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fix(server): Claude threads in a 200K window compact when idle - #31455
With CLAUDE_CODE_DISABLE_1M_CONTEXT=1, Claude Code runs Opus 5.5 with a 200,000-token window and reports contextWindow: 200000 in each result's modelUsage. T3 still measured the thread against the catalog's 1,000,000 tokens. Its idle compaction and the stale-thread Compact chip also only act at 200,000 used tokens, and a 200K window never gets there, because Claude auto-compacts near 167K. So an idle thread at ~160K was never compacted, and the resumed turn failed at once with blocking_limit.
Reproduced on main (337c585): a fresh dev server started with the env var, then one Opus 5.5 turn from the web UI. The provider turn was stored with maxTokens: 1000000, while the same Claude Code reports a 200,000 window.
Change
Window source (two commits cherry-picked unchanged from https://git.cafe/pingdotgg/t3code/pulls/31370 by @vladikkuzn, authorship kept): the Claude adapter prefers the window the session's own Claude process reports over the bundled catalog, and keeps those reports per session. The catalog is only the fallback until the session's first result.
Compaction minimum:compactionSuggestionMinTokens(maxTokens) in @t3tools/shared/claudeCompaction replaces the fixed 200,000 constant. It keeps 200,000 for 1M windows and when the window is unknown. Smaller windows use half the window, never below 100,000 (Claude Code's own idle-compaction floor), so a 200K window compacts from 100K. Server idle compaction, the web Compact chip and compact-before-send (web and mobile) all call it with the turn's reported maxTokens.
The two settings descriptions and the Claude user guide now name the 100,000 minimum for 200K windows.
Red first: at a7b7108 (tests only), both new tests fail; at the head, they pass.
apps/server/src/orchestration-v2/IdleCompaction.test.ts › "compacts a thread at 160K of a 200K window, which Claude never lets reach 200K": on main AssertionError: expected undefined to be 'run-1'.
packages/client-runtime/src/state/contextWindow.test.ts › shouldCompactBeforeSend "a stale Claude thread at 160K of a 200K window": on main expected false to be true. A row for "250K of a 1M window" covers the 200K cap.
ClaudeAdapterV2.test.ts: the cherry-picked tests (reported window over catalog, another model's report ignored, per-session isolation) pass, along with the full adapter suite (329 tests).
vp run check:changed: format, lint, knip, typecheck of affected packages, tests beside changes and the React compiler check all pass.
Runtime transcript, real app (Linux, Claude Code 2.1.304, fresh dev databases with T3CODE_DEV_SEED=0, server started with CLAUDE_CODE_DISABLE_1M_CONTEXT=1, one Opus 5.5 turn "Reply with exactly OK" sent from the web UI):
# What the CLI reports
CLAUDE_CODE_DISABLE_1M_CONTEXT=1 claude -p … --model claude-opus-5-5 → modelUsage.contextWindow 200000
claude -p … --model claude-opus-5-5 → modelUsage.contextWindow 1000000
# Before, main 337c5858c3: stored provider turn tokenUsage
{"usedTokens":34842,"maxTokens":1000000,…,"promptCacheTtlMs":3600000}
# After, this branch: same driver, fresh database
{"usedTokens":34813,"maxTokens":200000,…,"promptCacheTtlMs":3600000}
No render path changes. The existing chip shows in more cases and the meter gets the corrected maximum, so the proof is the tests plus this transcript, not captures.
Not checked: a full overnight idle-compaction run at ~160K against a live Claude session (the 1h prompt-cache window and ~160K of context make that impractical here; the server and client gates are covered by the tests above). Threads already stored with maxTokens: 1000000 keep the 200K minimum until their next turn reports the real window.
AI-assisted; verified with the tests and tools listed above.
…forces
The meter preferred the bundled catalog window over the contextWindow that
Claude Code reports per model in result.modelUsage, so a user with
CLAUDE_CODE_DISABLE_1M_CONTEXT saw Opus 5.5 measured against 1M (and an
auto-compact threshold derived from autoCompactWindow) while Claude Code
blocked the turn near its real 200k limit. The reported window for the
session's model now outranks the catalog; the catalog stays the fallback
until a result reports one.
Implemented with Claude Opus 5.5 via Claude Code (T3 Code).
The reported-window map lived at adapter level, so a session whose project
settings give a model 1M overwrote the 200k another session's Claude
process enforces, and that session's meter went back to the wrong window.
Each session now keeps the windows its own process reports, with the
catalog as fallback until its first result.
