
 },
 ],
 },
 ]),
 ),
 );
 for (const items of [[], [{ type: 'integer' }, 'not-a-schema']]) {
 assert.throws(
 () =>
 decodeClientFrame(
 replaceFrame([
 {
 ...offer('invalid_tuple_schema', 'move'),
 tools: [
 {
 ...offer('invalid_tuple_schema', 'move').tools[0],
 inputSchema: {
 type: 'object',
 properties: { coordinate: { type: 'array', items } },
 },
 },
 ],
 },
 ]),
 ),
 (error: unknown) => error instanceof RuntimeHostProtocolError,
 );
 }
 assert.throws(
 () =>
 decodeClientFrame({
Expand Down

18 changes: 16 additions & 2 deletions
packages/runtime-host/src/protocol/client-capability.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -66,6 +66,7 @@ export const CLIENT_CAPABILITY_MAX_RESULT_CHUNKS = Math.ceil(
const CLIENT_CAPABILITY_INLINE_RESULT_MAX_BYTES = 40 * 1024;
const CLIENT_CAPABILITY_JSON_MAX_DEPTH = 32;
const CLIENT_CAPABILITY_JSON_MAX_NODES = 8_192;
const CLIENT_CAPABILITY_TOOL_DESCRIPTION_MAX_CHARS = 8_192;
const CLIENT_CAPABILITY_ERRORS = [
 'host_not_ready',
 'host_draining',
Expand DownExpand Up@@ -590,7 +591,11 @@ function decodeToolDescriptor(value: unknown): ClientCapabilityToolDescriptor {
 ...(record.description === undefined
 ? {}
 : {
 description: requireString(record.description, 'description', 4_096),
 description: requireString(
 record.description,
 'description',
 CLIENT_CAPABILITY_TOOL_DESCRIPTION_MAX_CHARS,
 ),
 }),
 inputSchema,
 ...(record.annotations === undefined
Expand DownExpand Up@@ -721,7 +726,16 @@ function validateToolInputSchema(root: Record<string, unknown>): void {
 ) {
 visit(schema.additionalProperties);
 }
 if (schema.items !== undefined) visit(schema.items);
 if (schema.items !== undefined) {
 if (Array.isArray(schema.items)) {
 if (schema.items.length === 0) {
 throw invalidProtocolFrame('Invalid Client Capability tool schema items');
 }
 for (const nested of schema.items) visit(nested);
 } else {
 visit(schema.items);
 }
 }
 for (const key of ['allOf', 'anyOf', 'oneOf'] as const) {
 if (schema[key] === undefined) continue;
 if (!Array.isArray(schema[key]) || schema[key].length === 0) {
Expand Down

22 changes: 22 additions & 0 deletions
packages/runtime/src/__tests__/computer-use-tools.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -1791,6 +1791,28 @@ describe('buildComputerUseTools — the `maka_computer` MakaTool', () => {
 assert.match(r.text, /Accessibility/);
 });

 test('requests Accessibility once on first use while every action still preflights', async () => {
 let preflights = 0;
 let requests = 0;
 const backend = fakeBackend({ accessibility: false });
 backend.preflight = async () => {
 preflights += 1;
 return { accessibility: false, screenRecording: true };
 };
 backend.requestAccessibilityPermission = async () => {
 requests += 1;
 };
 const [tool] = buildComputerUseTools({ backend });

 const first = (await tool.impl({ action: 'wait' } as never, ctx())) as { text: string };
 const second = (await tool.impl({ action: 'wait' } as never, ctx())) as { text: string };

 assert.match(first.text, /permission_missing/);
 assert.match(second.text, /permission_missing/);
 assert.equal(preflights, 2);
 assert.equal(requests, 1);
 });

 test('S12: a capture action fails closed when Screen Recording is not granted', async () => {
 const backend = fakeBackend({ screenRecording: false });
 backend.observeApp = async () => observation();
Expand Down
Loading
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
fix(runtime-host): restore desktop Computer Use capability#2233

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to your account

 Merged

M4n5ter
merged 2 commits into

from

Aug 5, 2026
 Merged


fix(runtime-host): restore desktop Computer Use capability
#2233
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bb9ed11

fix(runtime-host): restore desktop computer use capability


M4n5ter Aug 5, 2026
23d338b

fix(runtime): keep subagent admission rejections generic


M4n5ter Aug 5, 2026

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40 changes: 39 additions & 1 deletion
apps/desktop/src/main/__tests__/runtime-host-native-capabilities.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -1,6 +1,12 @@
import assert from 'node:assert/strict';
import test from 'node:test';
import type { ComputerUseToolSet, MakaTool, MakaToolContext } from '@maka/runtime';
import {
 buildComputerUseTools,
 type ComputerUseToolSet,
 type CuDispatchBackend,
 type MakaTool,
 type MakaToolContext,
} from '@maka/runtime';
import type { ClientCapabilityProvider } from '@maka/runtime-host/client';
import {
 decodeClientCapabilityReplaceInput,
Expand DownExpand Up@@ -54,6 +60,27 @@ test('publishes self-described session-affine Browser and Computer Use offers',
 );
});

