feat(chat): pick skills anywhere in a message, not only at its start

[demrom]

Change

The / picker opens only when / is the first character of a line, so you can't pick a skill in the middle of a sentence like "run tests then /delegate". Now a / after a space or a newline opens the picker too, and the choice replaces the token at the caret without touching the text around it.

Later in a message the picker lists only skills the agent acts on there:

• Claude Code: its skills. The skills docs say a /name later in a message lets Claude invoke the skill, though it isn't expanded the way a leading one is.
• Codex: its skills, inserted as $name, the syntax Codex uses for a skill inside a prompt.
• pi: nothing. pi expands /skill:name only when the message starts with it.

Builtins such as /clear only work as the whole message, so they still appear only at the start. A / inside a word, as in a/b or a URL, opens nothing.

Away from line starts, / and $ match only the start of a skill name or of a segment after - or :. So /tmp no longer fuzzy-matches template-creator, and Enter sends "look at /tmp" as typed. A path that shares a prefix with a skill name can still open the picker. Fuzzy matching at line starts is unchanged.

Validation

• bun run typecheck passes.
• Parser, composer, skill mention, i18n, conventions and changelog tests: 98 pass, 0 fail. Unit regressions cover /tmp against template-creator, name and segment prefixes, and the fuzzy matching that stays.
• bun scripts/composer-fit-demo-regression.ts passes. New steps check the list for Claude, Codex and pi at 320 and 1280 px, insertion at the caret, $name for Codex, /tmp + Enter sending as typed, prefix matches, line-start fuzzy matching, /clear exclusion, slashes inside words and URLs, IME Enter and @ file mentions.
• bun scripts/settings-pages-demo-regression.ts passes, including the leading / steps.

Screenshots

Claude, 1280 px	Codex, 320 px

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📝 Summary

Summary by CodeRabbit

• New Features
  • Claude Code and Codex skill suggestions are available when you type / or $ after whitespace in a message. Whole-message commands remain available at the start of a message.
• Bug Fixes
  • Inline skill selection now preserves text after the completed command and avoids adding an extra space.
  • Slash suggestions no longer appear for slashes inside words, paths, or URLs.

The composer now recognizes slash triggers after whitespace and offers inline Claude Code and Codex skill suggestions. Inline matching restricts results to name prefixes and selected name segments. Completion preserves trailing message text and avoids duplicate spaces.

Changes: Inline Skill Suggestions

Layer / File(s)	Summary
Trigger detection and completion src/lib/mentions.ts, src/lib/mentions.test.ts	Slash triggers can be detected after whitespace on the current line. Completion preserves the suffix and avoids adding a second space. Tests cover trigger boundaries and completion behavior.
Inline command ranking src/lib/compose.ts, src/lib/compose.test.ts	rankSlashCommands adds an optional prefix-only mode for inline suggestions. Tests cover name-prefix and separator matches, plus excluded fuzzy and description matches.
Composer suggestions and regression coverage src/components/Composer.tsx, scripts/composer-fit-demo-regression.ts, changelog.d/composer-slash-anywhere.md	The composer limits inline suggestions to Claude slash skills and Codex dollar-triggered skills, and inserts each command’s own trigger. Demo regressions cover picker behavior, command completion, and viewport fit. The changelog records the behavior and the start-of-message restrictions.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Feature

Suggested reviewers: devswha

Merge Risk: 🔵 Low · up to 2c6c9

Selecting an inline skill directly before punctuation, such as a comma, can delete that punctuation. This is a small text-editing glitch with no data loss beyond the draft, and it is worth fixing soon.

Pre-merge checks: 5

Passed checks: 5 passed

Check name	Status	Explanation
Title check		The title clearly and concisely describes the main change: skill selection can occur anywhere in a message instead of only at the start.
Description check		The description includes the required Change and Validation sections. It explains the behavior, agent-specific rules, edge cases, test coverage, and regression results. HTTP/WS contract-test coverage …
Docstring Coverage		Docstring coverage is 83.33% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 6 functions across 6 files. (1 skipped: 1 u…
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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Actionable comments posted: 1

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• 🪄 Fix comments: Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @src/lib/mentions.ts:
- Line 40: Update the slash-token end calculation in the mention parser around
`tokenEnd` so punctuation not allowed in skill names is excluded from the token
and remains in the suffix when a skill is selected. Preserve the existing token
boundary behavior for valid skill-name characters.

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📥 Commits

Reviewing files that changed from the base of the PR and between 8b73200 and 2c6c94a.

📒 Files selected for processing: 7

• changelog.d/composer-slash-anywhere.md
• scripts/composer-fit-demo-regression.ts
• src/components/Composer.tsx
• src/lib/compose.test.ts
• src/lib/compose.ts
• src/lib/mentions.test.ts
• src/lib/mentions.ts

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