docs(core): minimize patch tool guidance

packages/core/src/tool/patch.txt

@@ -1,33 +1,9 @@
-Use the `patch` tool to edit files. Your patch language is a stripped‑down, file‑oriented diff format designed to be easy to parse and safe to apply. You can think of it as a high‑level envelope:
+Use the `patch` tool to edit files. Provide one patch in this format:
 
 *** Begin Patch
-[ one or more file sections ]
+[one or more file operations]
 *** End Patch
 
-Within that envelope, you get a sequence of file operations.
-You MUST include a header to specify the action you are taking.
-Each operation starts with one of three headers:
+Each operation starts with `*** Add File: <path>`, `*** Delete File: <path>`, or `*** Update File: <path>`. Add file contents use `+` lines; delete operations have no body.
 
-*** Add File: <path> - create a new file. Every following line is a + line (the initial contents).
-*** Delete File: <path> - remove an existing file. Nothing follows.
-*** Update File: <path> - patch an existing file in place (optionally with a rename).
-
-Example patch:
-
-```
-*** Begin Patch
-*** Add File: hello.txt
-+Hello world
-*** Update File: src/app.py
-*** Move to: src/main.py
-@@ def greet():
--print("Hi")
-+print("Hello, world!")
-*** Delete File: obsolete.txt
-*** End Patch
-```
-
-It is important to remember:
-
-- You must include a header with your intended action (Add/Delete/Update)
-- You must prefix new lines with `+` even when creating a new file
+An update may start with `*** Move to: <path>` and contains change lines, optionally separated by `@@` or `@@ <context>` markers. Change lines start with a space for unchanged context, `-` for removed content, or `+` for added content. An optional `*** End of File` marker anchors the final change to the end of the file.

packages/core/src/tool/plugin/patch.ts

@@ -17,7 +17,7 @@ export const name = "patch"
 
 export const Input = Schema.Struct({
   patchText: Schema.String.annotate({
-    description: "The full patch text describing add, update, and delete operations",
+    description: "The complete patch text",
   }),
 })