// MCP TOOL REFERENCE

gemini_chat

Send a prompt to Gemini via gemini-cli. Free tier: 1000 req/day. Uses Google account auth (no API key). Good for code review, architecture questions, analysis. 1M token context window.

ServerClaude Concilium
CategoryExecute

How to control gemini_chat ↓

WHAT IT DOES

What gemini_chat does on Claude Concilium

AI agents invoke gemini_chat to trigger actions in Claude Concilium. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

THE RISK

High Risk

Why gemini_chat needs a policy

This tool executes an external CLI process (gemini-cli) that sends requests to Google's Gemini service using the user's Google account credentials. It triggers external operations via a subprocess, making it Execute category.

From the tool's definition Send a prompt to Gemini via gemini-cli... Uses Google account auth (no API key)

Documented attack patterns abuse exactly the kind of access gemini_chat gives an agent:

POLICY

How to control gemini_chat

PolicyLayer is an MCP gateway — it sits between your AI agents and Claude Concilium, and nothing reaches the server without passing your rules. This is the rule we recommend for gemini_chat:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "gemini_chat": {
      "limits": [
        {
          "counter": "gemini_chat_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

gemini_chat stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register Claude Concilium — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Claude Concilium tools

Execute openai_chat Send a prompt to OpenAI via Codex exec. Non-interactive, fast startup (no MCP servers load Execute gemini_analyze Deep analysis with Gemini — sends a large context (up to 1M tokens). Use for analyzing ent Execute qwen_chat Send a prompt to Qwen via qwen CLI. Prompt sent via stdin (safe for any content). Models: Read openai_review Code review via Codex review (non-interactive). Reviews uncommitted changes or changes aga

All 5 Claude Concilium tools →

Execute tools on other servers

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Go deeper

High-risk tools in Claude Concilium → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about gemini_chat

What does the gemini_chat tool do? +

Send a prompt to Gemini via gemini-cli. Free tier: 1000 req/day. Uses Google account auth (no API key). Good for code review, architecture questions, analysis. 1M token context window. It is categorised as a Execute tool in the Claude Concilium MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on gemini_chat? +

Register the Claude Concilium MCP server in PolicyLayer and add a rule for gemini_chat: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Claude Concilium. Nothing to install.

What risk level is gemini_chat? +

gemini_chat is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit gemini_chat? +

Yes. Add a rate_limit block to the gemini_chat rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block gemini_chat completely? +

Set action: deny in the PolicyLayer policy for gemini_chat. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides gemini_chat? +

gemini_chat is provided by the Claude Concilium MCP server (spyrae/claude-concilium). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Claude Concilium tool call.

Start from Claude Concilium, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →

Free to start. No card required.

5 Claude Concilium tools catalogued and risk-classified — across an index of 43,000+ MCP servers.