Signet Eval
Enforce deterministic policies on agent tool calls and govern which MCP servers and actions are allowed before production agents touch real systems.
Overview
signet-eval is a Ship-phase MCP governance layer that applies deterministic policy enforcement and MCP management to AI agent tool calls.
What is this MCP server?
- Deterministic policy enforcement on AI agent tool invocations
- MCP management layer for controlling server and tool exposure
- Designed for eval-style governance of agent actions (signet-eval 3.11.0)
- GitHub-hosted server metadata without extra package boilerplate in manifest
- Fits teams that need repeatable rules instead of prompt-only guardrails
- Registry version 3.11.0 in MCP server schema
- Repository source github.com/jmcentire/signet-eval
Community signal: 2 GitHub stars.
What problem does it solve?
Prompt-only safety fails when agents invoke powerful MCP tools unpredictably and you have no deterministic gate before execution.
Who is it for?
Builders running multi-tool agents in staging or prod who need enforceable rules and MCP inventory control.
Skip if: Hobby prototypes with read-only chat and no MCP tools, or teams unwilling to maintain policy definitions.
What do I get? / Deliverables
After setup, tool calls and MCP usage can be evaluated against fixed policies so disallowed actions never reach downstream systems.
- Policy-evaluated agent tool call path
- Centralized MCP management configuration
- Repeatable security gate for agent automation
Recommended MCP Servers
Journey fit
How it compares
Deterministic agent policy MCP, not a vulnerability scanner skill or a generic logging-only monitor.
Common Questions / FAQ
Who is Signet Eval for?
Solo founders and small teams shipping agent products that connect to MCP tools and need enforceable, repeatable permission rules.
When should I use Signet Eval?
Use it in the ship and security phase when agents can execute real side effects and you want deterministic policy checks before each tool call.
How do I add Signet Eval to my agent?
Follow the GitHub repository setup for Signet Eval, register it as an MCP server in your agent host, and wire your toolchain so tool invocations pass through its policy and MCP management hooks.