What is smalltalk-validator?

A local MCP server called smalltalk-validator, installed from a GitHub package. MCP is a standard way for an AI agent to connect to external tools or data sources.

Starting the configured smalltalk-validator server locally through `uvx` when its specific tools are defined elsewhere.

The description gives its installation and launch details but does not say what it validates or which operations it supports.

smalltalk-validator — MCP server by mumez

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods

npx agentmods add mcp/mumez/smalltalk-dev-plugin/smalltalk-validator

Clone the repo

git clone --depth 1 https://github.com/mumez/smalltalk-dev-plugin

Made for: Claude Code, Codex, Cursor, Gemini CLI, OpenCode.

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

smalltalk-validator scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.mcp.json · 10 lines

What it actually says

{
  "smalltalk-validator": {
    "command": "uvx",
    "args": [
      "--from",
      "git+https://github.com/mumez/smalltalk-validator-mcp-server.git@main",
      "smalltalk-validator-mcp-server"
    ]
  }
}

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2d ago First seen · 10 lines scan A 7d0f465799aa

Subscribe to this mod's changes

smalltalk-validator is an MCP server published in the GitHub repository mumez/smalltalk-dev-plugin (15 stars, last pushed 5d ago), licensed MIT. Its token cost is not measured: an MCP server costs its tool schemas, not its config file. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Git and workflow Languages claude-code marketplace mcp pharo-smalltalk plugin smalltalk

smalltalk-validator

Getting it into your agent

Grade A, and why

Nothing flagged

What it actually says

What this file has done since we first saw it

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