Implemented with Claude Opus 5.5 via Claude Code (T3 Code).
Claude Code with CLAUDE_CODE_DISABLE_1M_CONTEXT=1 runs in a 200K window and
auto-compacts near 167K, so a thread never reaches the fixed 200K minimum that
gates idle compaction and the Compact suggestion. These tests show a 160K-of-200K
thread gets neither.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Idle compaction and the stale-thread Compact suggestion only acted at 200K
tokens, which a 200K-window Claude session never reaches: Claude Code
auto-compacts near 167K and blocks prompts past its limit, so the resumed turn
failed with blocking_limit instead. The minimum now scales with the window the
turn reports: 200K for 1M windows and unknown windows, otherwise half the
window but at least Claude Code's 100K idleCompaction floor.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Macroscope's review found this PR requires human approval — Claude threads using a 200K window become eligible for compaction at 100K tokens instead of 200K. This changes default resume behavior and requires a human decision on earlier conversation summarization.
You can add or adjust custom eligibility rules. Learn more.
No actionable comments were generated in the recent review.
Walkthrough
Claude-reported context windows are tracked per session. Resume and idle compaction thresholds are calculated from the available context window. Resume compaction is also blocked while a provider handoff is pending. Tests and setting descriptions reflect these changes.
Changes: Context windows and compaction
Layer / File(s)
Summary
Session-scoped Claude context windows apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.ts, apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.test.ts
Reported Claude context windows override catalog values for the session that reports them. Tests check initial and reported values, including separate windows across sessions.
The shared threshold is half of a positive maximum token count, bounded from 100,000 to 200,000. Missing or non-positive capacity uses 200,000. Resume and idle compaction use the derived threshold. Resume compaction requires no pending provider handoff. Tests and setting descriptions cover 200K and 1M context windows.
pingdotgg/t3code#22318 — Both changes affect the catalog context-window value used by the Claude adapter.
pingdotgg/t3code#28024 — Both changes affect the context-window value used for Claude routes, including 1M routes.
pingdotgg/t3code#31370 — This PR changes the adapter to prefer each session’s reported context window over its catalog value, the same behavior described here.
Suggested reviewers:shivamhwp, t3dotgg
Merge Risk: Minimal · up to 33e03
No actionable issue is established that should prevent merging after normal checks.
Pre-merge checks: 4
Check name
Status
Explanation
Title check
The title clearly identifies the main change: enabling idle compaction for Claude threads with a 200K context window.
Description check
The description covers the problem, changes, scope, and focused verification results. It also states a live overnight check was not performed. The only minor gap is that it says AI was used but does n…
Linked Issues check
[#31441] ClaudeAdapterV2 now prefers each session’s reported context window over the catalog and keeps reports per session. compactionSuggestionMinTokens(maxTokens) sets a 100,000-token threshold …
Out of Scope Changes check
The adapter, threshold calculation, caller updates, tests, and documentation support [#31441]. The pendingHandoff guard changes eligibility for the same resume-compaction chip and prevents offering …
Full details: Description check
Explanation
The description covers the problem, changes, scope, and focused verification results. It also states a live overnight check was not performed. The only minor gap is that it says AI was used but does not name the model and harness as the template requests.
Full details: Linked Issues check
Explanation
[#31441] ClaudeAdapterV2 now prefers each session’s reported context window over the catalog and keeps reports per session. compactionSuggestionMinTokens(maxTokens) sets a 100,000-token threshold for a 200,000-token window and retains 200,000 for 1M or unknown windows. Server idle compaction and stale-thread compact-before-send use this threshold. The added tests cover reported-window precedence, session isolation, and compaction at 160,000 of 200,000 tokens. The supplied verification reports that these tests pass.
Full details: Out of Scope Changes check
Explanation
The adapter, threshold calculation, caller updates, tests, and documentation support [#31441]. The pendingHandoff guard changes eligibility for the same resume-compaction chip and prevents offering it during a provider handoff. No unrelated change is demonstrated.
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Actionable comments posted: 1
Fix comments: Fix CodeRabbit comments on this PR
Prompt to fix all issues
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only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @apps/web/src/components/ChatView.tsx:
- Line 2494: Update the resume-compaction eligibility logic in ChatView to
require pendingHandoff === null, matching the guard in shouldCompactBeforeSend.
Do not offer the Compact chip while a provider handoff is pending, even when
activeContextWindow.maxTokens exceeds the resume-compaction threshold.
