Sign data or a file using a GPG/PGP private key stored in Pincer
AI agents invoke gpg_sign_data to trigger actions in Pincer. 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.
This tool performs a cryptographic signing operation using a stored private key, which is an external operation with significant implications. Signing data can authenticate messages, files, or code, and misuse could lead to forged attestations or unauthorized signatures under a user's identity. It triggers an operation (GPG signing) rather than simply reading or writing data, placing it in the Execute category.
From the tool's definition Sign data or a file using a GPG/PGP private key stored in Pincer
Documented attack patterns abuse exactly the kind of access gpg_sign_data gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Pincer, and nothing reaches the server without passing your rules. This is the rule we recommend for gpg_sign_data:
{
"version": "1",
"default": "deny",
"tools": {
"gpg_sign_data": {
"limits": [
{
"counter": "gpg_sign_data_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}gpg_sign_data 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.
Free to start. No card required.
Sign data or a file using a GPG/PGP private key stored in Pincer. It is categorised as a Execute tool in the Pincer MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Pincer MCP server in PolicyLayer and add a rule for gpg_sign_data: 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 Pincer. Nothing to install.
gpg_sign_data is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the gpg_sign_data 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.
Set action: deny in the PolicyLayer policy for gpg_sign_data. 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.
gpg_sign_data is provided by the Pincer MCP server (VouchlyAI/Pincer-MCP). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Pincer, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
12 Pincer tools catalogued and risk-classified — across an index of 43,000+ MCP servers.