feat(server): stamp maxTokens into OpenCode's token-usage snapshot - #47
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The context-window meter renders an empty ring for OpenCode threads because openCodeTokenUsageSnapshot never set maxTokens, unlike the Claude adapter's equivalent. The cap is already available in provider.list responses. Loads the OpenCode model inventory once per session (fire-and-forget, forked into the session scope, so a slow/failing provider.list can't delay or fail session startup), builds a providerID/modelID to context-cap map, and stamps it into each message.updated snapshot. Dropped the plan's lastObservedModelKey field: it was reserved for a future model-swap detector this change doesn't implement, so keeping it would be adding unused state ahead of need.
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Included review availability: Your plan provides up to 8 included reviews per hour; 6 remain after this review. 📝 WalkthroughWalkthroughOpenCode sessions now load provider/model context limits in the background. Assistant token-usage snapshots include matching positive, rounded ChangesOpenCode context-limit reporting
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk:⚪ Minimal · up to This localized change adds OpenCode context-cap data to token-usage snapshots without changing existing consumers; no actionable merge-blocking risk remains beyond normal checks and review. Sequence Diagram(s)sequenceDiagram
participant OpenCodeSession
participant ProviderInventory
participant AssistantMessage
participant TokenUsageSnapshot
OpenCodeSession->>ProviderInventory: Load provider/model context limits
ProviderInventory-->>OpenCodeSession: Return limits or failure
AssistantMessage->>TokenUsageSnapshot: Build snapshot with session limits
TokenUsageSnapshot-->>AssistantMessage: Include positive rounded maxTokens
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Inline comments:
In `@apps/server/src/provider/Layers/OpenCodeAdapter.ts`:
- Line 599: The maxTokens construction in OpenCodeAdapter must omit the field
when rounding a positive fractional input produces zero. Validate the rounded
value is positive before emitting maxTokens, and add a regression test covering
maxTokens 0.4 while preserving normal positive integer behavior.
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apps/server/src/provider/Layers/OpenCodeAdapter.test.tsapps/server/src/provider/Layers/OpenCodeAdapter.ts
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A cap below 1 (e.g. 0.4) passed the pre-rounding positivity check, then Math.round produced 0, which violates the PositiveInt schema field. Now re-checks positivity after rounding.
The context-window meter (
ContextWindowMeter.tsx) renders an empty ring and shows a bare token count whenusage.maxTokensisnull. OpenCode always emits this state becauseopenCodeTokenUsageSnapshotnever setmaxTokens, unlike the Claude adapter's equivalent (ClaudeAdapter.ts), which does.The cap is already available: every
provider.listresponse carriesmodels[*].limit.context, and everyAssistantMessagecarriesproviderID/modelID. The adapter just never read either.Changes
OpenCodeAdapter.ts— loads the OpenCode model inventory once per session viaprovider.list(fire-and-forget, forked into the session scope, so a slow/failing load can't delay or fail session startup), builds aproviderID/modelID → context capmap onOpenCodeSessionContext, and stamps it intoopenCodeTokenUsageSnapshoton eachmessage.updated.OpenCodeAdapter.test.ts— extends the existing token-usage-snapshot test with matching-key, unknown-key, and zero/negative-entry cases.ThreadTokenUsageSnapshot.maxTokensis alreadySchema.optional(PositiveInt), so this is purely additive — consumers that ignore the field are unaffected.Deliberately skipped
lastObservedModelKeyfield. It was reserved for a future model-swap detector this change doesn't implement — added it, it'd just be unused state ahead of need.openCodeTokenUsageSnapshotalready cover the actual stamping logic deterministically.Out of scope (noted for follow-up)
Validation
apps/servertypecheck: clean (only the pre-existing, unrelated suggestion atOpenAICompatibleWorkspaceAdapter.ts:1179, present onmaintoo)npx vitest run apps/server/src/provider/Layers/OpenCodeAdapter.test.ts— 31/31 passnpx vitest run apps/web/src/lib/contextWindow.test.ts— 5/5 pass (unaffected, sanity check)Summary by CodeRabbit