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fix(agent): follow the served surface for tool schema rules and replay - #4618

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fix/runtime-protocol-by-surface-1922
Sep 27, 2026
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kojiwakayama merged 2 commits into
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fix/runtime-protocol-by-surface-1922

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@kojiwakayama kojiwakayama commented Sep 27, 2026 •

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Refs veryfront/veryfront-issue-inbox#1922. Follow-up of #4610.

What changes

The served catalog can list a Veryfront Cloud provider that this package does not name, served on the Google or Anthropic surface. Request building already follows the served surface (#4610). Two runtime decisions still went by the provider name:

  • Tool schema rules (getProviderToolProfile). A veryfront-cloud/ model of an unlisted provider now takes the profile of its served surface: google, with schema sanitisation, or anthropic. Schema limits belong to the wire protocol. Providers already named keep their profiles. Direct (non-Cloud) ids and providers on the OpenAI surface stay unknown, as before.
  • Provider replay (resolveActiveProviderReplayProvider). A model settled on the Anthropic surface replays thinking and tool blocks like anthropic/*. The mapping and resolveRuntimeGenAiProviderName move out of src/agent/runtime/index.ts into provider-replay-protocol.ts, so they can be tested directly. Behaviour for named providers is unchanged.

Unchanged on purpose: provider-hosted tools (web_search, web_fetch) still follow the vendor, since a third-party model served over the Anthropic protocol cannot run the vendor's hosted tools.

New helper: resolveVeryfrontCloudModelSurface(modelId). isVeryfrontCloudAnthropicSurfaceModel now uses it.

Tests

  • provider-tool-compat.test.ts: an unlisted provider on the Google or Anthropic surface gets that profile. OpenAI-surface and direct ids stay unknown. The test fails on main.
  • provider-replay-protocol.test.ts:
    • named providers replay as before;
    • a provider on the Anthropic surface replays as anthropic;
    • other surfaces, or no served facts, give unsupported;
    • GenAI provider names.
  • Gates: fmt:check, typecheck and lint:ci pass. test:file on src/agent/runtime, src/provider, src/agent/hosted and tests/integration/agent: 1411 passed, 0 failed.

Summary by CodeRabbit

  • Improvements
    • Improved compatibility for Veryfront Cloud models across replay and tool handling, based on each model’s provider surface.
    • Expanded provider recognition for replay and model identification, including additional provider formats.
  • Documentation
    • Clarified that provider lookup can return a provider named by a model ID even if it is not listed in the package, or no result if the ID names no provider.

A Veryfront Cloud provider that only the served catalog lists takes the tool
schema rules of the surface it is served on (Google or Anthropic), and a
provider served on the Anthropic surface replays thinking and tool blocks like
anthropic/*. Provider-hosted tools (web search, web fetch) still follow the
vendor, since a third-party model cannot run them. The replay provider mapping
moves to provider-replay-protocol.ts so it can be tested directly.
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📦 Client bundle boundary

Entrypoint Modules Source size Server leaks
src/index.client.ts 289 2323 KiB ✅ 0

A server module in a client graph aborts hydration in the browser. New leaks fail CI; known leaks are tracked in scripts/lint/client-bundle-baseline.json to burn down.

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📒 Files selected for processing (2)
  • src/agent/runtime/provider-tool-compat.test.ts
  • src/agent/runtime/provider-tool-compat.ts
📝 Walkthrough

Walkthrough

The changes add Veryfront Cloud model-surface resolution, use that surface to classify tool profiles, and centralize provider replay and GenAI provider-name resolution for runtime models.

Changes

Provider Resolution

Layer / File(s) Summary
Resolve surfaces and classify tool profiles
src/provider/veryfront-cloud/model-catalog.ts, src/agent/runtime/provider-tool-compat.ts, src/agent/runtime/provider-tool-compat.test.ts, docs/api-reference/veryfront/provider.md
The model catalog exposes a resolver for a model ID’s wire surface. Tool-profile classification uses Google and Anthropic surfaces for otherwise-unrecognized Veryfront Cloud models. Tests cover these profiles and unknown cases. The API reference describes provider lookup results.
Resolve replay protocols in runtime loops
src/agent/runtime/provider-replay-protocol.ts, src/agent/runtime/index.ts, src/agent/runtime/provider-replay-protocol.test.ts
Replay-provider and GenAI provider-name resolution move into provider-replay-protocol.ts. The generate and streaming loops use the replay resolver. Tests cover recognized providers, served surfaces, and unrecognized IDs.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

🚥 Pre-merge checks | ✅ 5
✅ Passed checks (5 passed)
Check name Status Explanation
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check ✅ Passed The title clearly summarizes the main change: agent behavior now follows the served surface for tool schema rules and replay.
Docstring Coverage ✅ Passed Docstring coverage is 87.50% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 8 functions across 6 files. (1 skipped: 1 u…
Linked Issues check ✅ Passed Check skipped because no linked issues were found for this pull request.
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Review score: 89/100 — good, minor suggestions

Traced the new surface-resolution logic (resolveVeryfrontCloudModelSurface, resolveActiveProviderReplayProvider, getProviderToolProfile's Cloud fallback) against the existing routing/catalog helpers and the added tests. The change is coherent and correctly scoped.

