fix(agent): read the claude context window from the cli by puemos · Pull Request #126084 · PostHog/posthog

puemos · 2026-10-30T06:23:22Z

Problem

PostHog Desktop users see the context marker go far over 100%. The size came from gateway data.
Split from #125385.

Changes

The window now comes from the Claude CLI. The gateway value is only the start value.
A 200k choice sets CLAUDE_CODE_DISABLE_1M_CONTEXT, which the CLI reads live.
A window choice stays across model switches.
The legacy 1M beta is gone.
Own-subscription sessions load the gateway model list without the token.
Codex and Pi already show the window their runtime enforces.

flowchart LR
  subgraph Before
    G1[Gateway context_window]:::phRed --> S1[Displayed size]:::phYellow
    B1[1M beta, query rebuild]:::phGray --> C1{{CLI window}}:::phBlue
  end
  subgraph After
    E2[CLAUDE_CODE_DISABLE_1M_CONTEXT]:::phGray --> C2{{CLI window}}:::phBlue
    C2 -- getContextUsage --> S2[Displayed size]:::phYellow
  end
  classDef phBlue fill:#1d4aff,stroke:#1d4aff,color:#fff;
  classDef phRed fill:#f54e00,stroke:#f54e00,color:#fff;
  classDef phYellow fill:#f9bd2b,stroke:#f9bd2b,color:#000;
  classDef phGray fill:#e5e7eb,stroke:#c7ccd1,color:#000;

How did you test this code?

A new agent case covers a gateway that reports 200K for Opus 5.5.
The real CLI, against a fake API, switches the window both ways live.
Not checked: a live session with model access.

Release status

No feature flag controls this change

Docs update

None.

🤖 Agent context

Autonomy: Human-driven (agent-assisted)

Agent: PostHog Desktop (Claude Code), Claude Opus 5.5

Skills: /writing-tests, /writing-pr-descriptions

More context for AI agents

Decisions: the CLI is the single source for the window, as in upstream claude-agent-acp and the Codex adapter. A catalog table was tried and dropped, because it is a second copy that can drift from the CLI and the account. applyFlagSettings({ env }) overrides the spawn env.
CI report: the eager graph row over budget shows no change against master, so this PR does not add to it. The Trunk lane note only names the merge lane. Bundle size shows no change.
Follow-ups: none known.
Read closely: modelsGatewayUrl in agent.ts and agent-server.ts sends a tokenless model list request to the PostHog gateway in subscription mode.

Created with PostHog Desktop

🤖 Generated with Claude Code

A Claude subscription session had no gateway URL, so the agent never loaded the model list. Every model then got the default 200K window, while the SDK ran 1M-capable models with the 1M beta. The compaction marker showed values far above 100% of context. The agent now reads the model list from the PostHog gateway in subscription mode too, without the PostHog token. Model calls still go to Anthropic. In this mode the picker keeps only Anthropic models. A session set to the 200K window no longer sends the 1M context beta, so the SDK and the app use the same window. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Generated-By: PostHog Desktop Task-Id: 80794e9d-ee42-425f-9286-770d4201111a

trunk-io · 2026-10-30T06:23:26Z

😎 Merged successfully - details.

github-actions · 2026-10-30T06:24:41Z

🤖 CI report

⚠️

Trunk lane — backend Python lane

This PR is assigned to the backend Python lane. It runs backend Python tests and may merge in parallel with PRs in other lanes.

✅ Complexity (TypeScript) — clean

Cyclomatic complexity above the limit in changed typescript files (10 for production files, 15 for test files). Warn only: worth simplifying when you next touch these functions.

✅ Duplication (Python) — clean

New Python code duplication introduced by this branch. Fails at 70+ tokens in app code, or 150+ tokens when both copies live in test files. Advisory while the gate proves itself: extract a shared helper instead of copying.

✅ Duplication (TypeScript) — clean

New TypeScript code duplication introduced by this branch. Fails at 70+ tokens in app code, or 150+ tokens when both copies live in test files. Advisory while the gate proves itself: extract a shared helper instead of copying.

✅ Bundle size — no change

Uncompressed size of every built .js bundle, compared against the base branch.

Total: 79.13 MiB · no change

No file changed by more than 1000 B.