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Environment for every capture: real web development app and server, Linux x86_64, Chromium 157, 1280×800 CSS viewport, DPR 2, light theme. Separate worktrees and fresh databases; identical synthetic data; real Claude turns. Runtime-selection identifiers are hidden or covered by gray rectangles.
Disable the 1M context window and complete a READY turn with identical synthetic instructions, using approximately 152K tokens.
Wait the actual one-hour cache TTL. With Before the cache expires, observe the scheduled pre-expiry window.
With When you return, append the same instruction-file marker after expiry, type Reply with RETURNED only. Do not use tools. and press Enter on both sides.
Automatic compaction starts two minutes before expiry and reduces context to 5.50K. Scheduled recording.
The scheduled recorder discarded unchanged trailing time: approximately 232 seconds of recording produced a 0.92-second base clip and a 104-second head clip. Settled screenshots and the runtime transcript establish the final states and actual timestamps. Resume recordings include typing, submission and outcome.
AI-assisted; verified with the tests and tools listed above.
Not shown:
The exact 100,000-token eligibility boundary was not exercised; the matched real sessions used approximately 152,000 tokens, between the new and old thresholds.
Continuous wall-clock coverage of the scheduled observation window is unavailable because the recorder discarded unchanged trailing time; automatic compaction and settled states were observed and captured.
Native desktop and mobile clients were not exercised; evidence covers the real server and web client.
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bugfixFix PR opened by an issue lead; enters the PR looppr:needs-juliusNeeds Julius: route gate, unverifiable surface, or blockedsize:M30-99 changed lines (additions + deletions).vouch:trustedPR author is trusted by repo permissions or the VOUCHED list.
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Problem
With
CLAUDE_CODE_DISABLE_1M_CONTEXT=1, Claude Code runs Opus 5.5 with a 200,000-token window and reportscontextWindow: 200000in each result'smodelUsage. T3 still measured the thread against the catalog's 1,000,000 tokens. Its idle compaction and the stale-thread Compact chip also only act at 200,000 used tokens, and a 200K window never gets there, because Claude auto-compacts near 167K. So an idle thread at ~160K was never compacted, and the resumed turn failed at once withblocking_limit.Reproduced on main (337c585): a fresh dev server started with the env var, then one Opus 5.5 turn from the web UI. The provider turn was stored with
maxTokens: 1000000, while the same Claude Code reports a 200,000 window.Change
compactionSuggestionMinTokens(maxTokens)in@t3tools/shared/claudeCompactionreplaces the fixed 200,000 constant. It keeps 200,000 for 1M windows and when the window is unknown. Smaller windows use half the window, never below 100,000 (Claude Code's own idle-compaction floor), so a 200K window compacts from 100K. Server idle compaction, the web Compact chip and compact-before-send (web and mobile) all call it with the turn's reportedmaxTokens.If https://git.cafe/pingdotgg/t3code/pulls/31370 lands first, merging main reduces this PR to the compaction-minimum change.
Scope and approval
Fixes #31441
Verification
Red first: at a7b7108 (tests only), both new tests fail; at the head, they pass.
apps/server/src/orchestration-v2/IdleCompaction.test.ts› "compacts a thread at 160K of a 200K window, which Claude never lets reach 200K": on mainAssertionError: expected undefined to be 'run-1'.packages/client-runtime/src/state/contextWindow.test.ts›shouldCompactBeforeSend"a stale Claude thread at 160K of a 200K window": on mainexpected false to be true. A row for "250K of a 1M window" covers the 200K cap.ClaudeAdapterV2.test.ts: the cherry-picked tests (reported window over catalog, another model's report ignored, per-session isolation) pass, along with the full adapter suite (329 tests).vp run check:changed: format, lint, knip, typecheck of affected packages, tests beside changes and the React compiler check all pass.Runtime transcript, real app (Linux, Claude Code 2.1.304, fresh dev databases with
T3CODE_DEV_SEED=0, server started withCLAUDE_CODE_DISABLE_1M_CONTEXT=1, one Opus 5.5 turn "Reply with exactly OK" sent from the web UI):No render path changes. The existing chip shows in more cases and the meter gets the corrected maximum, so the proof is the tests plus this transcript, not captures.
Not checked: a full overnight idle-compaction run at ~160K against a live Claude session (the 1h prompt-cache window and ~160K of context make that impractical here; the server and client gates are covered by the tests above). Threads already stored with
maxTokens: 1000000keep the 200K minimum until their next turn reports the real window.AI-assisted; verified with the tests and tools listed above.