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fix(server): resolve Claude WinGet launchers on Windows - #32138
On Windows, a claude.cmd in %LOCALAPPDATA%\Microsoft\WinGet\Links forwards to the native Claude executable in WinGet's package directory. The resolver only checks npm package entries beside the launcher, then hands claude back to the SDK. Provider capability initialization fails even though the native executable is installed and runnable.
Change
Recognize the reported two-line WinGet launcher at its known location and return the existing Claude package executable. Read LOCALAPPDATA from the supplied environment case-insensitively and keep its value literal. When launcher path spellings differ, compare their canonical paths so 8.3 names and directory junctions reach the same supported launcher. Unsupported commands, other package targets, unreadable launchers, and missing executables retain the existing fallback. Launcher contents are never executed.
Scope and approval
This qualifies as a small, focused fix for an obvious bug in the existing Windows Claude launcher resolver. It changes server-side executable discovery used by capability probes and the Claude adapter, including when clients connect remotely to a Windows environment. It adds no setting, client UI, or provider behavior outside this launcher case.
#24533 covers pnpm's different launcher format; this change addresses the documented WinGet case only and does not close the broader issue.
Verification
Environment: Windows x64, Node 26.12.1, locked Effect 4.1.2 and Claude Agent SDK 0.3.316, real Claude Code 2.1.319.
Baseline at 6577c6b6185167c0e502fa01f9e8e8f2dee6ff25, with the regression added first: from apps/server, vp test run src/provider/Drivers/ClaudeExecutable.test.ts -t "follows the WinGet launcher" --maxWorkers 1 failed: expected the package executable, received claude.
Fixed: from apps/server, vp test run src/provider/Drivers/ClaudeExecutable.test.ts src/provider/ClaudeCapabilitiesProbe.test.ts src/provider/AgentContextBudget.test.ts --maxWorkers 1 passed, 12 tests across three files. This includes both check:changed-selected test files and additional capability-probe coverage. The existing cases cover canonical paths, 8.3 names, junction aliases, distinct and unreadable paths, CRLF/LF, case-insensitive environment keys, literal $&/%name%, unsupported launcher forms, missing targets, and npm resolution.
vp fmt --check apps/server/src/provider/Drivers/ClaudeExecutable.ts apps/server/src/provider/Drivers/ClaudeExecutable.test.ts and vp lint with the same two paths passed.
All three affected-package typechecks passed: vp run --cache --parallel --concurrency-limit 1 --filter @t3tools/evals --filter @t3tools/scripts --filter t3 typecheck.
vp run --filter ./apps/server generate --check passed.
Both vp run knip:check:files and vp run knip:check:exports passed.
vp run check:changed --concurrency 1 was attempted but could not reach its check stages: on this Windows checkout, its ignored-input git ls-files scan follows nested pnpm workspace junctions and emits repeated Filename too long warnings (covered separately by #32023). The stalled scan was stopped after preserving its output. The individual commands above cover every check selected for these two changed files; the wrapper itself did not pass and its cache was not written.
The root Vitest launcher also tries to initialize an unrelated browser project on port 62126, inside this machine's Windows-excluded range 62059–62158 (EACCES, covered separately by #24007). Server tests ran through their owning apps/server configuration with the same selected files. No repository configuration or check was weakened to bypass these local tooling problems.
For end-to-end verification, created a fresh temporary Windows directory with the exact reported Links\claude.cmd and package layout, hard-linked the real installed Claude executable into it, and supplied an isolated Path, mixed-case LocalAppData, empty CLAUDE_CONFIG_DIR, and isolated home. Called the production probeClaudeCapabilities(settings, environment, fixtureDirectory, false) with binaryPath: "claude" and NodeServices.layer. This runs the real resolver, SDK, native child process, and initialization IPC. The probe's never-yielding prompt sends no model request; no live T3 state or Claude credentials were used.
Before:
native --version: exit 0, 2.1.319 (Claude Code)
probe: ClaudeCapabilitiesProbeSdkError
cause: Claude Code native binary not found at claude.
initialized: false
After:
native --version: exit 0, 2.1.319 (Claude Code)
initialized: true, slashCommands: 44, models: 5
noPromptSent: true, isolatedConfig: true
Separate Windows spawn transcript (node.exe as a deterministic fixture):
bare claude: ENOENT
absolute claude.cmd: EINVAL
resolver output before: ENOENT
resolver output after: native package executable, exit 0, v26.12.1
The review follow-up also reproduced the alias-path defect against 47cc26e: the extended existing regression returned claude instead of the package executable, and the real SDK capability probe failed with a junction on PATH. After the fix, both a real Windows junction and an actual 8.3 PATH initialized successfully (44 commands, five models each). Those runs used the same isolated native Claude/SDK workflow with no prompt or credentials. All selected individual checks were rerun for the follow-up.
