diff --git a/docs/tools/lsp.md b/docs/tools/lsp.md
index ca4be1f86..f86f9e058 100644
--- a/docs/tools/lsp.md
+++ b/docs/tools/lsp.md
@@ -31,7 +31,7 @@
 | `query` | string | No | Workspace symbol query, code-action selector/filter, or LSP method name for `action=request`. |
 | `new_name` | string | No | Required for `rename` and `rename_file`. |
 | `apply` | boolean | No | For `rename`/`rename_file`, apply unless explicitly `false`. For `code_actions`, list unless explicitly `true`. |
-| `timeout` | number | No | Seconds, clamped by `clampTimeout("lsp", ...)` to `5..60`, default `20`. |
+| `timeout` | number | No | Seconds, clamped by `clampTimeout("lsp", ...)` to `5..300`, default `20`. |
 | `payload` | string | No | JSON string for `action=request`; overrides auto-built params. |
 
 ## Outputs
@@ -268,7 +268,7 @@ Same as `definition`, but sends `textDocument/implementation` and reports `imple
   - Background message readers persist for each live client until process exit/shutdown.
 
 ## Limits & Caps
-- Tool timeout clamp: default `20`, min `5`, max `60` seconds — `TOOL_TIMEOUTS.lsp` in `packages/coding-agent/src/tools/tool-timeouts.ts`.
+- Tool timeout clamp: default `20`, min `5`, max `300` seconds — `TOOL_TIMEOUTS.lsp` in `packages/coding-agent/src/tools/tool-timeouts.ts`.
 - LSP request default timeout inside `sendRequest()`: `30_000ms` — `DEFAULT_REQUEST_TIMEOUT_MS` in `packages/coding-agent/src/lsp/client.ts`.
 - Warmup initialize timeout default: `5_000ms` — `WARMUP_TIMEOUT_MS` in `packages/coding-agent/src/lsp/client.ts`.
 - Project-load wait fallback: `15_000ms` — `PROJECT_LOAD_TIMEOUT_MS` in `packages/coding-agent/src/lsp/client.ts`.
diff --git a/packages/coding-agent/CHANGELOG.md b/packages/coding-agent/CHANGELOG.md
index af229b38a..502248e34 100644
--- a/packages/coding-agent/CHANGELOG.md
+++ b/packages/coding-agent/CHANGELOG.md
@@ -99,6 +99,9 @@
 ### Fixed
 
 - Fixed non-raw `read` line selectors returning context outside the requested inclusive range ([#5802](https://github.com/can1357/oh-my-pi/issues/5802)).
+### Fixed
+
+- Fixed LSP requests silently clamping explicit timeouts above 60 seconds by supporting documented budgets up to 300 seconds ([#5804](https://github.com/can1357/oh-my-pi/issues/5804)).
 
 ## [17.0.2] - 2026-07-17
 
diff --git a/packages/coding-agent/src/lsp/types.ts b/packages/coding-agent/src/lsp/types.ts
index fc262ee8a..db3f9d720 100644
--- a/packages/coding-agent/src/lsp/types.ts
+++ b/packages/coding-agent/src/lsp/types.ts
@@ -1,5 +1,6 @@
 import type { ptree } from "@oh-my-pi/pi-utils";
 import { type } from "arktype";
+import { TOOL_TIMEOUTS } from "../tools/tool-timeouts";
 
 // =============================================================================
 // Tool Schema
@@ -14,7 +15,10 @@ export const lspSchema = type({
 	query: "string?",
 	new_name: "string?",
 	apply: "boolean?",
-	timeout: "number?",
+	"timeout?": type.number
+		.atLeast(TOOL_TIMEOUTS.lsp.min)
+		.atMost(TOOL_TIMEOUTS.lsp.max)
+		.describe("Timeout in seconds (default 20; range 5–300)."),
 	payload: "string?",
 });
 
diff --git a/packages/coding-agent/src/tools/tool-timeouts.ts b/packages/coding-agent/src/tools/tool-timeouts.ts
index 8d5342b93..102c640ec 100644
--- a/packages/coding-agent/src/tools/tool-timeouts.ts
+++ b/packages/coding-agent/src/tools/tool-timeouts.ts
@@ -13,7 +13,7 @@ export const TOOL_TIMEOUTS = {
 	browser: { default: 30, min: 1, max: 300 },
 	ssh: { default: 60, min: 1, max: 3600 },
 	fetch: { default: 20, min: 1, max: 45 },
-	lsp: { default: 20, min: 5, max: 60 },
+	lsp: { default: 20, min: 5, max: 300 },
 	debug: { default: 30, min: 5, max: 300 },
 } as const satisfies Record<string, ToolTimeoutConfig>;
 
diff --git a/packages/coding-agent/test/tools/lsp-regressions.test.ts b/packages/coding-agent/test/tools/lsp-regressions.test.ts
index 0b64202ac..8a215fcc0 100644
--- a/packages/coding-agent/test/tools/lsp-regressions.test.ts
+++ b/packages/coding-agent/test/tools/lsp-regressions.test.ts
@@ -3,6 +3,7 @@ import * as fs from "node:fs";
 import * as os from "node:os";
 import * as path from "node:path";
 import type { AgentToolResult, RenderResultOptions } from "@oh-my-pi/pi-agent-core";
+import { arkToWireSchema } from "@oh-my-pi/pi-ai/utils/schema";
 import { preloadPluginRoots } from "@oh-my-pi/pi-coding-agent/discovery/helpers";
 import { LspTool } from "@oh-my-pi/pi-coding-agent/lsp";
 import * as lspClient from "@oh-my-pi/pi-coding-agent/lsp/client";
@@ -14,18 +15,19 @@ import {
 	sortAndValidateTextEdits,
 } from "@oh-my-pi/pi-coding-agent/lsp/edits";
 import { renderCall, renderResult } from "@oh-my-pi/pi-coding-agent/lsp/render";
-import type {
-	CodeAction,
-	CreateFile,
-	DeleteFile,
-	Diagnostic,
-	LspClient,
-	LspToolDetails,
-	RenameFile,
-	ServerConfig,
-	SymbolInformation,
-	TextDocumentEdit,
-	WorkspaceEdit,
+import {
+	type CodeAction,
+	type CreateFile,
+	type DeleteFile,
+	type Diagnostic,
+	type LspClient,
+	type LspToolDetails,
+	lspSchema,
+	type RenameFile,
+	type ServerConfig,
+	type SymbolInformation,
+	type TextDocumentEdit,
+	type WorkspaceEdit,
 } from "@oh-my-pi/pi-coding-agent/lsp/types";
 import {
 	applyCodeAction,
@@ -253,10 +255,20 @@ describe("lsp regressions", () => {
 		expect(hasGlobPattern("src/main.ts")).toBe(false);
 	});
 
-	it("clamps LSP timeout to configured bounds", () => {
+	it("supports long LSP timeouts up to the advertised ceiling", () => {
 		expect(clampTimeout("lsp")).toBe(20);
 		expect(clampTimeout("lsp", 1)).toBe(5);
-		expect(clampTimeout("lsp", 1000)).toBe(60);
+		expect(clampTimeout("lsp", 120)).toBe(120);
+		expect(clampTimeout("lsp", 1000)).toBe(300);
+		expect(arkToWireSchema(lspSchema)).toMatchObject({
+			properties: {
+				timeout: {
+					description: "Timeout in seconds (default 20; range 5–300).",
+					maximum: 300,
+					minimum: 5,
+				},
+			},
+		});
 	});
 
 	it("sends the LSP exit notification after shutdown completes", async () => {