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feat(mcp): expose cached provider usage limits - #17219
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configuration
📒 Files selected for processing (7)
🚧 Files skipped from review as they are similar to previous changes (1)
Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 8 remain after this review. 📝 WalkthroughWalkthroughThe change adds ChangesProvider usage limits
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant MCP client
participant Environment toolkit
participant ProviderUsageLimitsMcpService
participant UsageLimitsService
participant Provider registry
participant UsageLimitSources
MCP client->>Environment toolkit: Call t3_provider_usage_limits
Environment toolkit->>ProviderUsageLimitsMcpService: Read quota report
ProviderUsageLimitsMcpService->>ProviderUsageLimitsMcpService: Check caller and server environment IDs
ProviderUsageLimitsMcpService->>UsageLimitsService: Read when environment IDs match
UsageLimitsService->>Provider registry: Read cached provider snapshots
UsageLimitsService->>UsageLimitSources: Read cached source snapshots
UsageLimitsService-->>ProviderUsageLimitsMcpService: Return sanitized quota report
ProviderUsageLimitsMcpService-->>Environment toolkit: Return report or capability_denied
Environment toolkit-->>MCP client: Return result
Suggested reviewers: Merge Risk: ⚪ Minimal · up to The cached quota tool is ready to merge after normal checks; no actionable behavior issue remains identified. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The new read-only interface exposes cached quota information within the caller’s environment. Access checks and explicit field selection limit exposure. Deployment isolation and the contents of externally supplied account identifiers remain only partially established. Retained concerns Security review detailsSecurity Blast Radius
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🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Actionable comments posted: 2
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @apps/server/src/mcp/toolkits/environment/handlers.ts:
- Around line 48-56: Move the environment scope validation and quota read from
this handler into one reusable method on UsageLimitsService, reusing the scope
check in access where appropriate. Update the handler to call only that service
method and preserve the capability_denied result for mismatched environments.
Review comments at @docs/user/usage.md:
- Around line 122-123: Update the usage documentation for
UsageLimitsService.read to distinguish the timestamps: describe checkedAt as
when quota data was observed, ageSeconds as the data’s age, and readAt as when
the call read it. Make clear that reading cached data does not refresh or
re-observe the quota.
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📒 Files selected for processing (10)
apps/server/src/mcp/McpHttpServer.tsapps/server/src/mcp/toolkits/environment/handlers.test.tsapps/server/src/mcp/toolkits/environment/handlers.tsapps/server/src/mcp/toolkits/environment/tools.tsapps/server/src/mcp/toolkits/worktree/registration.test.tsapps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.tsapps/server/src/usage/UsageLimitsService.test.tsapps/server/src/usage/UsageLimitsService.tsdocs/user/usage.mdpackages/contracts/src/providerUsageLimits.ts
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Problem
MCP clients can discover configured providers but cannot read their current subscription quota. Discussion #15137 asks for remaining quota per provider/account, including session and weekly windows.
Change
Add the read-only, no-argument
t3_provider_usage_limitstool using the existing cachedProviderRegistryandUsageLimitSourcesdata. It returns provider instances and hub accounts separately, with usage windows, remaining percentages, reported reset timestamps, observation timestamps and age, and explicit available/unavailable/error/not-reported states.An MCP service validates caller capability and environment scope before reading the domain service. The shared contract defines the sanitized result; MCP registration, required tool catalog metadata, and Claude's read-only allowlist integrate it with existing provider paths. Credentials, fingerprints, auth metadata, runtime paths, reset-credit identifiers, URLs, and raw diagnostics are omitted. The user guide explains cached freshness and missing-data semantics.
Scope and approval
Only current quota visibility through MCP is included. No refreshing/probing, automatic account selection or switching, scheduling, orchestration policies, or UI changes.
Maintainer approval is pending. Discussion #15137 has no explicit maintainer approval comment. This is a feature, not an obvious-bug fix or configuration option, and no approval exemption is claimed. The implementation was requested by the contributor; that does not satisfy upstream maintainer approval. The repository's prior-approval requirement remains unmet until a maintainer approves the direction and scope.
Overlap inspected before implementation: open #15465 includes quota windows in a broader, full-access provider-status tool. This standalone PR offers sanitized read-only access and includes hub accounts. Closed #8730 addresses historical token/cost usage rather than subscription quota.
Verification
On macOS in an isolated worktree:
vp test run apps/server/src/usage/UsageLimitsService.test.ts apps/server/src/mcp/toolkits/environment/handlers.test.ts apps/server/src/mcp/toolkits/worktree/registration.test.ts apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.test.ts: 164 tests passed. Service tests verify separate account identities, 0–100% remaining quota, reset preservation, observation age, unavailable/error/missing data, secret redaction, empty collections, and no refresh calls. Handler tests allow read-only clients and deny missing capabilities or mismatched environments before reading quota. The production HTTP test discovers the tool with read-only hints and a root object input schema; the adapter test checks the Claude allowlist against tool annotations.vp test run apps/server/src/mcp/toolkits/core.test.ts apps/server/src/mcp/toolkits/environment/handlers.test.ts packages/shared/src/t3McpToolPresentation.test.ts: all 28 tests passed, including the previously failing catalog test.vp run -F t3 typecheckandvp run -F @t3tools/contracts typecheckpassed; server and shared-package typechecks also passed after the review fixes. Targeted lint and formatting passed; the unchanged Claude adapter has an existing unused-variable lint warning.vp exec knip --workspace apps/server --include exports --preprocessor ./scripts/knip-schemas.ts --no-config-hintsandgit diff --checkpassed.The HTTP test needed permission to bind its temporary port. Live provider probes, browsers, devices, and live userdata were not used. Cached successful readings may survive a failed probe, and elapsed reset timestamps do not prove replenishment; the tool exposes the observation time rather than claiming live quota.
Implemented by GPT-6.1-Sol via the Codex harness in T3 Code.