Agent-gate adds fail-closed quality gates and hash-chained receipts to AI agent workflows
Agent-gate is an open-source MCP server that enforces a fail-closed checklist and an append-only, sha256 hash-chained receipts ledger before an AI agent can declare its work done.
Score breakdown
Agent-gate addresses the silent failure mode in AI agent systems — where an agent declares success on incorrect or incomplete work — by making the quality gate a structural enforcement rather than a model-level behavior.
- 01Agent-gate is an MCP server that adds a fail-closed quality gate and hash-chained receipt ledger to AI agent workflows.
- 02A check is only satisfied if it is explicitly true — missing proof counts as failure, not a pass.
- 03Every decision is recorded as a (decision, metric, value, verdict) tuple linked in a sha256 hash chain.
Agent-gate is an open-source MCP server authored by jott2121 that addresses what the project describes as the most expensive failures in agent systems: silent ones, where a model update degrades output, a workflow quietly breaks, or an agent declares success while the work is wrong. The project's thesis is that the fix is not a smarter model but a gate the agent cannot talk its way past.
First, a fail-closed checklist (`gate_checklist`) that an agent must satisfy before claiming done — missing proof is treated as failure, not as a pass.
The tool exposes two core mechanisms over MCP. First, a fail-closed checklist (`gate_checklist`) that an agent must satisfy before claiming done — missing proof is treated as failure, not as a pass. Second, a tamper-evident receipts ledger where every decision is stored as a `(decision, metric, value, verdict)` record linked into a sha256 hash chain; calling `verify_chain()` on any altered or deleted receipt returns false. Human approval for irreversible or outward-facing actions is a required check by default. The author describes the overall design as "Fleet Mode," their agent-orchestration doctrine made into a runnable tool.
Key facts
- 01Agent-gate is an MCP server that adds a fail-closed quality gate and hash-chained receipt ledger to AI agent workflows.
- 02A check is only satisfied if it is explicitly true — missing proof counts as failure, not a pass.
- 03Every decision is recorded as a (decision, metric, value, verdict) tuple linked in a sha256 hash chain.
- 04Editing or deleting any past receipt causes verify_chain() to return false.
- 05Human approval for any irreversible or outward-facing action is a required check by default.
- 06The project is described by the author as 'Fleet Mode,' their agent-orchestration doctrine made into a runnable tool.
- 07The repository is public on GitHub under the MIT license with 9 commits at time of publication.
Topics
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