fix(opencode): stop silent session title generation failures

[1837620622]

Issue for this PR

Closes#13710

Type of change

• Bug fix

What does this PR do?

Session auto-naming (ensureTitle) can fail silently, leaving sessions as New session - <timestamp>.

Confirmed root causes on dev:

Layer	Before	After
Model resolution	unguarded getModel Fail → fiber dies	Effect.option + warning log
LLM stream	Effect.orDie → unlogged defect	Effect.catchAll → log + empty text
Fork call site	Effect.ignore swallows everything	Effect.catchCause logs (skips interrupt-only)
small: true	present	kept (preserves smallOptions, avoids #20269 / #20323)

Out of scope: multi-provider fallback, smallOptions gaps, speculative multi-second retry loops.

How did you verify your code works?

• Diff-reviewed against upstream ensureTitle failure chain
• Single-file, ~30 lines, no behavior policy change beyond observability + survival

Author

• @1837620622 (传康Kk)
• 35034498+1837620622@users.noreply.github.com (GitHub-verified)

Checklist

• Linked issue
• Minimal, focused change

[github-actions]

Thanks for your contribution!

This PR doesn't have a linked issue. All PRs must reference an existing issue.

Please:

1. Open an issue describing the bug/feature (if one doesn't exist)
2. Add Fixes #<number> or Closes #<number> to this PR description

See CONTRIBUTING.md for details.

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Based on my search results, I found several related PRs that address session title generation:

Potentially Related PRs

1. PR feat(opencode): allow skipping session title generation via config #33148 - feat(opencode): allow skipping session title generation via config

   • Related to session title generation configuration; may be complementary to error handling improvements

2. PR fix(session): don't let auto-title overwrite a title set mid-turn #32739 - fix(session): don't let auto-title overwrite a title set mid-turn

   • Addresses session title generation logic; related to the same feature area

3. PR fix(provider): respect configured small_model and add opencode handling to smallOptions #31092 - fix(provider): respect configured small_model and add opencode handling to smallOptions

   • Related to model resolution and small model handling, which is part of the error path in this PR's fix

These are related to session title generation and the underlying infrastructure (model resolution, configuration), but none appear to be direct duplicates addressing the same silent error failure issue that PR #35440 targets.

[github-actions]

Thanks for updating your PR! It now meets our contributing guidelines. 👍

[1837620622]

@maintainers This PR addresses the root cause of the intermittent auto-naming failure reported in #13710.

Summary of the approach:

The three bugs form a chain — any of them alone would cause silent failure. The fix addresses all three at their source:

1. Model resolution now uses Effect.option so getSmallModel/getModel errors produce Option.None instead of a fiber-killing defect
2. LLM stream uses Effect.catchAll so transient API errors are logged and produce empty output (which triggers the retry path)
3. Call site uses Effect.catchCause so unexpected defects are logged

The retry path was added as a safety net: if the first attempt produces no title (regardless of the reason), wait 10 seconds for more conversation context, verify the title is still the default, and try again with the full history.

This is more robust than patching individual error causes because it handles:

• Future API changes that introduce new error types
• Provider-specific quirks (e.g., Copilot GPT-4o mini not supporting certain features)
• Transient network/rate-limit failures
• Any other unanticipated failure mode

[1837620622]

Ready for review

This is a minimal, confirmed fix for intermittent silent auto-title failures (#13710).

Why this is safe to merge

• Touches only ensureTitle error handling — no model policy change
• Keeps small: true (avoids reintroducing [BUG] Session title generation fails silently since v1.3.3 — effort parameter leaks into small model call #20269 effort/variant leakage)
• Replaces silent fiber death with structured logs so failures are diagnosable
• ~30 lines, no speculative retry loops

Ask

Could a maintainer review/merge when convenient? Happy to iterate on any nits.

— @1837620622

[1837620622]

Review-ready (optimized)

Slimmed to a minimal, mergeable fix for #13710:

• ✅ Effect.option for model resolution
• ✅ orDie → catchAll on title stream
• ✅ ignore → catchCause at fork (interrupt-only quiet)
• ✅ small: true kept
• ❌ Removed speculative 10s retry path (out of scope)

~30 lines, single file, all checks green. Thanks for review.

[1837620622]

Friendly ping for review when you have a moment 🙏

Minimal fix for intermittent silent auto-title failures (#13710):

• Effect.option for model resolution
• stream orDie → catchAll + log
• fork ignore → catchCause (interrupt-only quiet)
• small: true kept — no model/cost policy change

~30 lines, checks green, ready to merge. Happy to address any nits quickly.

— @1837620622

[github-actions]

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