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fix(claude): apply custom model context allowances in the current adapter - #16732
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ApprovabilityVerdict: Not approved Macroscope's review found this PR not approvable — The PR adds an optional per-model context allowance to Claude Code queries and changes the existing fallback for unknown models from 200k tokens to no reported capacity. This cross-layer behavior and product-default change should receive human review. You can add or adjust custom eligibility rules. Learn more. |
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📝 WalkthroughWalkthroughCustom model definitions now support an optional context-window allowance. Settings updates preserve allowances under specified conditions. The Claude catalog and adapter use them to validate selections, configure query startup, and report context limits. ChangesCustom model context-window allowances
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant ClaudeDriver
participant ClaudeAdapterV2
participant ClaudeModelCatalog
participant ClaudeCode
ClaudeDriver->>ClaudeAdapterV2: Pass model catalog
ClaudeAdapterV2->>ClaudeModelCatalog: Resolve selected model allowance
ClaudeModelCatalog-->>ClaudeAdapterV2: Return context-window value
ClaudeAdapterV2->>ClaudeCode: Start query with context-token environment setting
Suggested reviewers: Merge Risk: 🔵 Low · up to Unrecognized model IDs can show a misleading 200,000-token context limit. Return unknown capacity for unresolved IDs while retaining the fallback for catalogued custom models. Architecture SummaryArchitecture risk: 🔵 Low · up to The change affects 5 systems. Changed systems: Architecture concerns Review detailsSystems and components
Before / after behavior
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at
@apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.ts:
- Line 148: Update CLAUDE_NATIVE_MODEL_ID to also match the reserved model
selections default, best, and fable, so claudeCustomContextWindowSelectionIssue
rejects custom entries using those slugs; extend the related transition test to
cover all three selections.
- Around line 896-900: Update makeClaudeQueryOptions when constructing
contextWindowSettings so a custom context window does not silently discard
string sdkSettings paths: load and merge the file settings before adding env if
supported, or explicitly reject this combination.
Review comments at @docs/user/providers-claude.md:
- Around line 58-60: Update the `customModels` documentation around
`contextWindowTokens` to name the actual supported settings control or
configuration path where users enter the allowance; verify the path from the
existing implementation rather than guessing, and distinguish it from the
general Settings > Providers instructions.
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📒 Files selected for processing (11)
apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.test.tsapps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.tsapps/server/src/provider/ClaudeModelCatalog.test.tsapps/server/src/provider/ClaudeModelCatalog.tsapps/server/src/provider/Drivers/ClaudeDriver.tsapps/web/src/components/settings/customModelEditor.logic.test.tsapps/web/src/components/settings/customModelEditor.logic.tsdocs/user/providers-claude.mdpackages/contracts/src/model.tspackages/shared/src/model.test.tspackages/shared/src/model.ts
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@coderabbitai review The older-client compatibility issue in the latest Approvability check is fixed in 2c21183. Server-side settings updates retain a saved contextWindowTokens value when an older client omits it for the same model ID in the same Claude instance. This covers full provider-instance map patches, per-instance mutations, legacy Claude settings edits and migration to the default instance. Explicit supplied values still replace the allowance; deleted models stay deleted and new model IDs, other instances and changed drivers do not inherit it. Direct settings-file edits can remove the field, as documented. Three tests reproduced the loss before the fix. All 293 focused context tests (including 67 settings tests) and the server typecheck pass. Independent high-effort Claude Opus review of this newest change is in progress; the preceding guard changes passed their independent review. Please re-evaluate the compatibility check on this revision. |
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@coderabbitai review The default-behavior concern is fixed in a4ce9d6. Models without a declared capacity retain the prior 200,000-token fallback; only an explicit custom allowance changes their reported capacity. Switching away starts a fresh query without the custom override. The regression expectation and user docs now match that preserved default. All 293 focused context tests pass. Independent Claude Opus 5.5 high-effort review passed this exact head with no material defects. Fresh real-client evidence is linked in the PR: native Claude 71k/1m → explicitly configured GPT Sol 40k/872k → unconfigured GPT Luna 41k/200k. The continuous 15-second recording and persisted turn data confirm the capacities after restarting the isolated server onto this final build. The previous compatibility fix and all three original findings are already addressed. Please re-evaluate Approvability on this revision. |
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at
@apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.ts:
- Line 159: Update the capacity fallback in ClaudeAdapterV2 so unresolved,
non-native model selections return null, while catalogued models without a
declared allowance and native model IDs retain the 200,000-token fallback.
Update the relevant test to assert null for an unresolved model and clarify in
the provider documentation that only catalogued custom models receive the
fallback.