test('publishes the real Computer Use schema through the Client Capability protocol', () => {
 const computerUseTools = buildComputerUseTools({ backend: computerBackend() });
 const provider = createDesktopNativeCapabilityProvider({
 browserTools: [],
 releaseBrowserSession() {},
 computerUseTools,
 releaseComputerUseSession: (sessionId) => computerUseTools.clearSession(sessionId),
 });

 assert.doesNotThrow(() =>
 decodeClientCapabilityReplaceInput({
 registrationId: 'registration-1',
 offers: provider.offers(),
 }),
 );
 const coordinateSchema = provider.offers()[0]?.tools[0]?.inputSchema.properties as
 | Record<string, { items?: unknown }>
 | undefined;
 assert.equal(Array.isArray(coordinateSchema?.coordinate?.items), true);
});

test('validates before admission and invokes the exact offered tool with Host context', async () => {
 let admitted = false;
 let invoked = false;
Expand DownExpand Up@@ -399,6 +426,17 @@ function computerTools(
 return tools;
}

function computerBackend(): CuDispatchBackend {
 return {
 async preflight() {
 return { accessibility: true, screenRecording: true };
 },
 async run() {
 return { outcome: { ok: true, tier: 'ax', verified: true } };
 },
 };
}

function capabilityFrame(overrides: Partial<ClientCapabilityCallFrame> = {}): ClientCapabilityCallFrame {
 return {
 kind: 'client.capability.call',
Expand Down

10 changes: 10 additions & 0 deletions
packages/computer-use/src/__tests__/maka-cu-backend.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -469,6 +469,16 @@ describe('maka-cu backend', () => {
 assert.deepEqual(received(records, 'permissions.check')[0], { prompt: false });
 });

 it('keeps routine preflight quiet and exposes an explicit Accessibility prompt request', async () => {
 const { backend, logPath } = makeBackend();

 await backend.preflight(signal());
 await backend.requestAccessibilityPermission(signal());

 const checks = received(await readRecords(logPath), 'permissions.check');
 assert.deepEqual(checks, [{ prompt: false }, { prompt: true }]);
 });

 it('fails loudly on a protocol version mismatch and does not retry', async () => {
 const { backend, logPath } = makeBackend({ protocol: 'maka.cu/99' });
 await assert.rejects(backend.preflight(signal()), /service_mismatch/);
Expand Down

9 changes: 8 additions & 1 deletion
packages/computer-use/src/maka-cu-backend.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -454,8 +454,9 @@ export interface MakaCuLaunchedApp {
 */
export type MakaCuBackend = Omit<
 CuDispatchBackend,
 'runSemantic' | 'observeApp' | 'captureObservation'
 'runSemantic' | 'observeApp' | 'captureObservation' | 'requestAccessibilityPermission'
> & {
 requestAccessibilityPermission(signal: AbortSignal): Promise<void>;
 observeApp(
 input: {
 app?: string;
Expand DownExpand Up@@ -2251,6 +2252,12 @@ export function createMakaCuBackend(opts: MakaCuBackendOptions): MakaCuBackend {
 });
 },

 async requestAccessibilityPermission(signal) {
 await withOperationQueue(signal, async () => {
 await service.call('permissions.check', { prompt: true }, signal);
 });
 },

 async listApps(signal) {
 return withOperationQueue(signal, async (): Promise<CuAppSummary[]> => {
 try {
Expand Down

45 changes: 45 additions & 0 deletions
packages/runtime-host/src/__tests__/client-capability-protocol.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -281,6 +281,51 @@ describe('Client Capability protocol', () => {
 ]),
 ),
 );
 assert.doesNotThrow(() =>
 decodeClientFrame(
 replaceFrame([
 {
 ...offer('tuple_schema', 'move'),
 tools: [
 {
 ...offer('tuple_schema', 'move').tools[0],
 inputSchema: {
 type: 'object',
 properties: {
 coordinate: {
 type: 'array',
 items: [{ type: 'integer' }, { type: 'integer' }],
 },
 },
 },
 },
 ],
 },
 ]),
 ),
 );
 for (const items of [[], [{ type: 'integer' }, 'not-a-schema']]) {
 assert.throws(
 () =>
 decodeClientFrame(
 replaceFrame([
 {
 ...offer('invalid_tuple_schema', 'move'),
 tools: [
 {
 ...offer('invalid_tuple_schema', 'move').tools[0],
 inputSchema: {
 type: 'object',
 properties: { coordinate: { type: 'array', items } },
 },
 },
 ],
 },
 ]),
 ),
 (error: unknown) => error instanceof RuntimeHostProtocolError,
 );
 }
 assert.throws(
 () =>
 decodeClientFrame({
Expand Down

