tools.md 3.2 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.
Session Subtask
Run a focused child worker session for a bounded task and return its summary to the caller.
| Command / Tool | Description |
|---|---|
/subtask <goal> |
Ask the current agent to prepare and start a bounded worker for the requested task |
subtask |
Creates a child orchestrator session and returns its structured summary |
read_session |
Lets a subtask worker inspect the source session when needed context is missing |
Slim creates a real child session with the current session as parentID, injects
relevant file context, and asks the worker to complete only the requested task.
The worker returns a <subtask_summary> with status, changes, files touched,
validation, and follow-up notes. In tmux/zellij this appears like other child
agent work: a pane can open for the worker and close after cleanup.
See Subtask for the full workflow.
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.
Todo Continuation
Auto-continue has its own guide now:
- Todo Continuation — controls, safety gates, behavior, and config