_{Posted automatically by build-bundle-size-report · uncompressed bytes from dist-report}

⚠️

Eager graph — 1 over budget

How much code each root ships on the eager path — downloaded and parsed before the surface is interactive. Measured from the esbuild output chunks (post-tree-shake, static imports only); lazy import() / React.lazy chunks are not counted.

Root	Eager (shipped)	Δ vs base	Budget
entry (logged-out pages, app bootstrap) `src/index.tsx`	1.03 MiB · 25 files	no change	`█████████░` 90.1% of 1.14 MiB
logged-out boot: index + App + bootApp (preloaded by every page, including /login) `src/index.tsx + src/scenes/App.tsx + src/scenes/bootApp.ts`	3.00 MiB · 623 files	no change	`██████████` 99.0% of 3.03 MiB
🟡 authenticated shell (every logged-in page) `src/scenes/AuthenticatedShell.tsx`	7.12 MiB · 2,469 files	no change	`██████████` 100.2% of 7.10 MiB
dashboard scene `src/scenes/dashboard/Dashboard.tsx`	9.98 MiB · 3,738 files	no change	`██████████` 99.6% of 10.01 MiB
today home path `src/scenes/AuthenticatedShell.tsx + src/scenes/project-homepage/ProjectHomepage.tsx + src/scenes/project-homepage/today/TodayHome.tsx`	7.29 MiB · 2,557 files	no change	`██████████` 99.3% of 7.34 MiB
AI-first home path `src/scenes/AuthenticatedShell.tsx + src/scenes/project-homepage/ProjectHomepage.tsx + src/scenes/project-homepage/ai-first/AiFirstHomepage.tsx`	7.55 MiB · 2,556 files	no change	`██████████` 99.6% of 7.58 MiB
events scene `src/scenes/activity/explore/EventsScene.tsx`	9.41 MiB · 3,511 files	no change	`██████████` 98.1% of 9.59 MiB
web analytics scene `src/scenes/web-analytics/WebAnalyticsScene.tsx`	10.37 MiB · 3,778 files	no change	`██████████` 95.7% of 10.83 MiB
replay detail scene `src/scenes/session-recordings/detail/SessionRecordingDetail.tsx`	8.17 MiB · 3,026 files	no change	`█████████░` 86.3% of 9.47 MiB