18 changes: 16 additions & 2 deletions
packages/runtime-host/src/protocol/client-capability.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -66,6 +66,7 @@ export const CLIENT_CAPABILITY_MAX_RESULT_CHUNKS = Math.ceil(
const CLIENT_CAPABILITY_INLINE_RESULT_MAX_BYTES = 40 * 1024;
const CLIENT_CAPABILITY_JSON_MAX_DEPTH = 32;
const CLIENT_CAPABILITY_JSON_MAX_NODES = 8_192;
const CLIENT_CAPABILITY_TOOL_DESCRIPTION_MAX_CHARS = 8_192;
const CLIENT_CAPABILITY_ERRORS = [
 'host_not_ready',
 'host_draining',
Expand DownExpand Up@@ -590,7 +591,11 @@ function decodeToolDescriptor(value: unknown): ClientCapabilityToolDescriptor {
 ...(record.description === undefined
 ? {}
 : {
 description: requireString(record.description, 'description', 4_096),
 description: requireString(
 record.description,
 'description',
 CLIENT_CAPABILITY_TOOL_DESCRIPTION_MAX_CHARS,
 ),
 }),
 inputSchema,
 ...(record.annotations === undefined
Expand DownExpand Up@@ -721,7 +726,16 @@ function validateToolInputSchema(root: Record<string, unknown>): void {
 ) {
 visit(schema.additionalProperties);
 }
 if (schema.items !== undefined) visit(schema.items);
 if (schema.items !== undefined) {
 if (Array.isArray(schema.items)) {
 if (schema.items.length === 0) {
 throw invalidProtocolFrame('Invalid Client Capability tool schema items');
 }
 for (const nested of schema.items) visit(nested);
 } else {
 visit(schema.items);
 }
 }
 for (const key of ['allOf', 'anyOf', 'oneOf'] as const) {
 if (schema[key] === undefined) continue;
 if (!Array.isArray(schema[key]) || schema[key].length === 0) {
Expand Down

22 changes: 22 additions & 0 deletions
packages/runtime/src/__tests__/computer-use-tools.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -1791,6 +1791,28 @@ describe('buildComputerUseTools — the `maka_computer` MakaTool', () => {
 assert.match(r.text, /Accessibility/);
 });

 test('requests Accessibility once on first use while every action still preflights', async () => {
 let preflights = 0;
 let requests = 0;
 const backend = fakeBackend({ accessibility: false });
 backend.preflight = async () => {
 preflights += 1;
 return { accessibility: false, screenRecording: true };
 };
 backend.requestAccessibilityPermission = async () => {
 requests += 1;
 };
 const [tool] = buildComputerUseTools({ backend });

 const first = (await tool.impl({ action: 'wait' } as never, ctx())) as { text: string };
 const second = (await tool.impl({ action: 'wait' } as never, ctx())) as { text: string };

 assert.match(first.text, /permission_missing/);
 assert.match(second.text, /permission_missing/);
 assert.equal(preflights, 2);
 assert.equal(requests, 1);
 });

 test('S12: a capture action fails closed when Screen Recording is not granted', async () => {
 const backend = fakeBackend({ screenRecording: false });
 backend.observeApp = async () => observation();
Expand Down
Loading
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
fix(runtime-host): restore desktop Computer Use capability#2233

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M4n5ter
merged 2 commits into

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Aug 5, 2026
 Merged


fix(runtime-host): restore desktop Computer Use capability
#2233
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bb9ed11

fix(runtime-host): restore desktop computer use capability


M4n5ter Aug 5, 2026
23d338b

fix(runtime): keep subagent admission rejections generic


M4n5ter Aug 5, 2026

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40 changes: 39 additions & 1 deletion
apps/desktop/src/main/__tests__/runtime-host-native-capabilities.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -1,6 +1,12 @@
import assert from 'node:assert/strict';
import test from 'node:test';
import type { ComputerUseToolSet, MakaTool, MakaToolContext } from '@maka/runtime';
import {
 buildComputerUseTools,
 type ComputerUseToolSet,
 type CuDispatchBackend,
 type MakaTool,
 type MakaToolContext,
} from '@maka/runtime';
import type { ClientCapabilityProvider } from '@maka/runtime-host/client';
import {
 decodeClientCapabilityReplaceInput,
Expand DownExpand Up@@ -54,6 +60,27 @@ test('publishes self-described session-affine Browser and Computer Use offers',
 );
});

test('publishes the real Computer Use schema through the Client Capability protocol', () => {
 const computerUseTools = buildComputerUseTools({ backend: computerBackend() });
 const provider = createDesktopNativeCapabilityProvider({
 browserTools: [],
 releaseBrowserSession() {},
 computerUseTools,
 releaseComputerUseSession: (sessionId) => computerUseTools.clearSession(sessionId),
 });

 assert.doesNotThrow(() =>
 decodeClientCapabilityReplaceInput({
 registrationId: 'registration-1',
 offers: provider.offers(),
 }),
 );
 const coordinateSchema = provider.offers()[0]?.tools[0]?.inputSchema.properties as
 | Record<string, { items?: unknown }>
 | undefined;
 assert.equal(Array.isArray(coordinateSchema?.coordinate?.items), true);
});

test('validates before admission and invokes the exact offered tool with Host context', async () => {
 let admitted = false;
 let invoked = false;
Expand DownExpand Up@@ -399,6 +426,17 @@ function computerTools(
 return tools;
}

function computerBackend(): CuDispatchBackend {
 return {
 async preflight() {
 return { accessibility: true, screenRecording: true };
 },
 async run() {
 return { outcome: { ok: true, tier: 'ax', verified: true } };
 },
 };
}

function capabilityFrame(overrides: Partial<ClientCapabilityCallFrame> = {}): ClientCapabilityCallFrame {
 return {
 kind: 'client.capability.call',
Expand Down

