add default TOOLS.md template to workspace

Include a TOOLS.md template with example tool descriptions and usage
guidelines, matching the pattern of existing workspace templates
(SOUL.md, USER.md, IDENTITY.md). Created during onboarding so users
have a starting point for customizing tool behavior.

workspace/TOOLS.md

@@ -0,0 +1,20 @@
+# Tools
+
+Custom tool descriptions and usage guidelines for the AI assistant.
+
+## Examples
+
+- `search_web`: Use for real-time information, news, weather, and current events.
+- `read_file`: Read files from the workspace. Prefer this over shell commands for file content.
+- `write_file`: Create or overwrite files. Use `edit_file` for partial modifications.
+- `shell`: Execute shell commands. Always prefer specific tools over shell when available.
+
+## Guidelines
+
+- Prefer specific tools over generic ones (e.g., use `search_web` instead of `shell` with curl).
+- Always confirm before executing destructive operations (delete, overwrite).
+- Use the `spawn` tool for long-running or independent subtasks.
+
+---
+
+Add your custom tool descriptions below this line: