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mcp: support per-resource cache policy for resources/read #1185

Open
#1202
Open
mcp: support per-resource cache policy for resources/read#1185
#1202
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P2Moderate issues, valuable feature requests

Description

@makeavish
makeavish
opened on Aug 19, 2026

Is your feature request related to a problem? Please describe.

A server may expose both public static resources and tenant-specific resource templates. Today, assigning the correct ttlMs and cacheScope to each resources/read result requires receiving middleware—or the proposed DefaultCacheable callback in #1128—to inspect the request URI. That duplicates policy already known where the resource is registered.

Describe the solution you'd like

Allow direct resources and resource templates to declare a cache hint at registration. The matched resource's hint should apply only to its resources/read result, take precedence over the server default, and not appear in resources/list or resources/templates/list.

For example, a server could register static documentation as public and a tenant-backed template as private without central URI matching.

The TypeScript SDK already supports this through cacheHint on registerResource.

Describe alternatives you've considered

  • Receiving middleware works, but moves resource-specific policy away from registration.
  • mcp: add ServerOptions.DefaultCacheable #1128's server-level callback is useful for broad or request-dependent defaults, but registration-level policy would complement it for stable per-resource semantics.

Additional context

Related: #1094 and #1128.

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      , 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
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(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';
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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!';
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codeBlock.parentElement.style.position = 'relative';
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observer.observe(document.body, { childList: true, subtree: true });
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} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
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try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
mcp: support per-resource cache policy for resources/read · Issue #1185 · modelcontextprotocol/go-sdk · GitHub
      Skip to content
      mcp: support per-resource cache policy for resources/read #1185
      Open
      #1202
      Open
      mcp: support per-resource cache policy for resources/read#1185
      #1202
      Labels
      P2Moderate issues, valuable feature requests
      Description
      @makeavish
      makeavish
      opened on Aug 19, 2026
      Is your feature request related to a problem? Please describe.
      A server may expose both public static resources and tenant-specific resource templates. Today, assigning the correct ttlMs and cacheScope to each resources/read result requires receiving middleware—or the proposed DefaultCacheable callback in #1128—to inspect the request URI. That duplicates policy already known where the resource is registered.
      Describe the solution you'd like
      Allow direct resources and resource templates to declare a cache hint at registration. The matched resource's hint should apply only to its resources/read result, take precedence over the server default, and not appear in resources/list or resources/templates/list.
      For example, a server could register static documentation as public and a tenant-backed template as private without central URI matching.
      The TypeScript SDK already supports this through cacheHint on registerResource.
      Describe alternatives you've considered
      • Receiving middleware works, but moves resource-specific policy away from registration.
      • mcp: add ServerOptions.DefaultCacheable #1128's server-level callback is useful for broad or request-dependent defaults, but registration-level policy would complement it for stable per-resource semantics.
      Additional context
      Related: #1094 and #1128.
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
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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);
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}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
mcp: support per-resource cache policy for resources/read · Issue #1185 · modelcontextprotocol/go-sdk · GitHub
          Skip to content
          mcp: support per-resource cache policy for resources/read #1185
          Open
          #1202
          Open
          mcp: support per-resource cache policy for resources/read#1185
          #1202
          Labels
          P2Moderate issues, valuable feature requests
          Description
          @makeavish
          makeavish
          opened on Aug 19, 2026
          Is your feature request related to a problem? Please describe.
          A server may expose both public static resources and tenant-specific resource templates. Today, assigning the correct ttlMs and cacheScope to each resources/read result requires receiving middleware—or the proposed DefaultCacheable callback in #1128—to inspect the request URI. That duplicates policy already known where the resource is registered.
          Describe the solution you'd like
          Allow direct resources and resource templates to declare a cache hint at registration. The matched resource's hint should apply only to its resources/read result, take precedence over the server default, and not appear in resources/list or resources/templates/list.
          For example, a server could register static documentation as public and a tenant-backed template as private without central URI matching.
          The TypeScript SDK already supports this through cacheHint on registerResource.
          Describe alternatives you've considered
          • Receiving middleware works, but moves resource-specific policy away from registration.
          • mcp: add ServerOptions.DefaultCacheable #1128's server-level callback is useful for broad or request-dependent defaults, but registration-level policy would complement it for stable per-resource semantics.
          Additional context
          Related: #1094 and #1128.
          Metadata
          Metadata
          Assignees
          No one assigned
            Labels
            P2Moderate issues, valuable feature requests
            Type
            No type
            Projects
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              Milestone
              No milestone
              Relationships
              None yet
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              No branches or pull requests
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
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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; });
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}
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');
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found = true;
var frag = document.createDocumentFragment();
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parts.forEach(function(part, i) {
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var span = document.createElement('span');
span.className = 'userscript-highlight';
span.textContent = part;
frag.appendChild(span);
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});
node.parentNode.replaceChild(frag, node);
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var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];
if (!skipTags.includes(node.tagName)) {
Array.from(node.childNodes).forEach(highlight);
}
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highlight(document.body);
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var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1 || node.nodeType === 3) highlight(node);
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});
});
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('^' + ".*" + '
mcp: support per-resource cache policy for resources/read · Issue #1185 · modelcontextprotocol/go-sdk · GitHub
              Skip to content
              mcp: support per-resource cache policy for resources/read #1185
              Open
              #1202
              Open
              mcp: support per-resource cache policy for resources/read#1185
              #1202
              Labels
              P2Moderate issues, valuable feature requests
              Description
              @makeavish
              makeavish
              opened on Aug 19, 2026
              Is your feature request related to a problem? Please describe.
              A server may expose both public static resources and tenant-specific resource templates. Today, assigning the correct ttlMs and cacheScope to each resources/read result requires receiving middleware—or the proposed DefaultCacheable callback in #1128—to inspect the request URI. That duplicates policy already known where the resource is registered.
              Describe the solution you'd like
              Allow direct resources and resource templates to declare a cache hint at registration. The matched resource's hint should apply only to its resources/read result, take precedence over the server default, and not appear in resources/list or resources/templates/list.
              For example, a server could register static documentation as public and a tenant-backed template as private without central URI matching.
              The TypeScript SDK already supports this through cacheHint on registerResource.
              Describe alternatives you've considered
              • Receiving middleware works, but moves resource-specific policy away from registration.
              • mcp: add ServerOptions.DefaultCacheable #1128's server-level callback is useful for broad or request-dependent defaults, but registration-level policy would complement it for stable per-resource semantics.
              Additional context
              Related: #1094 and #1128.
              Metadata
              Metadata
              Assignees
              No one assigned
                Labels
                P2Moderate issues, valuable feature requests
                Type
                No type
                Projects
                No projects
                  Milestone
                  No milestone
                  Relationships
                  None yet
                  Development
                  No branches or pull requests
                  Issue actions
                  
, '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) {
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if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
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} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
mcp: support per-resource cache policy for resources/read · Issue #1185 · modelcontextprotocol/go-sdk · GitHub
                  Skip to content
                  mcp: support per-resource cache policy for resources/read #1185
                  Open
                  #1202
                  Open
                  mcp: support per-resource cache policy for resources/read#1185
                  #1202
                  Labels
                  P2Moderate issues, valuable feature requests
                  Description
                  @makeavish
                  makeavish
                  opened on Aug 19, 2026
                  Is your feature request related to a problem? Please describe.
                  A server may expose both public static resources and tenant-specific resource templates. Today, assigning the correct ttlMs and cacheScope to each resources/read result requires receiving middleware—or the proposed DefaultCacheable callback in #1128—to inspect the request URI. That duplicates policy already known where the resource is registered.
                  Describe the solution you'd like
                  Allow direct resources and resource templates to declare a cache hint at registration. The matched resource's hint should apply only to its resources/read result, take precedence over the server default, and not appear in resources/list or resources/templates/list.
                  For example, a server could register static documentation as public and a tenant-backed template as private without central URI matching.
                  The TypeScript SDK already supports this through cacheHint on registerResource.
                  Describe alternatives you've considered
                  • Receiving middleware works, but moves resource-specific policy away from registration.
                  • mcp: add ServerOptions.DefaultCacheable #1128's server-level callback is useful for broad or request-dependent defaults, but registration-level policy would complement it for stable per-resource semantics.
                  Additional context
                  Related: #1094 and #1128.
                  Metadata
                  Metadata
                  Assignees
                  No one assigned
                    Labels
                    P2Moderate issues, valuable feature requests
                    Type
                    No type
                    Projects
                    No projects
                      Milestone
                      No milestone
                      Relationships
                      None yet
                      Development
                      No branches or pull requests
                      Issue actions
                      
