tools.md 2.7 KB
Tools & Capabilities
Built-in tools available to agents beyond the standard file and shell operations.
apply_patch rescue
Slim only intercepts apply_patch before the native tool runs. It rewrites recoverable stale patches, canonizes safe tolerant matches against the real file when unicode/trim drift is the only mismatch, keeps the authored new_lines bytes intact, preserves the existing file EOL/final-newline state for updates, validates malformed patches strictly before helper execution, uses a conservative bounded LCS fallback, accumulates helper state when the same path appears in multiple Update File hunks, blocks apply_patch before native execution if any patch path falls outside the allowed root/worktree, and fails on ambiguity instead of guessing. It does not rewrite edit or write inputs.
Web Fetch
Fetch remote pages with content extraction tuned for docs/static sites.
| Tool | Description |
|---|---|
webfetch |
Fetch a URL, optionally prefer llms.txt, extract main content from HTML, include metadata, and optionally save binary responses |
webfetch blocks cross-origin redirects unless the requested URL or derived permission patterns explicitly allow them, and it can fall back to the raw fetched content when secondary-model summarization is unavailable.
Code Search Tools
Fast, structural code search and refactoring - more powerful than plain text grep.
| Tool | Description |
|---|---|
grep |
Fast content search using ripgrep |
ast_grep_search |
AST-aware code pattern matching across 25 languages |
ast_grep_replace |
AST-aware code refactoring with dry-run support |
ast_grep understands code structure, so it can find patterns like "all arrow functions that return a JSX element" rather than relying on exact text matching.
Background Task Control
| Tool | Description |
|---|---|
cancel_task |
Cancel a tracked background specialist task by native task ID or Background Job Board alias |
cancel_task is orchestrator-only. It only cancels background tasks tracked for
the current orchestrator session, and it does not roll back partial edits. After
cancelling a write-capable task, inspect and reconcile file changes before
launching replacement work.
See the background orchestration concepts in Background Orchestration for the session lifecycle and cancellation edge cases behind this tool.
Formatters
OpenCode automatically formats files after they are written or edited, using language-specific formatters. No manual step needed.
Includes Prettier, Biome, gofmt, rustfmt, ruff, and 20+ others.
See the official OpenCode docs for the complete list.