10 changes: 10 additions & 0 deletions
packages/computer-use/src/__tests__/maka-cu-backend.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -469,6 +469,16 @@ describe('maka-cu backend', () => {
 assert.deepEqual(received(records, 'permissions.check')[0], { prompt: false });
 });

 it('keeps routine preflight quiet and exposes an explicit Accessibility prompt request', async () => {
 const { backend, logPath } = makeBackend();

 await backend.preflight(signal());
 await backend.requestAccessibilityPermission(signal());

 const checks = received(await readRecords(logPath), 'permissions.check');
 assert.deepEqual(checks, [{ prompt: false }, { prompt: true }]);
 });

 it('fails loudly on a protocol version mismatch and does not retry', async () => {
 const { backend, logPath } = makeBackend({ protocol: 'maka.cu/99' });
 await assert.rejects(backend.preflight(signal()), /service_mismatch/);
Expand Down

9 changes: 8 additions & 1 deletion
packages/computer-use/src/maka-cu-backend.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -454,8 +454,9 @@ export interface MakaCuLaunchedApp {
 */
export type MakaCuBackend = Omit<
 CuDispatchBackend,
 'runSemantic' | 'observeApp' | 'captureObservation'
 'runSemantic' | 'observeApp' | 'captureObservation' | 'requestAccessibilityPermission'
> & {
 requestAccessibilityPermission(signal: AbortSignal): Promise<void>;
 observeApp(
 input: {
 app?: string;
Expand DownExpand Up@@ -2251,6 +2252,12 @@ export function createMakaCuBackend(opts: MakaCuBackendOptions): MakaCuBackend {
 });
 },

 async requestAccessibilityPermission(signal) {
 await withOperationQueue(signal, async () => {
 await service.call('permissions.check', { prompt: true }, signal);
 });
 },

 async listApps(signal) {
 return withOperationQueue(signal, async (): Promise<CuAppSummary[]> => {
 try {
Expand Down

45 changes: 45 additions & 0 deletions
packages/runtime-host/src/__tests__/client-capability-protocol.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -281,6 +281,51 @@ describe('Client Capability protocol', () => {
 ]),
 ),
 );
 assert.doesNotThrow(() =>
 decodeClientFrame(
 replaceFrame([
 {
 ...offer('tuple_schema', 'move'),
 tools: [
 {
 ...offer('tuple_schema', 'move').tools[0],
 inputSchema: {
 type: 'object',
 properties: {
 coordinate: {
 type: 'array',
 items: [{ type: 'integer' }, { type: 'integer' }],
 },
 },
 },
 },
 ],
 },
 ]),
 ),
 );
 for (const items of [[], [{ type: 'integer' }, 'not-a-schema']]) {
 assert.throws(
 () =>
 decodeClientFrame(
 replaceFrame([
 {
 ...offer('invalid_tuple_schema', 'move'),
 tools: [
 {
 ...offer('invalid_tuple_schema', 'move').tools[0],
 inputSchema: {
 type: 'object',
 properties: { coordinate: { type: 'array', items } },
 },
 },
 ],
 },
 ]),
 ),
 (error: unknown) => error instanceof RuntimeHostProtocolError,
 );
 }
 assert.throws(
 () =>
 decodeClientFrame({
Expand Down

18 changes: 16 additions & 2 deletions
packages/runtime-host/src/protocol/client-capability.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -66,6 +66,7 @@ export const CLIENT_CAPABILITY_MAX_RESULT_CHUNKS = Math.ceil(
const CLIENT_CAPABILITY_INLINE_RESULT_MAX_BYTES = 40 * 1024;
const CLIENT_CAPABILITY_JSON_MAX_DEPTH = 32;
const CLIENT_CAPABILITY_JSON_MAX_NODES = 8_192;
const CLIENT_CAPABILITY_TOOL_DESCRIPTION_MAX_CHARS = 8_192;
const CLIENT_CAPABILITY_ERRORS = [
 'host_not_ready',
 'host_draining',
Expand DownExpand Up@@ -590,7 +591,11 @@ function decodeToolDescriptor(value: unknown): ClientCapabilityToolDescriptor {
 ...(record.description === undefined
 ? {}
 : {
 description: requireString(record.description, 'description', 4_096),
 description: requireString(
 record.description,
 'description',
 CLIENT_CAPABILITY_TOOL_DESCRIPTION_MAX_CHARS,
 ),
 }),
 inputSchema,
 ...(record.annotations === undefined
Expand DownExpand Up@@ -721,7 +726,16 @@ function validateToolInputSchema(root: Record<string, unknown>): void {
 ) {
 visit(schema.additionalProperties);
 }
 if (schema.items !== undefined) visit(schema.items);
 if (schema.items !== undefined) {
 if (Array.isArray(schema.items)) {
 if (schema.items.length === 0) {
 throw invalidProtocolFrame('Invalid Client Capability tool schema items');
 }
 for (const nested of schema.items) visit(nested);
 } else {
 visit(schema.items);
 }
 }
 for (const key of ['allOf', 'anyOf', 'oneOf'] as const) {
 if (schema[key] === undefined) continue;
 if (!Array.isArray(schema[key]) || schema[key].length === 0) {
Expand Down

