[tee8z]

Provider launches and adapter version probes could fail when a concurrent fork briefly kept the executable open for writing. Share a bounded retry for ExecutableFileBusy: ten retries at 10 ms intervals. Other launch errors propagate immediately, and version probes include retries within their existing five-second deadline.

Validation: the new regression test reproduced the missing-version result before the fix. After the fix, eight version-probe tests, three provider-launch tests, and 40 repeated writer-conflict cases passed. The full native suite passed 3,453 tests with 19 ignored. Native Clippy, Rust formatting, and the file-size checks passed.

Stack: layer 1 of 24. Base: main. Next: #24. One signed commit per layer. Fresh GitHub CI is running across the stack. No human runtime acceptance is claimed.

Summary by CodeRabbit

• Bug Fixes

  • Improved provider startup and version detection reliability by retrying launches when executables are temporarily busy.
  • Preserved immediate failure reporting for missing providers and persistent launch conflicts.
  • Ensured provider detection respects its full timeout, including process startup time.

• Tests

  • Added coverage for transient and persistent executable conflicts, missing providers, and provider version detection.

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📒 Files selected for processing: 6

• desktop/src-tauri/src/managed_agents/backend.rs
• desktop/src-tauri/src/managed_agents/backend_tests.rs
• desktop/src-tauri/src/managed_agents/discovery.rs
• desktop/src-tauri/src/managed_agents/discovery/tests/codex_version.rs
• desktop/src-tauri/src/managed_agents/mod.rs
• desktop/src-tauri/src/managed_agents/process_spawn.rs

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📝 Walkthrough

Provider launch paths now configure stdio before using a shared spawn helper. The helper retries ExecutableFileBusy errors up to ten times with 10 ms delays. Provider and version-probe tests cover transient recovery, persistent conflicts, and preserved launch errors.

Changes: Provider process launch

Layer / File(s)	Summary
Retry busy provider launches desktop/src-tauri/src/managed_agents/backend.rs, desktop/src-tauri/src/managed_agents/process_spawn.rs, desktop/src-tauri/src/managed_agents/mod.rs, desktop/src-tauri/src/managed_agents/backend_tests.rs	invoke_provider configures stdio before calling the shared spawn helper. The helper retries ExecutableFileBusy errors and performs a final spawn attempt after ten retries. Tests cover transient recovery, persistent conflicts, and preservation of missing-provider NotFound errors.
Retry version-probe launches desktop/src-tauri/src/managed_agents/discovery.rs, desktop/src-tauri/src/managed_agents/discovery/tests/codex_version.rs	The Codex version probe uses the shared spawn helper within its five-second deadline. Tests cover transient executable-busy recovery and persistent writer conflicts.

Priority: ⬆️ High

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

Change: Bug fix · Unblocks: 22 PRs

Suggested reviewers: wpfleger96, tlongwell-block

Merge Risk: ⚪ Minimal · up to 67e4d

This change retries transient executable-busy launch failures for provider launches and version probes, with bounded retries and unchanged handling of other errors. No actionable merge-blocking risk is evident.

Pre-merge checks: 5

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the main change: retrying transient executable conflicts during agent process launches and version probes.
Docstring Coverage		Docstring coverage is 81.82% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 11 functions across 6 files.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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[tee8z]

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Agent review of 88f01fe57837a194ccb17c7e797b80c61426be8c against #27.

Minimalism: 9/10. Elegance: 9/10. Correctness: 9/10. No blocking findings in the current diff. Only executable-busy spawn failures retry, for ten 10-millisecond waits. No provider request is written before successful spawn; protocol negotiation and deployment retain the same staged bytes. Persistent write conflicts and unrelated launch errors still fail.

Validation: the transient-writer regression failed against the original spawn path; all three added cases pass. The integrated desktop native suite passed 3,445 tests. Thirty parallel runs of the 13 provider tests passed (390 executions), including protocol mismatch and staged-source replacement checks. Native Clippy with warnings denied passed. The complete local CI command has not passed in one run; unrelated mobile timeout cases passed in isolation and the terminal unit suite passed in an isolated Linux container with standard tools. Human workflow confirmation remains pending under AGENTS.md.

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@thebrandonlucas please review this PR, layer 1 of 23 in the remote-agent stack. Assigned to @tee8z.

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[tee8z]

CI note: this stack still hits flaky tests in code it does not change. When one of these fails here, the failure is unrelated to this PR, and a re-run usually passes.

• buzz-cli client::retry_policy_tests::exhausted_connect_failures_return_network_retryable: a parallel test can take the freed port and answer with HTTP 405.
• Desktop smoke E2E huddle-transcription.spec.ts and empty-edit-delete.spec.ts: upstream fix test: fix recurring CI flakes in desktop and Postgres lanes block/buzz#8343, backported in fix(ci): stabilize fork publishing and desktop smoke fixtures #24.
• buzz-db cluster-wide replica_fence PostgreSQL tests: fixed in fix(ci): stabilize PostgreSQL concurrency tests #31 for the layers above it.
• buzz-agent steer_rejected_on_run_id_mismatch: fixed in test(agent): wait for both responses in the steer run-id mismatch test #33 for the layers above it.
• buzz-acp adapter-spawn tests that fail with Text file busy (ETXTBSY).

Summary jobs from cancelled runs also stay red until the replacement run finishes. A failure in this PR's own code gets a fix in this PR.

@thebrandonlucas it's fine to approve without CI fully passing.

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