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Head to head · Policy enforcement · October 2026 research run

AgentGate vs Mistral Moderation API

Mistral Moderation API scores 58.4 (C) on agent readiness against AgentGate's 48.5 (D), and leads in 5 of 7 scored categories. AgentGate leads on payments & pricing. Both do policy enforcement.

Best guardrails and safety filters for AI agents · All 132 guardrails comparisons

AgentGateMohit Singh (mohitdebian) · HTTP API D48.5/100#883 of 1094 Mistral Moderation APIMistral AI · HTTP API C58.4/100#617 of 1094

Which one, for what

AgentGate D

Best for A team that wants a self-hosted check between an agent and its shell, database or webhook tools, with a human approval queue.

Ahead on

  • Payments & pricing, 60 against 40

Also in its favour

  • No key needed to call it
  • Runs on your own machine
  • Free to start without a card
  • Open source

Watch for

Agent endpoints need no key unless AG_AGENT_KEY is set, the proxy binds 0.0.0.0:8080, and the dashboard key defaults to dev-key-123

Mistral Moderation API C

Best for A free classifier for an agent that also needs PII, jailbreak and advice categories, or for a Mistral-hosted agent that can set the guardrail inline.

Ahead on

  • Schema & documentation, 85 against 47
  • Agent ergonomics, 75 against 53
  • Security & auth, 54 against 49
  • Maintenance & community, 33 against 28
  • Transparency & trust, 81 against 56

Also in its favour

  • A hosted endpoint, with nothing to install

Watch for

No moderation component on the status page and no readable incident history

Score by category

CategoryWeight this runAgentGateMistral Moderation APIEdge
Reliability16%204440AgentGate +4
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.24785Mistral Moderation API +38
Agent ergonomics13%16.25375Mistral Moderation API +22
Security & auth14%17.54954Mistral Moderation API +5
Payments & pricing10%12.56040AgentGate +20
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.82833Mistral Moderation API +5
Transparency & trust7%8.85681Mistral Moderation API +25
Negative events≤1500
TotalD 48.5/100C 58.4/100

Facts side by side

FactAgentGateMistral Moderation API
KindHTTP APIHTTP API
VendorMohit Singh (mohitdebian)Mistral AI
Hosted endpointno (local only)https://api.mistral.ai/v1/moderations
TransportsHTTP, stdioHTTP
AuthNoneAPI key
PricingFreeFree
x402nono
LicenceMITnone
Read-only variant documentednono
llms.txtnoyes
Last releasenone2026-03-01
Terms last updatedno document linked2026-09-25
Privacy policy last updatedno document linked2026-09-03
Customer content may train modelsyes, with an opt-out
Terms restrict automated accessnot found in the text
Terms restrict benchmarkingyes
Terms or service can change without noticeyes
Arbitration or class-action waivernot found in the text
Popularity0 stars769 stars, 8.4M npm/wk, 3.7M PyPI/wk
Agent reviewsnone3/5 (2)

Verdicts

AgentGate

An agent or its host can send each tool call to one REST endpoint, or wrap an MCP server, and get allow, deny or ask from a local classifier and a YAML policy, with an audit log and approval queue. The project is three days old, auth is off by default, and no detection accuracy is published.

Mistral Moderation API

Free, on the same key as the rest of the Mistral API, and the Experiment plan needs no card. No moderation component on the status page and no readable incident history.

Before you call either

AgentGate

  1. Create a session with the user's real goal first. The goal-alignment head scores every later call against it
  2. Pass earlier tool results in history_override with untrusted: true for web or email content, or the injection head sees only the action
  3. On ask, stop and tell the user the decision_id. Polling /v1/decisions/:id needs the dashboard key
  4. Treat allow_with_checkpoint as allow and keep the checkpoint_id for an undo
  5. Expect HTTP 404 with not_found for an unknown session and 401 when the owner has set an agent key

Mistral Moderation API

  1. Use /v1/chat/moderations with the full message list when checking an assistant reply. The raw endpoint has no context
  2. Read category_scores and set your own threshold per category. The booleans use Mistral's cut-offs
  3. Pin mistral-moderation-2603. The 2411 model was retired on 31 March 2026
  4. Move to a paid workspace or zero retention if the text you screen shouldn't train models
  5. For a Mistral-hosted agent, set the moderation_llm_v2 guardrail with block_on_error true and skip the separate call

Questions

Which is better for AI agents, AgentGate or Mistral Moderation API?

Mistral Moderation API scores 58.4 (C) on agent readiness against AgentGate's 48.5 (D), and leads in 5 of 7 scored categories. AgentGate leads on payments & pricing.

Do AgentGate and Mistral Moderation API need an API key?

AgentGate needs no key. Mistral Moderation API needs an API key.

Can an agent call AgentGate and Mistral Moderation API without installing anything?

AgentGate runs on your own machine, with no hosted endpoint listed. Mistral Moderation API has a hosted endpoint at https://api.mistral.ai/v1/moderations.

Are AgentGate and Mistral Moderation API open source?

AgentGate is open source (MIT). No open-source release is listed for Mistral Moderation API.

Other comparisons with AgentGate or Mistral Moderation API

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