fix(server): hide Claude models the installed CLI is too old for

[Gigioxx]

Problem

On Claude Code older than a model's minVersion, the model picker still offers that model. With Claude Code 2.1.278, T3 Code lists Opus 5.5 (it needs 2.1.280), and sending a turn with it fails with API Error: 400 Claude Code 2.1.278 does not support this model; version 2.1.280 or newer is required.

The Claude probe already filters the catalog by the installed version, and its status message says the CLI is too old. The provider registry then put the model back. shouldRetainMissingProviderModels retains missing models for every driver except Codex, OpenCode and Antigravity. The pending startup snapshot lists the whole catalog, so when the real probe finished, every model it had filtered out was appended again and saved to the provider cache.

Change

Claude now joins Codex and OpenCode: a finished probe is its model inventory. Pending and failed probes still keep the previous models, so the picker doesn't empty out while Claude starts up or a probe fails.

Cursor and Grok keep the current behavior. I didn't check that their probes return a complete list.

Scope and approval

No prior issue. This is a small, focused fix for an obvious bug: the Claude probe already decides which models the installed CLI supports, and the registry retention rule was undoing that decision, so the picker offered models that fail on every send. The fix only adds Claude to the existing list of drivers whose finished probe is authoritative.

Verification

• Reproduced in an isolated dev server with a Claude Code 2.1.278 binary: Opus 5.5 was offered and a turn with it failed with the 400 above. After the fix, the same setup no longer offers it.
• New ProviderRegistry.test.ts case: a ready Claude snapshot drops a model that only the pending snapshot had. It fails on main and passes with the fix.
• vp test run on ProviderRegistry.test.ts and providerStatusCache.test.ts passes. Scoped server typecheck, lint and format are clean.
• Not covered: when claude --version itself fails, the probe returns the full catalog with the provider in an error state, so no turn can start. That path is unchanged here.

Before	After

Changes made by Claude Opus 5.5 in Claude Code, running in T3 Code.

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📝 Walkthrough

Walkthrough

The provider registry now applies probe-state checks when deciding whether to retain missing Claude models. A test covers a pending-to-ready transition where the ready snapshot contains fewer models.

Changes

Claude provider model merging

Layer / File(s)	Summary
Probe-state model merging apps/server/src/provider/Layers/ProviderRegistry.ts, apps/server/src/provider/Layers/ProviderRegistry.test.ts	claudeAgent now follows probe-state checks when deciding whether to retain missing models. The test checks that a ready snapshot with CLI version 2.1.0 returns its model list instead of retaining a model from the pending snapshot.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix

Suggested reviewers: juliusmarminge

Merge Risk: 🟡 Moderate · up to 0428a

Unsupported Claude models can reappear after a probe failure and fail when selected. Preserve the filtered inventory on failure before merging.

Security Architecture Review

Security architecture risk: 🟡 Moderate · up to 0428a

The model-list fix narrows unsupported choices, but the change also enables clients to trigger an account-affecting action. Who can invoke that action should be confirmed before its exposure is treated as safe.

Retained concerns

• Medium · security · inferred: The newly enabled Claude reset-credit operation lets a client of the existing provider method initiate an account-affecting request using server-held credentials. The method checks instance availability, but the evidence does not establish which callers are authorized to spend credits for that instance.

Security review details

Security Blast Radius

• inferred — The new account-affecting path is scoped to a selected, enabled provider instance and its configured local credentials. Its independently reachable scope depends on who can call the existing WebSocket method.

Security Findings and Attack Paths

• inferred — A caller able to invoke the provider reset-credit method can request redemption for an enabled Claude instance. The observed handler checks instance state, but caller authorization outside that handler remains unverified; unauthorized redemption is not established.

Trust Boundaries and Controls

• observed — The client supplies an instance selection, not the token or request destination. The server reads credentials locally, uses a fixed remote host, validates claim identifiers, and serializes claims for the account key.

Resilience and Maintainability Implications

• inferred — Unsettled failures retain the same request ID during the process lifetime, limiting duplicate claims on retry. Whether an interrupted claim can be safely reconciled after restart remains unknown because the coordinator state is in memory.

Hardening Proposals

• proposed — Confirm that the WebSocket caller authorization boundary permits spending credits for the selected instance; if access is broader, enforce that authority before redemption.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2…
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	The description includes all required sections: Problem, Change, Scope and approval, and Verification. It explains the bug, the implementation, test coverage, manual verification, limitations, and bef…
Title check	✅ Passed	The title is concise, specific, and accurately describes the primary change: hiding Claude models unsupported by the installed CLI version.

✨ Finishing Touches

🧪 Generate unit tests (beta)

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Actionable comments posted: 1

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Inline comments:
Review comments at @apps/server/src/provider/Layers/ProviderRegistry.ts:
- Line 112: Update checkClaudeProviderStatus and its mergeProviderModels flow so
an installed CLI version-probe failure preserves the previously filtered
non-custom inventory instead of merging the full catalog; still apply current
custom-model settings, and ensure the cache fallback cannot restore unsupported
catalog models.

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ℹ️ Review info

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📥 Commits

Reviewing files that changed from the base of the PR and between ed57bed and 0428a85.

📒 Files selected for processing (2)

• apps/server/src/provider/Layers/ProviderRegistry.test.ts
• apps/server/src/provider/Layers/ProviderRegistry.ts

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Approvability

Verdict: Approved at 0428a85

Macroscope's review found this PR approvable — This is a narrowly scoped server bug fix that makes Claude’s already-version-filtered probe results authoritative after a successful check, preventing unsupported models from appearing in the picker. It includes a focused regression test and does not alter schemas, defaults, deployment behavior, or static-analysis configuration.

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[juliusmarminge]

Note

Grok responding on behalf of Julius.

Closing as superseded by #17307 (feat(models): tell users when a CLI update unlocks a new model), which landed on main.

That PR covers the same registry-retain / pending-snapshot leak that let CLI-gated Claude models back into the picker, and goes further: gated models are reported in updateRequiredModels with an explicit “update CLI to unlock” notice in the web and mobile pickers (plus Codex minVersion gating), instead of only hiding them.