chore(vendor): import pi 0.85.1

Imported as a linear vendor commit so forge rebases do not replay the upstream root tree.

git-subtree-dir: third_party/pi

git-subtree-split: d981de1229ef899957bbe968bc8dcda02a21f477

third_party/pi/packages/agent/src/harness/tools/write.ts

@@ -0,0 +1,44 @@
+import { type Static, Type } from "typebox";
+import type { AgentHarnessTool } from "../types.ts";
+import { getOrThrow } from "../types.ts";
+import { withFileMutationQueue } from "./file-mutation-queue.ts";
+import { resolveToolPath } from "./path-utils.ts";
+import type { ExecutionToolContext } from "./tool-context.ts";
+
+const writeSchema = Type.Object({
+	path: Type.String({ description: "Path to the file to write (relative or absolute)" }),
+	content: Type.String({ description: "Content to write to the file" }),
+});
+
+export type WriteToolInput = Static<typeof writeSchema>;
+
+export function createWriteTool<TContext extends ExecutionToolContext = ExecutionToolContext>(): AgentHarnessTool<
+	TContext,
+	typeof writeSchema,
+	undefined
+> {
+	return {
+		name: "write",
+		label: "write",
+		description:
+			"Write content to a file. Creates the file if it doesn't exist, overwrites if it does. Automatically creates parent directories.",
+		parameters: writeSchema,
+		async execute(_toolCallId, { path, content }, _onUpdate, { env }, _invocation, context) {
+			const absolutePath = await resolveToolPath(env, path, context);
+			return withFileMutationQueue(
+				env,
+				absolutePath,
+				async () => {
+					if (context.abortSignal?.aborted) throw new Error("Operation aborted");
+					getOrThrow(await env.writeFile(absolutePath, content, context));
+					if (context.abortSignal?.aborted) throw new Error("Operation aborted");
+					return {
+						content: [{ type: "text", text: `Successfully wrote to ${path}` }],
+						details: undefined,
+					};
+				},
+				context,
+			);
+		},
+	};
+}