22 changes: 22 additions & 0 deletions
packages/runtime/src/__tests__/computer-use-tools.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -1791,6 +1791,28 @@ describe('buildComputerUseTools — the `maka_computer` MakaTool', () => {
 assert.match(r.text, /Accessibility/);
 });

 test('requests Accessibility once on first use while every action still preflights', async () => {
 let preflights = 0;
 let requests = 0;
 const backend = fakeBackend({ accessibility: false });
 backend.preflight = async () => {
 preflights += 1;
 return { accessibility: false, screenRecording: true };
 };
 backend.requestAccessibilityPermission = async () => {
 requests += 1;
 };
 const [tool] = buildComputerUseTools({ backend });

 const first = (await tool.impl({ action: 'wait' } as never, ctx())) as { text: string };
 const second = (await tool.impl({ action: 'wait' } as never, ctx())) as { text: string };

 assert.match(first.text, /permission_missing/);
 assert.match(second.text, /permission_missing/);
 assert.equal(preflights, 2);
 assert.equal(requests, 1);
 });

 test('S12: a capture action fails closed when Screen Recording is not granted', async () => {
 const backend = fakeBackend({ screenRecording: false });
 backend.observeApp = async () => observation();
Expand Down
Loading
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
fix(runtime-host): restore desktop Computer Use capability#2233

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to your account

 Merged

M4n5ter
merged 2 commits into

from

Aug 5, 2026
 Merged


fix(runtime-host): restore desktop Computer Use capability
#2233
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bb9ed11

fix(runtime-host): restore desktop computer use capability


M4n5ter Aug 5, 2026
23d338b

fix(runtime): keep subagent admission rejections generic


M4n5ter Aug 5, 2026

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40 changes: 39 additions & 1 deletion
apps/desktop/src/main/__tests__/runtime-host-native-capabilities.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -1,6 +1,12 @@
import assert from 'node:assert/strict';
import test from 'node:test';
import type { ComputerUseToolSet, MakaTool, MakaToolContext } from '@maka/runtime';
import {
 buildComputerUseTools,
 type ComputerUseToolSet,
 type CuDispatchBackend,
 type MakaTool,
 type MakaToolContext,
} from '@maka/runtime';
import type { ClientCapabilityProvider } from '@maka/runtime-host/client';
import {
 decodeClientCapabilityReplaceInput,
Expand DownExpand Up@@ -54,6 +60,27 @@ test('publishes self-described session-affine Browser and Computer Use offers',
 );
});

test('publishes the real Computer Use schema through the Client Capability protocol', () => {
 const computerUseTools = buildComputerUseTools({ backend: computerBackend() });
 const provider = createDesktopNativeCapabilityProvider({
 browserTools: [],
 releaseBrowserSession() {},
 computerUseTools,
 releaseComputerUseSession: (sessionId) => computerUseTools.clearSession(sessionId),
 });

 assert.doesNotThrow(() =>
 decodeClientCapabilityReplaceInput({
 registrationId: 'registration-1',
 offers: provider.offers(),
 }),
 );
 const coordinateSchema = provider.offers()[0]?.tools[0]?.inputSchema.properties as
 | Record<string, { items?: unknown }>
 | undefined;
 assert.equal(Array.isArray(coordinateSchema?.coordinate?.items), true);
});

test('validates before admission and invokes the exact offered tool with Host context', async () => {
 let admitted = false;
 let invoked = false;
Expand DownExpand Up@@ -399,6 +426,17 @@ function computerTools(
 return tools;
}

function computerBackend(): CuDispatchBackend {
 return {
 async preflight() {
 return { accessibility: true, screenRecording: true };
 },
 async run() {
 return { outcome: { ok: true, tier: 'ax', verified: true } };
 },
 };
}

function capabilityFrame(overrides: Partial<ClientCapabilityCallFrame> = {}): ClientCapabilityCallFrame {
 return {
 kind: 'client.capability.call',
Expand Down

10 changes: 10 additions & 0 deletions
packages/computer-use/src/__tests__/maka-cu-backend.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -469,6 +469,16 @@ describe('maka-cu backend', () => {
 assert.deepEqual(received(records, 'permissions.check')[0], { prompt: false });
 });

 it('keeps routine preflight quiet and exposes an explicit Accessibility prompt request', async () => {
 const { backend, logPath } = makeBackend();

 await backend.preflight(signal());
 await backend.requestAccessibilityPermission(signal());

 const checks = received(await readRecords(logPath), 'permissions.check');
 assert.deepEqual(checks, [{ prompt: false }, { prompt: true }]);
 });

 it('fails loudly on a protocol version mismatch and does not retry', async () => {
 const { backend, logPath } = makeBackend({ protocol: 'maka.cu/99' });
 await assert.rejects(backend.preflight(signal()), /service_mismatch/);
Expand Down