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🟢 src/lib/components/ActivityLog/describers stays out of src/index.tsx
🟢 node_modules/@posthog/brand/dist/generated/hoggies/svg/ stays out of src/index.tsx
🟢 node_modules/@posthog/brand/dist/generated/hoggies/components/ stays out of src/index.tsx
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🟢 src/scenes/web-analytics/tiles/WebAnalyticsTile.tsx stays out of src/scenes/dashboard/Dashboard.tsx
🟢 src/queries/validators.js stays out of src/scenes/dashboard/Dashboard.tsx
🟢 src/scenes/project-homepage/ai-first/AiFirstHomepage.tsx stays out of src/scenes/AuthenticatedShell.tsx + src/scenes/project-homepage/ProjectHomepage.tsx + src/scenes/project-homepage/today/TodayHome.tsx
🟢 src/scenes/project-homepage/today/TodayReportPage.tsx stays out of src/scenes/AuthenticatedShell.tsx + src/scenes/project-homepage/ProjectHomepage.tsx + src/scenes/project-homepage/today/TodayHome.tsx
🟢 src/queries/Query/Query.tsx stays out of src/scenes/AuthenticatedShell.tsx + src/scenes/project-homepage/ProjectHomepage.tsx + src/scenes/project-homepage/today/TodayHome.tsx
🟢 packages/quill/packages/charts/ stays out of src/scenes/AuthenticatedShell.tsx + src/scenes/project-homepage/ProjectHomepage.tsx + src/scenes/project-homepage/today/TodayHome.tsx
🟢 products/posthog_ai/frontend/components/tool/widgets/VisualizationWidget.tsx stays out of src/scenes/AuthenticatedShell.tsx + src/scenes/project-homepage/ProjectHomepage.tsx + src/scenes/project-homepage/ai-first/AiFirstHomepage.tsx
🟢 products/posthog_ai/frontend/components/tool/widgets/RecordingsWidget.tsx stays out of src/scenes/AuthenticatedShell.tsx + src/scenes/project-homepage/ProjectHomepage.tsx + src/scenes/project-homepage/ai-first/AiFirstHomepage.tsx
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🟢 products/posthog_ai/frontend/api/primitives.ts stays out of src/scenes/AuthenticatedShell.tsx + src/scenes/project-homepage/ProjectHomepage.tsx + src/scenes/project-homepage/ai-first/AiFirstHomepage.tsx
🟢 src/scenes/notebooks/Notebook/notebookLogic.ts stays out of src/scenes/AuthenticatedShell.tsx + src/scenes/project-homepage/ProjectHomepage.tsx + src/scenes/project-homepage/ai-first/AiFirstHomepage.tsx
🟢 src/scenes/session-recordings/playlist/SessionRecordingsPlaylist.tsx stays out of src/scenes/activity/explore/EventsScene.tsx
🟢 src/scenes/web-analytics/tiles/WebAnalyticsTile.tsx stays out of src/scenes/activity/explore/EventsScene.tsx
🟢 src/queries/validators.js stays out of src/scenes/activity/explore/EventsScene.tsx
🟢 src/scenes/web-analytics/LiveMetricsDashboard/LiveWebAnalyticsMetrics.tsx stays out of src/scenes/web-analytics/WebAnalyticsScene.tsx
🟢 products/product_analytics/frontend/insights/trends/WorldMap/countryVectors.tsx stays out of src/scenes/web-analytics/WebAnalyticsScene.tsx
🟢 src/scenes/settings/SettingsMap.tsx stays out of src/scenes/session-recordings/detail/SessionRecordingDetail.tsx
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217.5 KiB	`../node_modules/.pnpm/@posthog+icons@0.39.0_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/@posthog/icons/dist/posthog-icons.es.js`
153.8 KiB	`../node_modules/.pnpm/re2js@0.4.1/node_modules/re2js/build/index.esm.js`
126.8 KiB	`../node_modules/.pnpm/react-dom@18.3.1_react@18.3.1/node_modules/react-dom/cjs/react-dom.production.min.js`
102.9 KiB	`src/products.tsx`
94.5 KiB	`../node_modules/.pnpm/@tiptap+core@3.20.6_@tiptap+pm@3.20.6/node_modules/@tiptap/core/dist/index.js`
92.5 KiB	`../node_modules/.pnpm/prosemirror-view@1.40.1/node_modules/prosemirror-view/dist/index.js`

_{Posted automatically by check-eager-graph · sizes are eager output bytes (shipped, post-tree-shake) from the esbuild metafile · part of #32479}

✅ Toolbar bundle — eager 2.34 MiB within budget

What the toolbar ships to customer pages, measured from the esbuild output (minified, post-tree-shake). The eager set is the entry plus everything statically imported from it — fetched before any feature runs; deferred chunks load lazily. The eager guardrail is 5.72 MiB. Each output file must also stay below 10 MB, where CloudFront stops compressing it. The module boundary is enforced separately by check-toolbar-graph.

Metric	Size	Δ vs base	Budget
Eager (shipped) entry + static imports	2.34 MiB · 19 files	no change	`████░░░░░░` 40.8% of 5.72 MiB
Deferred (lazy)	2.11 MiB · 42 files	no change	n/a — loads on demand
Loader `dist/toolbar.js`	1.2 KiB	no change	`█░░░░░░░░░` 6.0% of 19.5 KiB

Largest eagerly-shipped chunks

Size	File
941.1 KiB	`dist/toolbar/toolbar-app-6U6ENA2U.css`
695.9 KiB	`dist/toolbar/chunk-chunk-4H43LS5Z.js`
261.2 KiB	`dist/toolbar/chunk-chunk-XYBYKBEE.js`
131.8 KiB	`dist/toolbar/chunk-chunk-FDH2IBXT.js`
130.4 KiB	`dist/toolbar/chunk-chunk-LBEGWY4T.js`
75.7 KiB	`dist/toolbar/toolbar-app-F4A42KIJ.js`
69.0 KiB	`dist/toolbar/chunk-chunk-TSAL54PB.js`
35.6 KiB	`dist/toolbar/chunk-chunk-6IA6PKL4.js`
21.7 KiB	`dist/toolbar/chunk-chunk-WRHIFV3D.js`
6.8 KiB	`dist/toolbar/chunk-chunk-DV7IWQNF.js`

_{Posted automatically by check-toolbar-size · sizes are toolbar output bytes (shipped, post-tree-shake) from the esbuild metafile}

✅ Dist folder size — no change

Total size of the built frontend/dist folder (all assets), compared against the base branch.

