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.

LSP Tools

Language Server Protocol integration for code intelligence across 30+ languages. OpenCode ships pre-configured LSP servers for TypeScript, Python, Rust, Go, and more.

Tool	Description
`lsp_goto_definition`	Jump to a symbol's definition
`lsp_find_references`	Find all usages of a symbol across the workspace
`lsp_diagnostics`	Get errors and warnings from the language server
`lsp_rename`	Rename a symbol across all files atomically

See the official OpenCode docs for the full list of built-in LSP servers and their requirements.

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.

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

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