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fix(cloud): release EU model support and hosted defaults in 0.1.1263 - #4560

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fix/phase1-hosted-default
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fix/phase1-hosted-default

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@kwakayama kwakayama commented Sep 22, 2026 •

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Description

Agents that omit model currently keep selecting GPT-5.4 Nano, which the hosted EU inference policy refuses. Use Mistral Small 3.1 as the hosted default and preserve the original omission through agent construction so request-scoped Cloud context can select it at execution time. The Cloud catalog default changes with it. Explicit model selections and the self-hosted OpenAI default remain intact, including direct-provider auto precedence.

The release also recognizes the newly served openai/gpt-5-nano and deepseek/deepseek-v4-flash identities. GPT-5 Nano remains distinct from GPT-5.4 Nano; DeepSeek uses its own gateway provider with Chat Completions only. The generator renderer preserves existing catalog transport facts because the public staging payload currently omits surface fields. Hosted Mistral remains the default.

Refs veryfront/veryfront-issue-inbox#1661 and veryfront/veryfront-issue-inbox#1682. Builds on merged #4559. Bumps the package and runtime version to 0.1.1263 and regenerates hydration output so merge requests publication and the downstream runtime-image rollout. Saved model selections and the API catalog default are tracked separately under #1661.

Validation

  • Regression tests fail before the fix for omitted hosted models and Cloud context attached after agent construction.
  • deno task test:file src/agent/runtime: 598 tests / 1053 steps (including factory and omission tracking) pass.
  • deno task test:file src/agent/factory.test.ts: 33 steps pass.
  • deno task test:file src/provider/veryfront-cloud: 90 steps pass.
  • deno task test:file src/platform/cloud/resolver.test.ts: 21 steps pass.
  • deno task typecheck, scoped deno fmt --check, and git diff --check pass.
  • AG-UI handler regression: 31 steps; runtime/detached handlers: 42 steps; release-version tests: 13 steps pass.
  • Full branch review identified lost model omission in AG-UI reconstruction. Fixed with a red/green restricted-handler regression and shared reconstruction handling; independent final diff review of omission tracking and all reconstruction paths found no correctness issues. The final CLI re-review could not authenticate (HTTP 401).
  • Broader project-agent test collection is blocked by a pre-existing unresolved veryfront/extensions/bundler import; changed handler tests and typecheck pass.
  • Registry and repository tag checks confirmed 0.1.1263 was unused before the bump; stable-release detection returns true for this change.

Summary by CodeRabbit

  • New Features

    • Cloud-hosted agents without an explicitly selected model now default to Mistral Small 3.1 (mistral/mistral-small-2503).
    • Direct-credential setups continue using openai/gpt-5.4-nano unless configured otherwise.
    • Omitted model selections are preserved consistently across streaming, multi-agent, and AG-UI executions.
    • Added documentation for configuring delegated agents and clarified model-selection behavior.
  • Documentation

    • Updated provider, tools, memory, streaming, and multi-agent guides to reflect the revised defaults.
  • Chores

    • Updated the application version to 0.1.1263.

Final batch validation: full lint, the CI test-typecheck baseline (36 grandfathered files, zero new failures), source typecheck, 33 restriction steps, 31 handler steps, 3 execution-config steps, 23 catalog steps, 36 provider steps, and 5 routing steps pass. Provider tests verify actual outgoing endpoint URLs for both new identities. The restricted-default regression failed before its fix and passes afterward. Independent final diff review found no issue.

The final catalog inventory check covers every model in short, canonical, and Cloud-prefixed form. Both added models have explicit runtime output budgets; DeepSeek's 16,384-token budget is a conservative runtime policy, not a claimed provider maximum. Full impacted suites pass at the latest head: runtime 597 tests / 1021 steps and Cloud provider 6 tests / 92 steps. Full lint, source typecheck, and the CI test-typecheck baseline pass. Independent cross-inventory review found no additional inference blocker.

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Codex Review Summary

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📝 Code Review ✅ Completed 2026-09-22T15:43:03.172696Z 52ae4c4 Manual request
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Review in Change Stack →

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📝 Walkthrough

Walkthrough

The change makes hosted model resolution default to mistral/mistral-small-2503, preserves omitted models through agent runtime rebuilding, updates related documentation and tests, and increments the project version to 0.1.1263.

