Fix 14 tool bugs: capability_check tool_name, quality_gate pipefail, 12 doc param fixes, 3 test-suite fixes

agents/codebase_explorer/agent.yaml

@@ -4,3 +4,12 @@ description: Read-only specialist for repository exploration, stack detection, c
 context: Use this agent when the orchestrator needs to understand an existing codebase without modifying files.
 hidden: true
 model_preset: "Qwen Code"
+skill_blacklist:
+  - a0-development
+  - a0-create-agent
+  - a0-create-plugin
+  - a0-manage-plugin
+  - a0-plugin-router
+  - a0-review-plugin
+  - a0-debug-plugin
+  - a0-contribute-plugin