, '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('^' + ".*" + '
mcp: support per-resource cache policy for resources/read · Issue #1185 · modelcontextprotocol/go-sdk · GitHub
                      Skip to content
                      mcp: support per-resource cache policy for resources/read #1185
                      Open
                      #1202
                      Open
                      mcp: support per-resource cache policy for resources/read#1185
                      #1202
                      Labels
                      P2Moderate issues, valuable feature requests
                      Description
                      @makeavish
                      makeavish
                      opened on Aug 19, 2026
                      Is your feature request related to a problem? Please describe.
                      A server may expose both public static resources and tenant-specific resource templates. Today, assigning the correct ttlMs and cacheScope to each resources/read result requires receiving middleware—or the proposed DefaultCacheable callback in #1128—to inspect the request URI. That duplicates policy already known where the resource is registered.
                      Describe the solution you'd like
                      Allow direct resources and resource templates to declare a cache hint at registration. The matched resource's hint should apply only to its resources/read result, take precedence over the server default, and not appear in resources/list or resources/templates/list.
                      For example, a server could register static documentation as public and a tenant-backed template as private without central URI matching.
                      The TypeScript SDK already supports this through cacheHint on registerResource.
                      Describe alternatives you've considered
                      • Receiving middleware works, but moves resource-specific policy away from registration.
                      • mcp: add ServerOptions.DefaultCacheable #1128's server-level callback is useful for broad or request-dependent defaults, but registration-level policy would complement it for stable per-resource semantics.
                      Additional context
                      Related: #1094 and #1128.
                      Metadata
                      Metadata
                      Assignees
                      No one assigned
                        Labels
                        P2Moderate issues, valuable feature requests
                        Type
                        No type
                        Projects
                        No projects
                          Milestone
                          No milestone
                          Relationships
                          None yet
                          Development
                          No branches or pull requests
                          Issue actions
                          
, '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';
}
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}
unstick();
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observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
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} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
mcp: support per-resource cache policy for resources/read · Issue #1185 · modelcontextprotocol/go-sdk · GitHub
                          Skip to content
                          mcp: support per-resource cache policy for resources/read #1185
                          Open
                          #1202
                          Open
                          mcp: support per-resource cache policy for resources/read#1185
                          #1202
                          Labels
                          P2Moderate issues, valuable feature requests
                          Description
                          @makeavish
                          makeavish
                          opened on Aug 19, 2026
                          Is your feature request related to a problem? Please describe.
                          A server may expose both public static resources and tenant-specific resource templates. Today, assigning the correct ttlMs and cacheScope to each resources/read result requires receiving middleware—or the proposed DefaultCacheable callback in #1128—to inspect the request URI. That duplicates policy already known where the resource is registered.
                          Describe the solution you'd like
                          Allow direct resources and resource templates to declare a cache hint at registration. The matched resource's hint should apply only to its resources/read result, take precedence over the server default, and not appear in resources/list or resources/templates/list.
                          For example, a server could register static documentation as public and a tenant-backed template as private without central URI matching.
                          The TypeScript SDK already supports this through cacheHint on registerResource.
                          Describe alternatives you've considered
                          • Receiving middleware works, but moves resource-specific policy away from registration.
                          • mcp: add ServerOptions.DefaultCacheable #1128's server-level callback is useful for broad or request-dependent defaults, but registration-level policy would complement it for stable per-resource semantics.
                          Additional context
                          Related: #1094 and #1128.
                          Metadata
                          Metadata
                          Assignees
                          No one assigned
                            Labels
                            P2Moderate issues, valuable feature requests
                            Type
                            No type
                            Projects
                            No projects
                              Milestone
                              No milestone
                              Relationships
                              None yet
                              Development
                              No branches or pull requests
                              Issue actions
                              
, '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); }
})();
})();
mcp: support per-resource cache policy for resources/read · Issue #1185 · modelcontextprotocol/go-sdk · GitHub
                              Skip to content
                              mcp: support per-resource cache policy for resources/read #1185
                              Open
                              #1202
                              Open
                              mcp: support per-resource cache policy for resources/read#1185
                              #1202
                              Labels
                              P2Moderate issues, valuable feature requests
                              Description
                              @makeavish
                              makeavish
                              opened on Aug 19, 2026
                              Is your feature request related to a problem? Please describe.
                              A server may expose both public static resources and tenant-specific resource templates. Today, assigning the correct ttlMs and cacheScope to each resources/read result requires receiving middleware—or the proposed DefaultCacheable callback in #1128—to inspect the request URI. That duplicates policy already known where the resource is registered.
                              Describe the solution you'd like
                              Allow direct resources and resource templates to declare a cache hint at registration. The matched resource's hint should apply only to its resources/read result, take precedence over the server default, and not appear in resources/list or resources/templates/list.
                              For example, a server could register static documentation as public and a tenant-backed template as private without central URI matching.
                              The TypeScript SDK already supports this through cacheHint on registerResource.
                              Describe alternatives you've considered
                              • Receiving middleware works, but moves resource-specific policy away from registration.
                              • mcp: add ServerOptions.DefaultCacheable #1128's server-level callback is useful for broad or request-dependent defaults, but registration-level policy would complement it for stable per-resource semantics.
                              Additional context
                              Related: #1094 and #1128.
                              Metadata
                              Metadata
                              Assignees
                              No one assigned
                                Labels
                                P2Moderate issues, valuable feature requests
                                Type
                                No type
                                Projects
                                No projects
                                  Milestone
                                  No milestone
                                  Relationships
                                  None yet
                                  Development
                                  No branches or pull requests
                                  Issue actions