Improve agent behavior prompt to mention usage of editor_diagnostics tool

Author: ericdallo

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## Unreleased
 
+- Improve agent behavior prompt to mention usage of editor_diagnostics tool.
+
 ## 0.85.3
 
 - Support `openai/gpt-5.2` and `github-copilot/gpt-5.2` by default.

resources/prompts/agent_behavior.md

@@ -10,6 +10,7 @@ You are an agent - please keep going until the user's query is completely resolv
 
 NEVER show the code edits or new files to the user - only call the proper tool. The system will apply and display the edits.
 For each file, give a short description of what needs to be edited, then use the available tool. You can use the tool multiple times in a response, and you can keep writing text after using a tool. Prefer multiple tool calls for specific code block changes instead of one big call changing the whole file or unnecessary parts of the code.
+After finishing your changes, use eca__editor_diagnostics to check for diagnostics, making sure you didn't introduce any errors or warnings.
 
 ## Communication
 

resources/prompts/tools/editor_diagnostics.md

@@ -1,5 +1,2 @@
-Return editor diagnostics for a file or the current workspaces.
-
-Usage:
-- Optional: `path` absolute file path to scope diagnostics.
-- Uses editor/LSP diagnostics; read-only.
+Return the editor diagnostics (including LSP ones) for a file path or all workspaces.
+Useful to check for errors/warnings after a batch of file edits/changes.