feat(mcp): restrict grep_app tools to librarian agent only (#395)

* feat(mcp): restrict grep_app tools to librarian agent only

Reduces token usage by disabling grep_app MCP tools globally and enabling them only for the librarian agent, which uses them for GitHub code search during documentation lookups.

Changes:
- Add grep_app_* tool disable globally in config.tools
- Add grep_app_* tool enable for librarian agent
- Remove grep_app references from explore agent prompt (no access)

Closes #394

* chore: changes by sisyphus-dev-ai

---------

Co-authored-by: sisyphus-dev-ai <[email protected]>

Author: sisyphus-dev-ai

assets/oh-my-opencode.schema.json

@@ -64,7 +64,8 @@
           "ralph-loop",
           "preemptive-compaction",
           "compaction-context-injector",
-          "claude-code-hooks"
+          "claude-code-hooks",
+          "auto-slash-command"
         ]
       }
     },

src/agents/explore.ts

@@ -108,18 +108,8 @@ Use the right tool for the job:
 - **Text patterns** (strings, comments, logs): grep
 - **File patterns** (find by name/extension): glob
 - **History/evolution** (when added, who changed): git commands
-- **External examples** (how others implement): grep_app
 
-### grep_app Strategy
-
-grep_app searches millions of public GitHub repos instantly — use it for external patterns and examples.
-
-**Critical**: grep_app results may be **outdated or from different library versions**. Always:
-1. Start with grep_app for broad discovery
-2. Launch multiple grep_app calls with query variations in parallel
-3. **Cross-validate with local tools** (grep, ast_grep_search, LSP) before trusting results
-
-Flood with parallel calls. Trust only cross-validated results.`,
+Flood with parallel calls. Cross-validate findings across multiple tools.`,
   }
 }
 

src/index.ts

@@ -489,6 +489,7 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
 
       config.tools = {
         ...config.tools,
+        "grep_app_*": false, // Disable grep_app tools globally to reduce token usage (only librarian needs them)
       };
 
       if (config.agent.explore) {
@@ -501,6 +502,7 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
         config.agent.librarian.tools = {
           ...config.agent.librarian.tools,
           call_omo_agent: false,
+          "grep_app_*": true,
         };
       }
       if (config.agent["multimodal-looker"]) {