9 changes: 8 additions & 1 deletion
packages/computer-use/src/maka-cu-backend.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -454,8 +454,9 @@ export interface MakaCuLaunchedApp {
 */
export type MakaCuBackend = Omit<
 CuDispatchBackend,
 'runSemantic' | 'observeApp' | 'captureObservation'
 'runSemantic' | 'observeApp' | 'captureObservation' | 'requestAccessibilityPermission'
> & {
 requestAccessibilityPermission(signal: AbortSignal): Promise<void>;
 observeApp(
 input: {
 app?: string;
Expand DownExpand Up@@ -2251,6 +2252,12 @@ export function createMakaCuBackend(opts: MakaCuBackendOptions): MakaCuBackend {
 });
 },

 async requestAccessibilityPermission(signal) {
 await withOperationQueue(signal, async () => {
 await service.call('permissions.check', { prompt: true }, signal);
 });
 },

 async listApps(signal) {
 return withOperationQueue(signal, async (): Promise<CuAppSummary[]> => {
 try {
Expand Down

45 changes: 45 additions & 0 deletions
packages/runtime-host/src/__tests__/client-capability-protocol.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -281,6 +281,51 @@ describe('Client Capability protocol', () => {
 ]),
 ),
 );
 assert.doesNotThrow(() =>
 decodeClientFrame(
 replaceFrame([
 {
 ...offer('tuple_schema', 'move'),
 tools: [
 {
 ...offer('tuple_schema', 'move').tools[0],
 inputSchema: {
 type: 'object',
 properties: {
 coordinate: {
 type: 'array',
 items: [{ type: 'integer' }, { type: 'integer' }],
 },
 },
 },
 },
 ],
 },
 ]),
 ),
 );
 for (const items of [[], [{ type: 'integer' }, 'not-a-schema']]) {
 assert.throws(
 () =>
 decodeClientFrame(
 replaceFrame([
 {
 ...offer('invalid_tuple_schema', 'move'),
 tools: [
 {
 ...offer('invalid_tuple_schema', 'move').tools[0],
 inputSchema: {
 type: 'object',
 properties: { coordinate: { type: 'array', items } },
 },
 },
 ],
 },
 ]),
 ),
 (error: unknown) => error instanceof RuntimeHostProtocolError,
 );
 }
 assert.throws(
 () =>
 decodeClientFrame({
Expand Down

18 changes: 16 additions & 2 deletions
packages/runtime-host/src/protocol/client-capability.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -66,6 +66,7 @@ export const CLIENT_CAPABILITY_MAX_RESULT_CHUNKS = Math.ceil(
const CLIENT_CAPABILITY_INLINE_RESULT_MAX_BYTES = 40 * 1024;
const CLIENT_CAPABILITY_JSON_MAX_DEPTH = 32;
const CLIENT_CAPABILITY_JSON_MAX_NODES = 8_192;
const CLIENT_CAPABILITY_TOOL_DESCRIPTION_MAX_CHARS = 8_192;
const CLIENT_CAPABILITY_ERRORS = [
 'host_not_ready',
 'host_draining',
Expand DownExpand Up@@ -590,7 +591,11 @@ function decodeToolDescriptor(value: unknown): ClientCapabilityToolDescriptor {
 ...(record.description === undefined
 ? {}
 : {
 description: requireString(record.description, 'description', 4_096),
 description: requireString(
 record.description,
 'description',
 CLIENT_CAPABILITY_TOOL_DESCRIPTION_MAX_CHARS,
 ),
 }),
 inputSchema,
 ...(record.annotations === undefined
Expand DownExpand Up@@ -721,7 +726,16 @@ function validateToolInputSchema(root: Record<string, unknown>): void {
 ) {
 visit(schema.additionalProperties);
 }
 if (schema.items !== undefined) visit(schema.items);
 if (schema.items !== undefined) {
 if (Array.isArray(schema.items)) {
 if (schema.items.length === 0) {
 throw invalidProtocolFrame('Invalid Client Capability tool schema items');
 }
 for (const nested of schema.items) visit(nested);
 } else {
 visit(schema.items);
 }
 }
 for (const key of ['allOf', 'anyOf', 'oneOf'] as const) {
 if (schema[key] === undefined) continue;
 if (!Array.isArray(schema[key]) || schema[key].length === 0) {
Expand Down

22 changes: 22 additions & 0 deletions
packages/runtime/src/__tests__/computer-use-tools.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -1791,6 +1791,28 @@ describe('buildComputerUseTools — the `maka_computer` MakaTool', () => {
 assert.match(r.text, /Accessibility/);
 });

 test('requests Accessibility once on first use while every action still preflights', async () => {
 let preflights = 0;
 let requests = 0;
 const backend = fakeBackend({ accessibility: false });
 backend.preflight = async () => {
 preflights += 1;
 return { accessibility: false, screenRecording: true };
 };
 backend.requestAccessibilityPermission = async () => {
 requests += 1;
 };
 const [tool] = buildComputerUseTools({ backend });

 const first = (await tool.impl({ action: 'wait' } as never, ctx())) as { text: string };
 const second = (await tool.impl({ action: 'wait' } as never, ctx())) as { text: string };

 assert.match(first.text, /permission_missing/);
 assert.match(second.text, /permission_missing/);
 assert.equal(preflights, 2);
 assert.equal(requests, 1);
 });

 test('S12: a capture action fails closed when Screen Recording is not granted', async () => {
 const backend = fakeBackend({ screenRecording: false });
 backend.observeApp = async () => observation();
Expand Down
Loading
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
var style = document.getElementById('universal-dark-mode-style');
if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
style.textContent = '
/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
.no-dark-mode, .no-dark-mode *,
[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
}
// Toggle with Alt+Shift+D
document.addEventListener('keydown', function(e) {
if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
if (enabled) {
applyDarkMode();
console.log('[Universal Dark Mode] Enabled');
} else {
removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
}
}
});
// Apply on load
applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

