M5: Docs + architecture updates for feature flags#10181
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noanflaherty merged 1 commit intoFeb 27, 2026
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Co-Authored-By: Claude <noreply@anthropic.com>
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* M1: Assistant config + skill feature flag enforcement (#10152) * feat: add skill feature flags config and enforcement Co-Authored-By: Claude <noreply@anthropic.com> * fix: enforce feature flags on included child skills and dynamic prompt section Add isSkillFeatureEnabled checks in skill_load for child skills in both the body-loading loop and the loaded_skill marker loop, so flag-OFF child skills are fully hidden. Also filter hardcoded browser/twitter references in buildDynamicSkillWorkflowSection through isSkillFeatureEnabled so the system prompt does not advertise disabled skills. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> --------- Co-authored-by: Claude <noreply@anthropic.com> * M2: Gateway feature-flags API + persistence (#10165) * feat: add gateway feature-flags REST API with config persistence Co-Authored-By: Claude <noreply@anthropic.com> * fix: handle malformed URI encoding and config parse errors in feature-flags - Wrap decodeURIComponent in try/catch in gateway/src/index.ts to return 400 Bad Request on malformed percent-encoding instead of crashing to the global error handler with a misleading 500. - Refactor readConfigFile to use a discriminated union result type that distinguishes "file doesn't exist" (returns empty config) from "file exists but can't be parsed" (returns error). The PATCH handler now returns 500 with a descriptive message when the config file is malformed, preventing silent data loss. The GET handler gracefully degrades to empty flags on parse errors (no data loss risk). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * fix: validate parsed config is a plain object in readConfigFile --------- Co-authored-by: Claude <noreply@anthropic.com> * M3: Client-only PATCH auth split for feature flags (#10171) * feat: add client-only PATCH auth split for feature-flags Co-Authored-By: Claude <noreply@anthropic.com> * fix: remove rate-limit on 403 and handle identical token edge case - Remove authRateLimiter.recordFailure() from 403 path to avoid penalizing legitimately authenticated clients who used the wrong token type (Issue 1) - Only record failures on 401 (truly invalid authentication) - Skip runtime-token rejection when FEATURE_FLAG_TOKEN is identical to runtimeBearerToken to support single-token deployments (Issue 2) Addresses review feedback on PR #10171 --------- Co-authored-by: Claude <noreply@anthropic.com> * M4: Client token plumbing (macOS/iOS) (#10175) * feat: add feature-flag client token plumbing for macOS/iOS Co-Authored-By: Claude <noreply@anthropic.com> * fix: throw on unavailable transport, always use gateway on macOS, clear stale token Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> --------- Co-authored-by: Claude <noreply@anthropic.com> * docs: add feature-flags architecture documentation (#10181) Co-authored-by: Claude <noreply@anthropic.com> * fix: use active transport for macOS remote mode, preserve token on re-pair Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * fix: address review feedback on final PR #10183 1. [P1] Fix gateway type-check: remove dead `not_found` variant from ConfigReadResult union (fixes narrowing bug on `result.detail`), make `featureFlagToken` optional in GatewayConfig type. 2. [P1] Add featureFlagToken to pairing responses: runtime now reads ~/.vellum/feature-flag-token and includes it in approval responses so iOS receives the token during QR pairing. 3. [P1] Fix PATCH auth bypass when tokens equal: loadConfig() now detects token collision and regenerates the feature-flag token to ensure the auth split is always enforceable. 4. [P2] Gate guardian-verification section on feature flags: system prompt skips buildGuardianVerificationRoutingSection() when guardian-verify-setup skill flag is OFF. 5. [P2] Fix failing integration test: removed incorrect assertion that <available_skills> disappears when only browser/twitter flags are OFF (bundled skills remain visible). 6. [P2] Fix macOS local HTTP transport: setFeatureFlag now checks if httpTransport.baseURL is localhost before delegating — local HTTP mode (localHttpEnabled) falls through to the direct gateway call. 7. [P2] Accept dotted skill IDs in feature-flag keys: updated regex from [a-z0-9_-]+ to [a-z0-9][a-z0-9._-]* to match managed skill ID validation. * Migrate hatch visibility to skill flag and remove deprecated client flags --------- Co-authored-by: Claude <noreply@anthropic.com>
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Update ARCHITECTURE.md, assistant/ARCHITECTURE.md, and gateway/ARCHITECTURE.md to document the feature-flags system: gateway API surface, workspace config persistence, enforcement points, and client-only PATCH auth boundary. Part of #10145.