docs: registerTool accepts strict zod object

AGENTS.md

@@ -53,7 +53,10 @@ Applies to every change in this repo, by any agent or human.
 - stdout is the MCP protocol channel — diagnostics go to `console.error` ONLY,
   never `console.log`
 - ESM with NodeNext resolution: relative imports need the `.js` extension
-- MCP SDK v1 (`@modelcontextprotocol/sdk`): `registerTool` takes a ZodRawShape
-  (plain object of zod fields), NOT `z.object()`; subpath imports
-  (`server/mcp.js`, `server/stdio.js`, `client/index.js`, `inMemory.js`, `types.js`)
+- MCP SDK v1 (`@modelcontextprotocol/sdk`): `registerTool` accepts a ZodRawShape
+  (plain object of zod fields) OR a full Zod object (verified on 1.29: AnySchema,
+  `.strict()` honored at runtime). Use a strict `z.object` where unknown-key
+  rejection matters (add_connection); raw shapes are fine elsewhere. Subpath
+  imports (`server/mcp.js`, `server/stdio.js`, `client/index.js`, `inMemory.js`,
+  `types.js`)
 - zod 3 (`import * as z from 'zod'`)