# Agentvet Mcp

> MCP server: validate tool-call args before execution. Wraps @mukundakatta/agentvet.

- **Type:** MCP server
- **Install:** `agentstack add mcp-mukundakatta-agentvet-mcp`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [MukundaKatta](https://agentstack.voostack.com/s/mukundakatta)
- **Installs:** 0
- **Category:** [AI & ML](https://agentstack.voostack.com/c/ai-and-ml)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [MukundaKatta](https://github.com/MukundaKatta)
- **Source:** https://github.com/MukundaKatta/agentvet-mcp
- **Website:** https://doi.org/10.5281/zenodo.20074702

## Install

```sh
agentstack add mcp-mukundakatta-agentvet-mcp
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# agentvet-mcp

**MCP server for [`@mukundakatta/agentvet`](https://www.npmjs.com/package/@mukundakatta/agentvet).** Lets Claude Desktop, Cursor, Cline, Windsurf, Zed, or any other MCP client validate LLM-generated tool-call args before execution and produce LLM-friendly retry messages when something's wrong.

```bash
npx -y @mukundakatta/agentvet-mcp
```

Three tools:

- **`validate_tool_args`** — check args against a small shape spec; returns `{ valid, error?, retry_hint? }` where `retry_hint` is a ready-to-send LLM feedback message.
- **`lint_tool_definition`** — sanity-check a tool definition for common mistakes that hurt LLM tool-use accuracy.
- **`generate_retry_message`** — given a validation error, build the canonical LLM-facing retry message using agentvet's `ToolArgError.toLLMFeedback()` formatting.

## Add to your client

### Claude Desktop

Edit `~/Library/Application Support/Claude/claude_desktop_config.json` (macOS) or `%APPDATA%\Claude\claude_desktop_config.json` (Windows):

```json
{
  "mcpServers": {
    "agentvet": {
      "command": "npx",
      "args": ["-y", "@mukundakatta/agentvet-mcp"]
    }
  }
}
```

Same shape for Cursor (`~/.cursor/mcp.json`), Cline, Windsurf, Zed.

## Tool examples

**`validate_tool_args`:**

```json
{
  "tool_name": "send_email",
  "args": { "to": "a@b.com" },
  "shape": { "to": "string", "subject": "string", "body": "string" }
}
```

Returns:

```json
{
  "valid": false,
  "error": "missing required field: subject",
  "retry_hint": "send_email rejected your args: missing required field: subject. Please call again with the corrected arguments."
}
```

**`lint_tool_definition`:**

```json
{
  "tool": {
    "name": "BadName",
    "inputSchema": { "type": "object", "properties": { "x": { "type": "string" } } }
  }
}
```

Returns warnings about non-snake_case name, missing description, missing field descriptions, and no required fields.

**`generate_retry_message`:**

```json
{
  "tool_name": "send_email",
  "validation_error": "missing required field: subject",
  "attempted_args": { "to": "a@b.com" }
}
```

Returns the canonical retry feedback string the runtime callers see — so you can prepare retry text outside the live agent loop.

## Why a separate MCP server

`@mukundakatta/agentvet` is a zero-dependency JavaScript library. This MCP server makes its validation primitives accessible from any MCP-aware AI assistant. Useful for quickly auditing a registry of tools, or asking the assistant "is this args object valid for my `send_email` tool?" without leaving the chat.

For runtime arg validation in your agent loop, use `@mukundakatta/agentvet` directly inside your Node process (it wraps your tool fn and throws `ToolArgError` synchronously).

## Sibling MCP servers

Part of the agent-stack series:

- [`@mukundakatta/agentfit-mcp`](https://www.npmjs.com/package/@mukundakatta/agentfit-mcp) — *Fit it.*
- [`@mukundakatta/agentguard-mcp`](https://www.npmjs.com/package/@mukundakatta/agentguard-mcp) — *Sandbox it.*
- [`@mukundakatta/agentsnap-mcp`](https://www.npmjs.com/package/@mukundakatta/agentsnap-mcp) — *Test it.*
- [`@mukundakatta/agentvet-mcp`](https://www.npmjs.com/package/@mukundakatta/agentvet-mcp) — *Vet it.* (this)
- [`@mukundakatta/agentcast-mcp`](https://www.npmjs.com/package/@mukundakatta/agentcast-mcp) — *Validate it.*

## License

MIT

## Source & license

This open-source MCP server is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [MukundaKatta](https://github.com/MukundaKatta)
- **Source:** [MukundaKatta/agentvet-mcp](https://github.com/MukundaKatta/agentvet-mcp)
- **License:** MIT
- **Homepage:** https://doi.org/10.5281/zenodo.20074702

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/mcp-mukundakatta-agentvet-mcp
- Seller: https://agentstack.voostack.com/s/mukundakatta
- Browse the marketplace: https://agentstack.voostack.com/browse

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