Best possible solution:

Land one canonical doctor-boundary fix that downgrades optional doctor completion install failures without changing the explicit completion installer contract.

Do we have a high-confidence way to reproduce the issue?

Yes. The linked issue provides EACCES logs, and current-main source shows doctor --fix can reach doctorShellCompletion, await installCompletion, and let a profile-write exception escape through runShellCompletionHealth; I did not run a live repro in this read-only pass.

Is this the best way to solve the issue?

Yes for the code boundary: doctorShellCompletion is the narrow place to downgrade optional doctor install failures while leaving completion --install fatal for explicit use. Weakening installCompletion itself would be broader than needed, and the update flow already catches optional refresh failures at its caller boundary.

AGENTS.md: found and applied where relevant.

Codex review notes: model internal, reasoning high; reviewed against 414ecd2b9689.

Label justifications:

• P2: The PR targets a deterministic doctor CLI failure in locked-down shell-profile environments with limited runtime blast radius.
• rating: 🧂 unranked krab: Overall readiness is 🧂 unranked krab; proof is 🧂 unranked krab and patch quality is 🐚 platinum hermit.
• status: 📣 needs proof: The PR needs real behavior proof before ClawSweeper can clear the contributor ask. Needs real behavior proof before merge: The PR body lists tests but no after-fix terminal output, logs, screenshot, or linked artifact showing doctor --fix handling an unwritable shell profile; the contributor should add redacted proof and update the PR body to trigger re-review.

PR surface:

Source +37, Tests +52. Total +89 across 2 files.

What I checked:

• Repository policy read: Root AGENTS.md was read fully; its PR review requirements for read-beyond-diff, proof assessment, duplicate checks, and best-fix judgment apply here, and there is no scoped AGENTS.md under src/commands. (AGENTS.md:1, 414ecd2b9689)
• Current main failure path: Current main still awaits installCompletion directly in both doctor-owned shell completion install paths, so profile write failures can escape doctorShellCompletion. (src/commands/doctor-completion.ts:198, 414ecd2b9689)
• Installer error contract: installCompletion writes the resolved profile and wraps write failures as Failed to install completion, matching the linked EACCES failure shape. (src/cli/completion-runtime.ts:303, 414ecd2b9689)
• Doctor caller propagation: runShellCompletionHealth awaits doctorShellCompletion without a local catch, so an installer exception can fail the doctor health flow. (src/flows/doctor-health-contributions.ts:1070, 414ecd2b9689)
• Latest release still unpatched: v2026.6.11 points at e085fa1 and still has the same direct installCompletion calls in doctorShellCompletion. (src/commands/doctor-completion.ts:198, e085fa1a3ffd)
• PR implementation: The PR adds installOptionalShellCompletion, catches install failures, emits a Shell completion note, and returns before success notes when installation fails. (src/commands/doctor-completion.ts:163, 1f1ebf23eb9d)

Likely related people:

• shakkernerd: Commit 3fae903 added the doctor shell-completion module and doctorShellCompletion flow that owns the affected optional install behavior. (role: introduced behavior; confidence: high; commits: 3fae90386328; files: src/commands/doctor-completion.ts)
• vincentkoc: Commit 0e54440 added the current completion-runtime surface and touched the same doctor completion import boundary. (role: adjacent completion contributor; confidence: medium; commits: 0e54440ecc39; files: src/cli/completion-runtime.ts, src/cli/update-cli/update-command.ts, src/commands/doctor-completion.ts)
• steipete: Commit 7d6d642 moved doctor orchestration into flow contributions, including the caller path that currently awaits doctorShellCompletion. (role: doctor flow refactor author; confidence: medium; commits: 7d6d642cb825, 656848dcd7d0; files: src/flows/doctor-health-contributions.ts, src/commands/doctor-completion.ts, src/wizard/setup.completion.ts)

• 🦀 challenger crab: rare, exceptional readiness with strong proof, clean implementation, and convincing validation.
• 🦞 diamond lobster: very strong readiness with only minor maintainer review expected.
• 🐚 platinum hermit: good normal PR, likely mergeable with ordinary maintainer review.
• 🦐 gold shrimp: useful signal, but proof or patch confidence is still limited.
• 🦪 silver shellfish: thin signal; proof, validation, or implementation needs work.
• 🧂 unranked krab: not merge-ready because proof is missing/unusable or there are serious correctness or safety concerns.
• 🌊 off-meta tidepool: rating does not apply to this item.

Shiny media proof means a screenshot, video, or linked artifact directly shows the changed behavior. Runtime, network, CSP, and security claims still need visible diagnostics.

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