Skip to content
fix(runtime-host): restore desktop Computer Use capability#2233

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privacy statement. We’ll occasionally send you account related emails.

Already on GitHub?
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 Merged

M4n5ter
merged 2 commits into

from

Aug 5, 2026
 Merged


fix(runtime-host): restore desktop Computer Use capability
#2233
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bb9ed11

fix(runtime-host): restore desktop computer use capability


M4n5ter Aug 5, 2026
23d338b

fix(runtime): keep subagent admission rejections generic


M4n5ter Aug 5, 2026

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40 changes: 39 additions & 1 deletion
apps/desktop/src/main/__tests__/runtime-host-native-capabilities.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -1,6 +1,12 @@
import assert from 'node:assert/strict';
import test from 'node:test';
import type { ComputerUseToolSet, MakaTool, MakaToolContext } from '@maka/runtime';
import {
 buildComputerUseTools,
 type ComputerUseToolSet,
 type CuDispatchBackend,
 type MakaTool,
 type MakaToolContext,
} from '@maka/runtime';
import type { ClientCapabilityProvider } from '@maka/runtime-host/client';
import {
 decodeClientCapabilityReplaceInput,
Expand DownExpand Up@@ -54,6 +60,27 @@ test('publishes self-described session-affine Browser and Computer Use offers',
 );
});

test('publishes the real Computer Use schema through the Client Capability protocol', () => {
 const computerUseTools = buildComputerUseTools({ backend: computerBackend() });
 const provider = createDesktopNativeCapabilityProvider({
 browserTools: [],
 releaseBrowserSession() {},
 computerUseTools,
 releaseComputerUseSession: (sessionId) => computerUseTools.clearSession(sessionId),
 });

 assert.doesNotThrow(() =>
 decodeClientCapabilityReplaceInput({
 registrationId: 'registration-1',
 offers: provider.offers(),
 }),
 );
 const coordinateSchema = provider.offers()[0]?.tools[0]?.inputSchema.properties as
 | Record<string, { items?: unknown }>
 | undefined;
 assert.equal(Array.isArray(coordinateSchema?.coordinate?.items), true);
});

test('validates before admission and invokes the exact offered tool with Host context', async () => {
 let admitted = false;
 let invoked = false;
Expand DownExpand Up@@ -399,6 +426,17 @@ function computerTools(
 return tools;
}

function computerBackend(): CuDispatchBackend {
 return {
 async preflight() {
 return { accessibility: true, screenRecording: true };
 },
 async run() {
 return { outcome: { ok: true, tier: 'ax', verified: true } };
 },
 };
}

function capabilityFrame(overrides: Partial<ClientCapabilityCallFrame> = {}): ClientCapabilityCallFrame {
 return {
 kind: 'client.capability.call',
Expand Down

10 changes: 10 additions & 0 deletions
packages/computer-use/src/__tests__/maka-cu-backend.test.ts

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Original file line numberDiff line numberDiff line change
Expand Up@@ -469,6 +469,16 @@ describe('maka-cu backend', () => {
 assert.deepEqual(received(records, 'permissions.check')[0], { prompt: false });
 });

 it('keeps routine preflight quiet and exposes an explicit Accessibility prompt request', async () => {
 const { backend, logPath } = makeBackend();

 await backend.preflight(signal());
 await backend.requestAccessibilityPermission(signal());

 const checks = received(await readRecords(logPath), 'permissions.check');
 assert.deepEqual(checks, [{ prompt: false }, { prompt: true }]);
 });

 it('fails loudly on a protocol version mismatch and does not retry', async () => {
 const { backend, logPath } = makeBackend({ protocol: 'maka.cu/99' });
 await assert.rejects(backend.preflight(signal()), /service_mismatch/);
Expand Down

9 changes: 8 additions & 1 deletion
packages/computer-use/src/maka-cu-backend.ts

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Original file line numberDiff line numberDiff line change
Expand Up@@ -454,8 +454,9 @@ export interface MakaCuLaunchedApp {
 */
export type MakaCuBackend = Omit<
 CuDispatchBackend,
 'runSemantic' | 'observeApp' | 'captureObservation'
 'runSemantic' | 'observeApp' | 'captureObservation' | 'requestAccessibilityPermission'
> & {
 requestAccessibilityPermission(signal: AbortSignal): Promise<void>;
 observeApp(
 input: {
 app?: string;
Expand DownExpand Up@@ -2251,6 +2252,12 @@ export function createMakaCuBackend(opts: MakaCuBackendOptions): MakaCuBackend {
 });
 },

 async requestAccessibilityPermission(signal) {
 await withOperationQueue(signal, async () => {
 await service.call('permissions.check', { prompt: true }, signal);
 });
 },

 async listApps(signal) {
 return withOperationQueue(signal, async (): Promise<CuAppSummary[]> => {
 try {
Expand Down