Total: 988.31 MiB · no change

posthog

PostHog Review · Standard · reviewed 321ee36: 1 Should fix.

This is the only automatic review while this pull request is a draft. Comment @posthog review to review new changes sooner. Otherwise, a review of the new changes runs when you mark it ready for review.

See this review and its findings in PostHog Review. Comment @posthog review --deep for a Deep review. A Deep review takes longer and looks deeper than a Standard review.

posthog · 2026-10-30T06:25:51Z

PostHog Review · Deep · reviewed `770e721`

Posted 5 findings: 4 Should fix, 1 Consider.

Step	Status	Result
Prepare the diff	done	9 files, 1 chunk
Pick perspectives	done	3 perspectives
Run review passes	done	4 issues (+1 blind-spot)
Merge overlapping findings	done	5 → 5
Validate findings	done	5 kept, 0 dismissed
Publish	done	5 posted (view review)

hosthog · 2026-10-30T06:27:05Z

HostHog preview — `posthog-desktop-web`

The previews for this PR have been torn down and no longer serve.

The SDK reads betas only when a query starts. A session that started at 200K now runs without the 1M beta, so a later switch to 1M changed only the stored options while the running query stayed at 200K. The agent now records the betas of the running query. Before the next prompt, when no turn is in progress and the wanted betas differ, it rebuilds the query through the existing refresh path, which resumes the same conversation. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Generated-By: PostHog Desktop Task-Id: 80794e9d-ee42-425f-9286-770d4201111a

posthog

This is review round 3 on this pull request. When findings keep coming back in the same code, the approach is usually the problem. Before the next fix, check whether a different design would remove the whole class of findings.

…w from the cli Removing the 1M beta does not enforce 200K for models with native 1M context: with a Claude subscription, the CLI still runs them at 1M. CLAUDE_CODE_AUTO_COMPACT_WINDOW caps the window in both gateway and subscription mode, so a 200K session now sets it and every 1M-capable session keeps the beta, as before. The window the app reports now comes from the CLI's getContextUsage maxTokens, which includes the beta and the cap. It is read at session start, after a query rebuild, after a model switch, at the compaction boundary and after each turn. This replaces the step that raised the window to the model's modelUsage window, which ignores the cap. A context window change during a session compares both the betas and the cap before the next prompt. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Generated-By: PostHog Desktop Task-Id: 80794e9d-ee42-425f-9286-770d4201111a

… and flags The context window rebuild now starts a fresh query with the same session id when the session has no saved conversation yet (before the first prompt, or after /clear), instead of resuming a transcript that does not exist. It waits while a background turn runs, and it applies the effort and fast mode flags again on the rebuilt query, because those reach the CLI only through applyFlagSettings. The MCP refresh path keeps resuming as before. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Generated-By: PostHog Desktop Task-Id: 80794e9d-ee42-425f-9286-770d4201111a

posthog

This is review round 4 on this pull request. When findings keep coming back in the same code, the approach is usually the problem. Before the next fix, check whether a different design would remove the whole class of findings.

The model catalog now lists the context window sizes each model can run at. The Claude adapter reads the window and the 200k/1M options from it. A 200k choice sets CLAUDE_CODE_DISABLE_1M_CONTEXT, at spawn and live through applyFlagSettings, so a change needs no query rebuild. The legacy 1M beta and the rebuild path are removed. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Generated-By: PostHog Desktop Task-Id: 598ee58b-d15a-4d2e-8d7d-fd93c1720a53

The CLI applies the model, the account and the 200k cap, so it is the single source for the window. The adapter reads getContextUsage({ detail: "summary" }).rawMaxTokens after session start, a model switch and a window switch, and seeds from the gateway until it answers. The catalog window numbers are removed again, so no second copy can drift. A window choice now stays across model switches, like effort. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Generated-By: PostHog Desktop Task-Id: 598ee58b-d15a-4d2e-8d7d-fd93c1720a53

The test drives the real adapter and CLI: a 200k session reports 200k after a turn, and a live switch to 1m reports 1m. It fails on the code before this PR. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Generated-By: PostHog Desktop Task-Id: 598ee58b-d15a-4d2e-8d7d-fd93c1720a53

