# Ck:use MCP

> Utilize MCP server tools with intelligent discovery and execution.

- Skill: `majiayu000/ck-use-mcp` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds add majiayu000/ck-use-mcp`
- Raw SKILL.md: https://api.skillmd.com/api/skills/majiayu000/ck-use-mcp/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Product & Planning
- Author: majiayu000 (https://skillmd.com/u/majiayu000)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/majiayu000/ck-use-mcp

---


# MCP Tool Execution

Execute MCP operations via **Gemini CLI** to preserve context budget.

## Execution Steps

1. **Execute task via Gemini CLI** (using stdin pipe for MCP support):
   ```bash
   # IMPORTANT: Use stdin piping, NOT -p flag (deprecated, skips MCP init)
   # Read model from .claude/.ck.json: gemini.model (default: gemini-3-flash-preview)
   echo "$ARGUMENTS. Return JSON only per GEMINI.md instructions." | gemini -y -m <gemini.model>
   ```

2. **Fallback to mcp-manager subagent** (if Gemini CLI unavailable):
   - Use `mcp-manager` subagent to discover and execute tools
   - If the subagent got issues with the scripts of `ck:mcp-management` skill, use `ck:mcp-builder` skill to fix them
   - **DO NOT** create ANY new scripts
   - The subagent can only use MCP tools if any to achieve this task
   - If the subagent can't find any suitable tools, just report it back to the main agent to move on to the next step

## Important Notes

- **MUST use stdin piping** - the deprecated `-p` flag skips MCP initialization
- Use `-y` flag to auto-approve tool execution
- **GEMINI.md auto-loaded**: Gemini CLI automatically loads `GEMINI.md` from project root, enforcing JSON-only response format
- **Parseable output**: Responses are structured JSON: `{"server":"name","tool":"name","success":true,"result":<data>,"error":null}`

## Anti-Pattern (DO NOT USE)

```bash
# BROKEN - deprecated -p flag skips MCP server connections!
gemini -y -m <gemini.model> -p "..."

# ALSO BROKEN - --model flag with -p
gemini -y -p "..." --model gemini-3-flash-preview
```