45 changes: 45 additions & 0 deletions
packages/runtime-host/src/__tests__/client-capability-protocol.test.ts

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Original file line numberDiff line numberDiff line change
Expand Up@@ -281,6 +281,51 @@ describe('Client Capability protocol', () => {
 ]),
 ),
 );
 assert.doesNotThrow(() =>
 decodeClientFrame(
 replaceFrame([
 {
 ...offer('tuple_schema', 'move'),
 tools: [
 {
 ...offer('tuple_schema', 'move').tools[0],
 inputSchema: {
 type: 'object',
 properties: {
 coordinate: {
 type: 'array',
 items: [{ type: 'integer' }, { type: 'integer' }],
 },
 },
 },
 },
 ],
 },
 ]),
 ),
 );
 for (const items of [[], [{ type: 'integer' }, 'not-a-schema']]) {
 assert.throws(
 () =>
 decodeClientFrame(
 replaceFrame([
 {
 ...offer('invalid_tuple_schema', 'move'),
 tools: [
 {
 ...offer('invalid_tuple_schema', 'move').tools[0],
 inputSchema: {
 type: 'object',
 properties: { coordinate: { type: 'array', items } },
 },
 },
 ],
 },
 ]),
 ),
 (error: unknown) => error instanceof RuntimeHostProtocolError,
 );
 }
 assert.throws(
 () =>
 decodeClientFrame({
Expand Down

18 changes: 16 additions & 2 deletions
packages/runtime-host/src/protocol/client-capability.ts

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Original file line numberDiff line numberDiff line change
Expand Up@@ -66,6 +66,7 @@ export const CLIENT_CAPABILITY_MAX_RESULT_CHUNKS = Math.ceil(
const CLIENT_CAPABILITY_INLINE_RESULT_MAX_BYTES = 40 * 1024;
const CLIENT_CAPABILITY_JSON_MAX_DEPTH = 32;
const CLIENT_CAPABILITY_JSON_MAX_NODES = 8_192;
const CLIENT_CAPABILITY_TOOL_DESCRIPTION_MAX_CHARS = 8_192;
const CLIENT_CAPABILITY_ERRORS = [
 'host_not_ready',
 'host_draining',
Expand DownExpand Up@@ -590,7 +591,11 @@ function decodeToolDescriptor(value: unknown): ClientCapabilityToolDescriptor {
 ...(record.description === undefined
 ? {}
 : {
 description: requireString(record.description, 'description', 4_096),
 description: requireString(
 record.description,
 'description',
 CLIENT_CAPABILITY_TOOL_DESCRIPTION_MAX_CHARS,
 ),
 }),
 inputSchema,
 ...(record.annotations === undefined
Expand DownExpand Up@@ -721,7 +726,16 @@ function validateToolInputSchema(root: Record<string, unknown>): void {
 ) {
 visit(schema.additionalProperties);
 }
 if (schema.items !== undefined) visit(schema.items);
 if (schema.items !== undefined) {
 if (Array.isArray(schema.items)) {
 if (schema.items.length === 0) {
 throw invalidProtocolFrame('Invalid Client Capability tool schema items');
 }
 for (const nested of schema.items) visit(nested);
 } else {
 visit(schema.items);
 }
 }
 for (const key of ['allOf', 'anyOf', 'oneOf'] as const) {
 if (schema[key] === undefined) continue;
 if (!Array.isArray(schema[key]) || schema[key].length === 0) {
Expand Down

22 changes: 22 additions & 0 deletions
packages/runtime/src/__tests__/computer-use-tools.test.ts

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Original file line numberDiff line numberDiff line change
Expand Up@@ -1791,6 +1791,28 @@ describe('buildComputerUseTools — the `maka_computer` MakaTool', () => {
 assert.match(r.text, /Accessibility/);
 });

 test('requests Accessibility once on first use while every action still preflights', async () => {
 let preflights = 0;
 let requests = 0;
 const backend = fakeBackend({ accessibility: false });
 backend.preflight = async () => {
 preflights += 1;
 return { accessibility: false, screenRecording: true };
 };
 backend.requestAccessibilityPermission = async () => {
 requests += 1;
 };
 const [tool] = buildComputerUseTools({ backend });

 const first = (await tool.impl({ action: 'wait' } as never, ctx())) as { text: string };
 const second = (await tool.impl({ action: 'wait' } as never, ctx())) as { text: string };

 assert.match(first.text, /permission_missing/);
 assert.match(second.text, /permission_missing/);
 assert.equal(preflights, 2);
 assert.equal(requests, 1);
 });

 test('S12: a capture action fails closed when Screen Recording is not granted', async () => {
 const backend = fakeBackend({ screenRecording: false });
 backend.observeApp = async () => observation();
Expand Down
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