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Generated-By: PostHog Desktop Task-Id: 598ee58b-d15a-4d2e-8d7d-fd93c1720a53

A loaded session now reads the window from the CLI too. Without an explicit choice, the spawn env leaves CLAUDE_CODE_DISABLE_1M_CONTEXT as the user set it. A window read that a newer choice overtook is ignored. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Generated-By: PostHog Desktop Task-Id: 598ee58b-d15a-4d2e-8d7d-fd93c1720a53

Generated-By: PostHog Desktop Task-Id: 598ee58b-d15a-4d2e-8d7d-fd93c1720a53

parameterai · 2026-10-30T16:31:58Z

Risk: No findings

This change makes the Claude CLI the source of truth for the session context window (via getContextUsage and the CLAUDE_CODE_DISABLE_1M_CONTEXT env var), drops the legacy 1M beta, and adds a tokenless gateway model-list fetch for own-subscription sessions. I found no security vulnerabilities: the tokenless fetch sends no credentials, all env values written are constants, and the window size only feeds display/telemetry, not authorization or spend limits.

_{Sentinel reviewed 6c4948f · Review settings}

puemos · 2026-10-31T12:30:45Z

/trunk merge

deployment-status-posthog · 2026-10-31T13:14:19Z

Deploy status

Environment	Status	Deployed At	Workflow
dev	✅ Deployed	2026-10-31 13:14 UTC	Run
prod-us	✅ Deployed	2026-10-31 13:28 UTC	Run
prod-eu	✅ Deployed	2026-10-31 13:28 UTC	Run

puemos self-assigned this Oct 30, 2026

github-actions Bot added feature/agent-infra Feature Tag: Agent infra feature/desktop Feature Tag: Desktop labels Oct 30, 2026

puemos mentioned this pull request Oct 30, 2026

fix(desktop): stop the compaction spinner after a repeated start #125385

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posthog Bot reviewed Oct 30, 2026

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Comment thread packages/agent/packages/agent/src/adapters/claude/claude-agent.resume-model.test.ts Resolved

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Comment thread packages/agent/packages/agent/src/adapters/claude/session/options.ts Resolved

Comment thread packages/agent/packages/agent/src/adapters/claude/claude-agent.ts Resolved

Comment thread packages/agent/packages/agent/src/adapters/claude/claude-agent.ts Resolved

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Comment thread packages/agent/packages/agent/src/adapters/claude/claude-agent.ts Resolved

Comment thread packages/agent/packages/agent/src/adapters/claude/claude-agent.ts Resolved

Comment thread packages/agent/packages/agent/src/adapters/claude/claude-agent.ts Resolved

fuziontech mentioned this pull request Oct 30, 2026

perf(ci): stop checking out full history to gate the nodejs suite #126087

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posthog Bot reviewed Oct 30, 2026

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puemos changed the title ~~fix(desktop): use the real context window for claude sessions~~ fix(desktop): read claude context windows from the model catalog Oct 30, 2026

puemos changed the title ~~fix(desktop): read claude context windows from the model catalog~~ fix(desktop): read the claude context window from the cli Oct 30, 2026

puemos added 4 commits October 30, 2026 14:30

test(desktop): drop the context window e2e test

087a2b0

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Generated-By: PostHog Desktop Task-Id: 598ee58b-d15a-4d2e-8d7d-fd93c1720a53

Merge branch 'master' into posthog/fix-agent-context-window

6c4948f

Generated-By: PostHog Desktop Task-Id: 598ee58b-d15a-4d2e-8d7d-fd93c1720a53

puemos marked this pull request as ready for review October 30, 2026 16:31

pr-assigner-resolver-posthog Bot requested a review from a team October 30, 2026 16:32

puemos changed the title ~~fix(desktop): read the claude context window from the cli~~ fix(agent): read the claude context window from the cli Oct 30, 2026

github-actions Bot removed the feature/desktop Feature Tag: Desktop label Oct 30, 2026

charlesvien approved these changes Oct 31, 2026

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trunk-io Bot merged commit 3d30573 into master Oct 31, 2026
323 checks passed

trunk-io Bot deleted the posthog/fix-agent-context-window branch October 31, 2026 12:51

scheduled-actions-posthog Bot mentioned this pull request Oct 31, 2026

chore(tasks): bump sandbox @posthog/agent to 2.4.305 #126793

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