Strengths

  • Both code paths (tool schema profile and replay provider) now derive from the served surface via resolveVeryfrontCloudSurface/readVeryfrontCloudModelFacts rather than hardcoding vendor names, matching the stated goal ("schema limits and replay format belong to the wire protocol, not the vendor"). Verified this doesn't regress named providers: anthropic/openai/moonshot(ai) checks still short-circuit before the new Cloud fallback in both getProviderToolProfile and resolveActiveProviderReplayProvider.
  • Provider-hosted tools (web_search/web_fetch) are deliberately left vendor-scoped, which is the right call and is called out explicitly rather than silently left inconsistent.
  • Good test coverage for the actual behavior change: provider-tool-compat.test.ts exercises Google/Anthropic-surface Cloud providers get sanitized schemas, while OpenAI-surface and direct (non-Cloud) ids stay unknown. provider-replay-protocol.test.ts covers named providers, Anthropic-surface passthrough, and the "no facts / other surface" negative case.
  • Small, welcome side-fix: the orphaned JSDoc comment that was misattached to isVeryfrontCloudAnthropicSurfaceModel (leaving tryGetVeryfrontCloudProviderFromModelId's generated docs table row blank) is now correctly placed, and the docs diff reflects it.
  • Pure extraction of resolveActiveProviderReplayProvider/resolveRuntimeGenAiProviderName out of src/agent/runtime/index.ts into a dedicated, directly-testable module — no behavior change there, confirmed the one remaining caller of resolveRuntimeGenAiProviderName in index.ts (line ~3632) still resolves correctly and no dangling ProviderReplayProvider import was left behind.

Minor concerns (non-blocking)

  • resolveActiveProviderReplayProvider's surface fallback (readVeryfrontCloudModelFacts(...)?.surface === "anthropic") runs unconditionally, even when provider resolved to some other named value (e.g. "google") rather than only for the "no known name" case. Currently harmless since only "anthropic"/"openai" short-circuit early, but if a named-but-not-anthropic/openai provider ever gets Cloud facts with surface === "anthropic" attached, it would take Anthropic replay despite having an explicit non-Anthropic name. Worth a comment or an explicit guard if that's not intended to be reachable.
  • PR is a stacked follow-up (refs feat(provider): read model facts from the served catalog instead of the shipped table #4610); mergeable state shows blocked (open review threads / awaiting review per GitHub), so this isn't a merge-readiness signal, just noting it's not yet approved.
  • Couldn't execute deno task test:file in this review environment (no deno on PATH here), so I relied on static tracing plus the PR's own reported gate results (fmt/typecheck/lint + 1411 passed) rather than independently re-running them.

Solid, well-tested, narrowly-scoped fix. Nothing here should block merge once review threads are resolved.


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Codex Review: Didn't find any major issues. Another round soon, please!

Reviewed commit: f98ab855fc

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Actionable comments posted: 1


  • 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In @src/agent/runtime/provider-tool-compat.ts:
- Around line 108-109: Update the Veryfront Cloud classification branch to
resolve the served surface for unlisted providers before applying the kimi-
model-name heuristic. Preserve the existing Moonshot path for the named moonshot
and moonshotai providers, return the Google or Anthropic profile when
resolveVeryfrontCloudModelSurface identifies those surfaces, and return the
unknown profile for other surfaces.

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📒 Files selected for processing (7)
  • docs/api-reference/veryfront/provider.md
  • src/agent/runtime/index.ts
  • src/agent/runtime/provider-replay-protocol.test.ts
  • src/agent/runtime/provider-replay-protocol.ts
  • src/agent/runtime/provider-tool-compat.test.ts
  • src/agent/runtime/provider-tool-compat.ts
  • src/provider/veryfront-cloud/model-catalog.ts

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Comment thread src/agent/runtime/provider-tool-compat.ts
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Codex Review: Didn't find any major issues. You're on a roll.

Reviewed commit: 5d98503a85

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Codecov Report

❌ Patch coverage is 96.66667% with 2 lines in your changes missing coverage. Please review.

Files with missing lines Patch % Lines
src/agent/runtime/provider-replay-protocol.ts 94.73% 1 Missing and 1 partial ⚠️

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@kojiwakayama
kojiwakayama added this pull request to the merge queue Sep 27, 2026
Merged via the queue into main with commit 00ca749 Sep 27, 2026
62 checks passed
@kojiwakayama
kojiwakayama deleted the fix/runtime-protocol-by-surface-1922 branch September 27, 2026 15:24
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