The runtime check reproduces the WinGet layout with the installed native executable; it does not perform a new WinGet installation or a paid agent turn. No visual surface changed.
Implemented with OpenAI GPT-6 via the Codex harness.
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Macroscope's review found this PR approvable — This fixes Windows WinGet Claude launchers by resolving their native executable directly. Strict launcher-path, content, and file-existence checks limit the change while preserving existing resolution behavior elsewhere.
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No actionable comments were generated in the recent review.
Walkthrough
The Claude executable resolver now recognizes a supported Windows WinGet launcher and uses its packaged executable when available. If launcher validation or executable lookup fails, the resolver retains its existing fallback behavior.
Changes: Claude WinGet executable resolution
Layer / File(s)
Summary
WinGet launcher resolution and fallback apps/server/src/provider/Drivers/ClaudeExecutable.ts, apps/server/src/provider/Drivers/ClaudeExecutable.test.ts
The resolver validates the expected WinGet launcher path and contents, then uses the packaged executable if it exists. Tests cover launcher variants, unsupported or missing inputs, and filesystem errors.
pingdotgg/t3code#24293: This change handles the WinGet launcher format described in the issue, but not its pnpm launcher format.
Suggested reviewers:maria-rcks
Merge Risk: Minimal · up to 6957b
The reported WinGet launcher can resolve to the native Claude executable. No actionable merge-blocking risk remains after normal checks.
Pre-merge checks: 4
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The title clearly identifies the Windows Claude WinGet launcher resolution fix.
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The description includes all required sections. It explains the problem, fix, scope, verification results, and checks that could not be completed. It also identifies the model and harness.
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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/server/src/provider/Drivers/ClaudeExecutable.ts:
- Around line 42-43: Update the launcher comparison in the Claude capability
initialization flow to recognize when the resolved and expected WinGet launcher
paths refer to the same filesystem entry, including through 8.3 names or
junctions. Preserve the existing fallback that returns undefined when they
identify different launchers.
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Worker16 independent technical review — COMMENT, anchored to exact candidate HEAD 6957bcb198b07f2267841877ce7ccb841d8fa060 (PR #32138; author Sidreyas; target main, PR base SHA 6577c6b6185167c0e502fa01f9e8e8f2dee6ff25). This is a separate nonauthor review; no source/branch custody is claimed.
Scope inspected: exactly apps/server/src/provider/Drivers/ClaudeExecutable.ts and ClaudeExecutable.test.ts. I traced the production caller in ClaudeProvider.ts and the shared SpawnExecutableResolution contract.
Source assessment: the resolver is Windows-only; finds LOCALAPPDATA case-insensitively and rejects a missing/relative value; accepts only the expected WinGet Links launcher path (or a path whose native realpath matches it); reads the launcher but never executes it; requires the exact two-line WinGet script targeting the fixed Claude package executable; and returns that package path only when the injected/default file check confirms it exists. Unreadable/mismatched/missing paths retain the existing fallback. The existing npm shim path remains ahead of this additional WinGet branch. I found no demonstrated P1/P2 in the two-file delta.
Regression coverage inspected: positive cases include CRLF/LF, case-insensitive environment-key spelling, literal $&/%name% in LOCALAPPDATA, 8.3/junction aliases, and existing npm resolution. Negative cases include a different package, wrong environment variable, traversal, extra args/commands, absent/relative LOCALAPPDATA, missing executable, unreadable launcher/path, and unrelated shim paths. The selected normal CI log for ClaudeExecutable.test.ts reports 7/7 passed.
Exact-head verification read: normal PR workflow #42283721963 completed SUCCESS. All eight Test Server shards, Lint, Build and Typecheck, Test, and aggregate Check succeeded. Test Web, Release Smoke, Rust, Mobile Native Static Analysis, Web Preview, Mobile EAS Preview, and relay preview were skipped; those are not passes. The author reports a Windows x64 end-to-end capability probe against a real WinGet layout and native Claude executable, with no prompt/model request; I did not independently reproduce that host run.
Target qualification limitation: current main is 26 commits ahead of the PR's base and the candidate is 2 commits ahead / 26 behind. The intervening main comparison shows no changes to either PR path, ClaudeProvider.ts, or shared shell resolution, but this is not a current-main-composed candidate or CI run. Rebase/target composition and normal exact-new-head checks remain with the author/landing steward. No merge approval is implied.
Disposition: no new scoped P1/P2; source-level review complete at the exact candidate head; COMMENTED, not APPROVED. No provider sign-in/turn, credentials, deployment, or live service/session operation was performed by this reviewer.
