feat(cli): /tools lists every tool available in this session

[emal-avala]

Summary

Adds /tools — a slash command that prints every tool currently registered on the active query engine.

Complements:

• /skills — lists the user-authored .md skill surface
• /help — lists slash commands, not tools

Why this exists: users troubleshooting "the agent didn't call the tool I expected" have no way to confirm which tools are actually available — they have to read source or guess from error messages. /tools closes that gap in one shot.

Example

> /tools
31 tool(s) available:
  Agent                  Launch a subagent to handle a complex task autonomously...
  AskUserQuestion        Ask the user a structured question with optional choices...
  Bash                   Run a shell command in the session cwd with optional...
  ...

Output is alphabetized for stable diffing across sessions. Each row is <name> <one-line description>, with descriptions whitespace-collapsed to one line and clipped at 120 chars so rows stay readable in any terminal width.

Implementation

• New pub fn tools(&self) -> &ToolRegistry accessor on QueryEngine so CLI surfaces can introspect the registry without knowing engine internals
• execute_tools helper in commands/mod.rs that sorts + renders
• Two pure helpers (render_tool_summary, clip_summary) kept testable without needing an engine

Test plan

• cargo clippy --workspace --tests --no-deps -- -D warnings — clean
• cargo test -p agent-code --bin agent commands::tests::render_tool_summary — 2/2 pass
• cargo test -p agent-code --bin agent commands::tests::clip_summary — 3/3 pass

5 new tests:

1. render_tool_summary collapses / whitespace to single spaces
2. render_tool_summary pads the name column to 22 chars for alignment
3. clip_summary passes short strings through unchanged
4. clip_summary truncates long strings with a trailing …
5. clip_summary respects char (not byte) boundaries for multi-byte glyphs

[chatgpt-codex-connector]

You have reached your Codex usage limits for code reviews. You can see your limits in the Codex usage dashboard.