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apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.test.tsapps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.tsdocs/user/providers-claude.md
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- docs/user/providers-claude.md
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What Changed
Custom non-Claude models run through Claude Code can declare a validated
contextWindowTokensallowance. The current Claude adapter applies it to each native query and reports that model's capacity in the context meter. Model changes use the existing V2 query restart path, so an allowance does not leak into the next model. Settings round-trips and model edits preserve it; server updates preserve the saved allowance for matching model IDs when older clients omit the field, including legacy settings, instance-map patches and per-instance mutations; user docs identify the environment settings file and exact entry to edit; Runtime-controlled Claude identifiers, native selections (includingdefault,bestandfable), provider-prefixed Claude IDs and IDs containing[1m]reject custom overrides. A string SDK settings-file path combined with a custom allowance is explicitly rejected, so its contents cannot be silently discarded; object settings and unrelated environment variables are preserved. Built-in models without catalog capacity retain their native 200k limit.Why
A router model may support more context than Claude Code's name-based default. Current main ignores a custom 872,000-token allowance and shows
40k/200kafter a real response. The configuration controls the existing custom-model capability and preserves automatic compaction and the separate compaction threshold.Replaces #14205. Its closing comment confirms this fits the focused configuration route and asks for before/after UI captures and a model-switch recording. Those are included below. This replacement is rebased onto upstream main
10f39eb9acand ports the fix to the current V2 adapter; it does not restore the removed V1 adapter.Verification
vp test run apps/server/src/serverSettings.test.ts apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.test.ts apps/server/src/provider/ClaudeModelCatalog.test.ts apps/web/src/components/settings/customModelEditor.logic.test.ts apps/web/src/lib/contextWindow.test.ts packages/shared/src/model.test.ts apps/server/src/claudeModelOptions.test.ts: 293 unique focused tests pass (166 adapter cases, 67 settings cases, 60 other cases), including native 200k fallback, reserved Claude selections, settings-file rejection, object-settings preservation, the unchanged unconfigured-model 200k fallback, settings-file passthrough without a custom allowance, and older-client settings round-trips. Three new settings tests reproduced allowance loss before the fix. Regression coverage verifies persisted values, legacy migration, explicit replacements, new/removed models, instance/driver isolation and removing the field directly from the settings file.a4ce9d6720(resolved modelclaude-opus-5-5[1m]), covering capacity validation, model-switch isolation, SDK settings preservation and older-client persistence.Models without a declared catalog capacity retain the prior 200,000-token fallback. Only selecting an explicit custom allowance changes that reported capacity; switching away clears the query override and restores normal model handling. Catalog absence does not make an opaque router model invalid: custom entries without capabilities or an allowance are not appended to that metadata catalog, and their IDs still pass through to Claude Code. The adapter uses the catalog captured when the provider instance is created; newly discovered metadata takes effect after the instance is rebuilt. This PR does not add per-turn catalog reads.
The existing V2 meter can briefly retain the previous turn's capacity while a model switch is pending; the captures below show completed responses from each target model.
Upstream CI and preview workflows are currently
action_required: GitHub requires maintainer approval for this fork contribution. Local verification does not replace that gate.The configured router does not serve
claude-haiku-4-5(400 unknown-provider response), so the restored older-model fallback is verified by focused adapter regression tests; the live capture covers Opus 5.5 and the two custom router models.UI Changes
Real-client verification of final source
a4ce9d6720on 2026-10-07: Node 24.21.0, Claude Code 2.1.292, Claude Agent SDK 0.3.276, isolated app state and a disposable Git project. The server was restarted before this capture to ensure it contains the final source. The existing context indicator was enabled in Settings → General → Legacy features. No projection replay or test-only source injection was used.Before: GPT Sol has an explicit
872000allowance, but the baseline context implementation displays40k/200kafter a real response. This baseline capture uses main365aa87982plus the unrelated SSH patch, with its unchanged context implementation.After: the configured model displays the declared
40k/872kcapacity after a real response.15-second model-switch recording: native Claude Opus 5.5 (
71k/1m) → GPT Sol with explicit allowance (40k/872k) → GPT Luna without an allowance (41k/200k). The unconfigured model retains the prior fallback, and each model produces a real provider response. Persisted V2 turn data confirms capacities of 1,000,000, 872,000 and 200,000 tokens.Capture procedure · Sanitized configuration and persisted usage.
Earlier unknown-capacity media in the verification release is historical; the linked opt-in recording above represents this final PR.
Checklist
Original implementation: GPT-6 Astra and GPT-5.6 Sol through the Codex harness. Current V2 port and replacement: GPT-5.6 Sol and GPT-6.1 Sol through Codex, independently reviewed by Claude Opus 5.5 at high effort.