Changes

Hosted model defaults

Layer / File(s) Summary
Model default resolution
src/agent/runtime/model-resolution.ts, src/platform/cloud/resolver.ts, src/provider/veryfront-cloud/model-catalog.data.ts, src/agent/runtime/model-resolution.test.ts, src/provider/veryfront-cloud/model-catalog.test.ts
Hosted omitted models now resolve to mistral/mistral-small-2503. Direct auto resolution reads VERYFRONT_DEFAULT_MODEL and retains direct-provider precedence.
Omitted model configuration
src/agent/runtime/execution-config.ts, src/agent/runtime/execution-config.test.ts, src/agent/factory.ts, src/agent/factory.test.ts
Agent creation records omitted models. Execution configuration restores omission when the model remains unchanged.
Runtime and AG-UI integration
src/agent/project/agent-runtime.ts, src/internal-agents/run-stream.ts, src/agent/ag-ui/*
Runtime cloning, streaming, detached execution, and AG-UI restriction paths use normalized execution configuration. Tests cover hosted model resolution through these paths.
Model selection documentation
docs/guides/*.md, src/agent/types.ts
Guides and AgentConfig.model documentation describe hosted defaults, direct defaults, omitted models, delegates, and VERYFRONT_DEFAULT_MODEL.

Release version

Layer / File(s) Summary
Version metadata
deno.json, src/utils/version-constant.ts
The project version changes from 0.1.1262 to 0.1.1263.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant Agent
  participant RuntimeResolution
  participant VeryfrontCloud
  participant RuntimeClone
  Agent->>RuntimeResolution: resolve omitted model
  RuntimeResolution->>VeryfrontCloud: read hosted default
  VeryfrontCloud-->>RuntimeResolution: veryfront-cloud/mistral/mistral-small-2503
  RuntimeResolution-->>RuntimeClone: provide execution model
  RuntimeClone-->>Agent: build runtime configuration
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Merge Risk: 🟡 Moderate · up to 71e96

Add the required system values to the new test fixtures before merging so the test suite type-checks.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name Status Explanation Resolution
Docstring Coverage ⚠️ Warning Docstring coverage is 26.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 15 functions across 18 files. (6 skipped:… Write docstrings for the functions missing them to satisfy the coverage threshold.
✅ Passed checks (4 passed)
Check name Status Explanation
Linked Issues check ✅ Passed Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check ✅ Passed Check skipped because no linked issues were found for this pull request.
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check ✅ Passed The title accurately identifies the hosted-default changes and the 0.1.1263 release. It is concise and related to the primary changes.
Full details: Docstring Coverage

Explanation

Docstring coverage is 26.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 15 functions across 18 files. (6 skipped: 6 unsupported.)

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📦 Client bundle boundary

Entrypoint Modules Source size Server leaks
src/index.client.ts 291 2332 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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Review: 32/100 — significant concern: the fix appears to miss the primary hosted execution path

Summary: The execution-config.ts mechanism (WeakMap-tagging a config object so an omitted model can be "restored" to undefined when a runtime is rebuilt from agent.config) is applied to the four AG-UI reconstruction sites, but the same stale-resolved-model bug still looks reachable through src/internal-agents/run-stream.ts, which is the hosted chat-runtime path used by server/handlers/request/agent-stream.handler.ts and agent/hosted/default-chat-runtime.ts — i.e. the actual "hosted EU inference" path this PR is meant to fix.

Why I think this is still broken

  • src/agent/factory.ts:227-232 — agentInstance.config (what callers see as agent.config) is a fresh object spread from publicConfig, where model: resolveConfiguredAgentModel(config.model) has already resolved an omitted model into a concrete string (e.g. openai/gpt-5.4-nano) using whatever Cloud/request context was active at agent-definition time.
  • For a project agent defined once at module load (export default agent({...}), no model) and reused across requests via getAgent(id) (see agent-stream.handler.ts:1202), that resolution happens before any per-request runWithVeryfrontCloudContext(...) scope exists, so it resolves to the old default, not Mistral.
  • run-stream.ts:1217-1266 builds runtimeAgent.config by spreading ...agent.config directly and constructs new AgentRuntime(runtimeAgent.id, runtimeAgent.config, ...) — it never calls the new getAgentExecutionConfig() helper that the four other call sites (ag-ui/detached-start.ts, ag-ui/handler.ts ×2, ag-ui/runtime-handler.ts, project/agent-runtime.ts) were updated to use.
  • Since agent.config.model here is an explicit string like "openai/gpt-5.4-nano" (not undefined), resolveRuntimeModel() no longer takes the model === undefined && isVeryfrontCloudEnabled() branch added in model-resolution.ts; it instead treats it as an explicit hosted-provider selection and can route it through veryfront-cloud/openai/gpt-5.4-nano — the exact model the EU hosted policy rejects, which is the bug this PR sets out to fix.
  • No test in this PR exercises run-stream.ts / the hosted chat-runtime path with an omitted model + Cloud context attached after agent construction (all the new regression tests target AG-UI handlers and the factory's direct agent.generate() path, where the raw runtimeConfig.model is passed through unresolved and doesn't hit this bug).

