docs: experimental LSP tool (#5943)

Co-authored-by: opencode-agent[bot] <opencode-agent[bot]@users.noreply.github.com>
Co-authored-by: Aiden Cline <[email protected]>
Co-authored-by: Aiden Cline <[email protected]>

packages/web/src/content/docs/cli.mdx

@@ -329,3 +329,4 @@ These environment variables enable experimental features that may change or be r
 | `OPENCODE_EXPERIMENTAL_OUTPUT_TOKEN_MAX`        | number  | Max output tokens for LLM responses     |
 | `OPENCODE_EXPERIMENTAL_FILEWATCHER`             | boolean | Enable file watcher for entire dir      |
 | `OPENCODE_EXPERIMENTAL_OXFMT`                   | boolean | Enable oxfmt formatter                  |
+| `OPENCODE_EXPERIMENTAL_LSP_TOOL`                | boolean | Enable experimental LSP tool            |

packages/web/src/content/docs/lsp.mdx

@@ -51,6 +51,34 @@ You can disable automatic LSP server downloads by setting the `OPENCODE_DISABLE_
 
 ---
 
+## LLM Tool (Experimental)
+
+OpenCode includes an experimental built-in tool named `lsp` that lets the LLM query your LSP servers for code navigation and symbol information.
+
+To enable it, set `OPENCODE_EXPERIMENTAL_LSP_TOOL=true` (or `OPENCODE_EXPERIMENTAL=true` to enable all experimental features).
+
+Once enabled, you can still disable it via your `tools` config:
+
+```json title="opencode.json"
+{
+  "$schema": "https://opencode.ai/config.json",
+  "tools": {
+    "lsp": false
+  }
+}
+```
+
+Example prompts:
+
+- "Use the lsp tool to go to definition of `createServer` in `src/server.ts` at line 12, character 5."
+- "Use lsp hover on `User` in `src/models/user.ts` at line 20, character 10."
+
+:::note
+The `lsp` tool only works when an LSP server is available for the file type.
+:::
+
+---
+
 ## How It Works
 
 When opencode opens a file, it:

packages/web/src/content/docs/tools.mdx

@@ -213,6 +213,29 @@ This tool lists directory contents. It accepts glob patterns to filter results.
 
 ---
 
+### lsp (experimental)
+
+Interact with your configured LSP servers to get code intelligence features like definitions, references, hover info, and call hierarchy.
+
+:::note
+This tool is only available when `OPENCODE_EXPERIMENTAL_LSP_TOOL=true` (or `OPENCODE_EXPERIMENTAL=true`).
+:::
+
+```json title="opencode.json" {4}
+{
+  "$schema": "https://opencode.ai/config.json",
+  "tools": {
+    "lsp": true
+  }
+}
+```
+
+Supported operations include `goToDefinition`, `findReferences`, `hover`, `documentSymbol`, `workspaceSymbol`, `goToImplementation`, `prepareCallHierarchy`, `incomingCalls`, and `outgoingCalls`.
+
+To configure which LSP servers are available for your project, see [LSP Servers](/docs/lsp).
+
+---
+
 ### patch
 
 Apply patches to files.