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size:M30-99 changed lines (additions + deletions).vouch:unvouchedPR author is not yet trusted in the VOUCHED list.
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Problem
Addresses the WinGet case reported in #24293: #24293 (comment).
On Windows, a
claude.cmdin%LOCALAPPDATA%\Microsoft\WinGet\Linksforwards to the native Claude executable in WinGet's package directory. The resolver only checks npm package entries beside the launcher, then handsclaudeback to the SDK. Provider capability initialization fails even though the native executable is installed and runnable.Change
Recognize the reported two-line WinGet launcher at its known location and return the existing Claude package executable. Read
LOCALAPPDATAfrom the supplied environment case-insensitively and keep its value literal. When launcher path spellings differ, compare their canonical paths so 8.3 names and directory junctions reach the same supported launcher. Unsupported commands, other package targets, unreadable launchers, and missing executables retain the existing fallback. Launcher contents are never executed.Scope and approval
This qualifies as a small, focused fix for an obvious bug in the existing Windows Claude launcher resolver. It changes server-side executable discovery used by capability probes and the Claude adapter, including when clients connect remotely to a Windows environment. It adds no setting, client UI, or provider behavior outside this launcher case.
#24533 covers pnpm's different launcher format; this change addresses the documented WinGet case only and does not close the broader issue.
Verification
Environment: Windows x64, Node 26.12.1, locked Effect 4.1.2 and Claude Agent SDK 0.3.316, real Claude Code 2.1.319.
6577c6b6185167c0e502fa01f9e8e8f2dee6ff25, with the regression added first: fromapps/server,vp test run src/provider/Drivers/ClaudeExecutable.test.ts -t "follows the WinGet launcher" --maxWorkers 1failed: expected the package executable, receivedclaude.apps/server,vp test run src/provider/Drivers/ClaudeExecutable.test.ts src/provider/ClaudeCapabilitiesProbe.test.ts src/provider/AgentContextBudget.test.ts --maxWorkers 1passed, 12 tests across three files. This includes both check:changed-selected test files and additional capability-probe coverage. The existing cases cover canonical paths, 8.3 names, junction aliases, distinct and unreadable paths, CRLF/LF, case-insensitive environment keys, literal$&/%name%, unsupported launcher forms, missing targets, and npm resolution.vp fmt --check apps/server/src/provider/Drivers/ClaudeExecutable.ts apps/server/src/provider/Drivers/ClaudeExecutable.test.tsandvp lintwith the same two paths passed.vp run --cache --parallel --concurrency-limit 1 --filter @t3tools/evals --filter @t3tools/scripts --filter t3 typecheck.vp run --filter ./apps/server generate --checkpassed.vp run knip:check:filesandvp run knip:check:exportspassed.vp run check:changed --concurrency 1was attempted but could not reach its check stages: on this Windows checkout, its ignored-inputgit ls-filesscan follows nested pnpm workspace junctions and emits repeatedFilename too longwarnings (covered separately by #32023). The stalled scan was stopped after preserving its output. The individual commands above cover every check selected for these two changed files; the wrapper itself did not pass and its cache was not written.The root Vitest launcher also tries to initialize an unrelated browser project on port 62126, inside this machine's Windows-excluded range 62059–62158 (
EACCES, covered separately by #24007). Server tests ran through their owningapps/serverconfiguration with the same selected files. No repository configuration or check was weakened to bypass these local tooling problems.For end-to-end verification, created a fresh temporary Windows directory with the exact reported
Links\claude.cmdand package layout, hard-linked the real installed Claude executable into it, and supplied an isolatedPath, mixed-caseLocalAppData, emptyCLAUDE_CONFIG_DIR, and isolated home. Called the productionprobeClaudeCapabilities(settings, environment, fixtureDirectory, false)withbinaryPath: "claude"andNodeServices.layer. This runs the real resolver, SDK, native child process, and initialization IPC. The probe's never-yielding prompt sends no model request; no live T3 state or Claude credentials were used.The review follow-up also reproduced the alias-path defect against
47cc26e: the extended existing regression returnedclaudeinstead of the package executable, and the real SDK capability probe failed with a junction on PATH. After the fix, both a real Windows junction and an actual 8.3 PATH initialized successfully (44 commands, five models each). Those runs used the same isolated native Claude/SDK workflow with no prompt or credentials. All selected individual checks were rerun for the follow-up.The runtime check reproduces the WinGet layout with the installed native executable; it does not perform a new WinGet installation or a paid agent turn. No visual surface changed.
Implemented with OpenAI GPT-6 via the Codex harness.