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Custos

Runtime policy evaluation and tamper-evident audit records for agent tool calls. Python and TypeScript implementations, with MCP integration and a WebMCP adapter.

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Custos / Runtime governanceArchitecture

AI agentTool request

CustosPolicy evaluation

ToolAllowed execution

Signed audit recordSHA-256 chain · Ed25519 signature

Policy decisions at the tool boundary. Evidence for the calls that pass through it.

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Interested in policy evaluation, authorization boundaries or auditability? Start with the repository’s documentation and contribution guide. Concrete failure cases and careful reviews make useful contributions.

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Custos

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worth building.