Schema | mcp-witness

mcp-witness

Describes the environment variables required to run the server.

Name	Required	Description
`MCP_WITNESS_DB`	No	Path to the SQLite database file. Default: ~/.mcp-witness/witness.db
`MCP_WITNESS_PG_URL`	No	PostgreSQL connection URL (required if backend is postgresql).
`MCP_WITNESS_BACKEND`	No	Database backend: 'sqlite' or 'postgresql'. Default: sqlite
`MCP_WITNESS_HMAC_KEY`	No	32-byte hex key for HMAC protection.
`MCP_WITNESS_LOG_FORMAT`	No	Log format. Set to 'json' for structured logging.
`MCP_WITNESS_AUTO_ANCHOR`	No	Enable automatic external anchoring after each checkpoint. Default: false
`MCP_WITNESS_SIGNING_KEY`	No	32-byte hex seed for Ed25519 signing key. Required for non-repudiation by default.
`MCP_WITNESS_WEBHOOK_URL`	No	URL to POST webhook alerts on chain integrity failure.
`MCP_WITNESS_ENCRYPTION_KEY`	No	32-byte hex key for AES-256-GCM field-level encryption at rest.
`MCP_WITNESS_CHECKPOINT_INTERVAL`	No	Number of records between Merkle checkpoints. Default: 1000
`MCP_WITNESS_REQUIRE_PERSISTENT_KEY`	No	Set to 'false' to allow ephemeral signing keys. Default: true
`MCP_WITNESS_ALLOW_INTERNAL_WEBHOOKS`	No	Set to 'true' to allow webhooks to internal addresses. Default: false
`MCP_WITNESS_FAIL_ON_STARTUP_VERIFICATION_FAILURE`	No	Set to 'false' to skip startup chain verification. Default: true

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