If run-stream.ts is in fact never reached with a long-lived registered agent in production (e.g. always via createEphemeralAgentWithRuntimeOptions under an already-active Cloud context), this concern doesn't apply — worth confirming explicitly, since the PR description says "Full branch review identified lost model omission in AG-UI reconstruction," which suggests reconstruction sites were audited but this one wasn't caught.

Other notes

  • Design of execution-config.ts (tag a config object via WeakMap, restore model: undefined when unchanged since registration) is a reasonable way to preserve "omitted" intent without changing the public resolved config shape, and is well unit-tested for the cases it covers (execution-config.test.ts).
  • model-resolution.ts changes (resolveConfiguredAgentModel, resolveRuntimeModel now special-casing model === undefined && isVeryfrontCloudEnabled(), and the VERYFRONT_DEFAULT_MODEL env override now applying to omitted models too) look correct in isolation and are covered by updated tests.
  • Docs (providers.md) and AgentConfig.model JSDoc are updated consistently with the new default semantics.
  • Version bump + hydration regen bundled into the fix is consistent with this repo's release convention per the PR description.
  • PR body is thorough and candid about validation gaps (blocked broader test collection, unauthenticated final CLI re-review) — appreciated, but given those gaps, please double check the run-stream.ts path in the same "attach Cloud context after construction" style as the new AG-UI regression test.

Suggested fix

Wrap the runtimeAgent.config used in the new AgentRuntime(...) construction at run-stream.ts:1256 with the same getAgentExecutionConfig(...) helper (or restructure runtimeAgent.config's base to build on getAgentExecutionConfig(agent.config) instead of agent.config directly), and add a regression test analogous to the AG-UI one but through the hosted chat-runtime/run-stream path.


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Actionable comments posted: 1


  • 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In `@src/agent/runtime/execution-config.test.ts`:
- Line 13: Add the required system field to both AgentConfig test fixtures,
including the config declarations used by the affected calls, while preserving
their existing model values.

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Reviewing files that changed from the base of the PR and between 1025864 and 71e9628.

⛔ Files ignored due to path filters (1)
  • src/html/hydration-script-builder/hydration-runtime.generated.ts is excluded by !**/*.generated.*
📒 Files selected for processing (24)
  • deno.json
  • docs/guides/agents.md
  • docs/guides/memory-and-streaming.md
  • docs/guides/multi-agent.md
  • docs/guides/providers.md
  • docs/guides/tools.md
  • src/agent/ag-ui/detached-start.ts
  • src/agent/ag-ui/handler.test.ts
  • src/agent/ag-ui/handler.ts
  • src/agent/ag-ui/runtime-handler.ts
  • src/agent/factory.test.ts
  • src/agent/factory.ts
  • src/agent/project/agent-runtime.ts
  • src/agent/runtime/execution-config.test.ts
  • src/agent/runtime/execution-config.ts
  • src/agent/runtime/model-resolution.test.ts
  • src/agent/runtime/model-resolution.ts
  • src/agent/types.ts
  • src/internal-agents/run-stream.test.ts
  • src/internal-agents/run-stream.ts
  • src/platform/cloud/resolver.ts
  • src/provider/veryfront-cloud/model-catalog.data.ts
  • src/provider/veryfront-cloud/model-catalog.test.ts
  • src/utils/version-constant.ts

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@kwakayama kwakayama changed the title fix(agent): use Mistral for hosted defaults and release 0.1.1263 fix(cloud): release EU model support and hosted defaults in 0.1.1263 Sep 22, 2026

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@kwakayama
kwakayama added this pull request to the merge queue Sep 22, 2026
Merged via the queue into main with commit 8f1cd57 Sep 22, 2026
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kwakayama deleted the fix/phase1-hosted-default branch September 22, 2026 16:07
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