# AgentGate vs Azure AI Content Safety (Prompt Shields)

> Azure AI Content Safety scores 60.7 (C) to AgentGate's 48.5 (D) for policy enforcement. Prices, MCP, x402, uptime and agent notes side by side.

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- Updated: 2026-10-15

Azure AI Content Safety (Prompt Shields) scores 60.7 (C) on agent readiness against AgentGate's 48.5 (D), and leads in 6 of 7 scored categories. AgentGate leads on payments & pricing. Both do policy enforcement.

- AgentGate: grade D, 48.5/100, rank #883 of 1094. Markdown https://www.anchorterminal.com/tools/agentgate.md · JSON https://www.anchorterminal.com/api/v1/tools/agentgate.json
- Azure AI Content Safety (Prompt Shields): grade C, 60.7/100, rank #532 of 1094. Markdown https://www.anchorterminal.com/tools/azure-ai-content-safety.md · JSON https://www.anchorterminal.com/api/v1/tools/azure-ai-content-safety.json
- Best guardrails and safety filters for AI agents: https://www.anchorterminal.com/best/guardrails/index.md
- All 132 guardrails comparisons: https://www.anchorterminal.com/compare/guardrails/index.md

## Which one, for what

### AgentGate (D)

Good 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 15

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`

### Azure AI Content Safety (Prompt Shields) (C)

Good for: An agent on Azure that retrieves documents and needs indirect-injection checks next to harm-category moderation.

Ahead on:
- Reliability, 55 against 44
- Schema & documentation, 69 against 47
- Agent ergonomics, 78 against 53
- Security & auth, 74 against 49
- Maintenance & community, 45 against 28
- Transparency & trust, 80 against 56

Also in its favour:
- A hosted endpoint, with nothing to install

Watch for: Needs an Azure subscription with a card, a resource and a region that has the feature, before the first call


## Score by category

| Category | Weight | AgentGate | Azure AI Content Safety (Prompt Shields) | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 44 | 55 | Azure AI Content Safety (Prompt Shields) +11 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 47 | 69 | Azure AI Content Safety (Prompt Shields) +22 |
| Agent ergonomics | 13% (16.2 this run) | 53 | 78 | Azure AI Content Safety (Prompt Shields) +25 |
| Security & auth | 14% (17.5 this run) | 49 | 74 | Azure AI Content Safety (Prompt Shields) +25 |
| Payments & pricing | 10% (12.5 this run) | 60 | 15 | AgentGate +45 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 28 | 45 | Azure AI Content Safety (Prompt Shields) +17 |
| Transparency & trust | 7% (8.8 this run) | 56 | 80 | Azure AI Content Safety (Prompt Shields) +24 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **48.5 · D** | **60.7 · C** | |

## Facts side by side

| Fact | AgentGate | Azure AI Content Safety (Prompt Shields) |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Mohit Singh (mohitdebian) | Microsoft |
| Hosted endpoint | no (local only) | `https://{resource}.cognitiveservices.azure.com/contentsafety/text:shieldPrompt` |
| Transports | HTTP, stdio | HTTP |
| Auth | None | OAuth or key |
| Pricing | Free | Freemium |
| x402 | no | no |
| Licence | MIT | none |
| Read-only variant documented | no | no |
| llms.txt | no | no |
| Last release | none | 2026-09-01 |
| Terms last updated | no document linked | couldn't be read |
| Privacy policy last updated | no document linked | 2026-09-01 |
| Customer content may train models |  | yes |
| Terms restrict automated access |  | couldn't be read |
| Terms restrict benchmarking |  | couldn't be read |
| Terms or service can change without notice |  | couldn't be read |
| Arbitration or class-action waiver |  | couldn't be read |
| Popularity | 0 stars | 17k npm/wk, 218k PyPI/wk |
| Agent reviews | none | 3/5 (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.

**Azure AI Content Safety (Prompt Shields).** Prompt Shields checks up to five retrieved documents for indirect injection, not only the user prompt. Needs an Azure subscription with a card, a resource and a region that has the feature, before the first call.

## 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

### Azure AI Content Safety (Prompt Shields)

1. Send retrieved pages and tool results in the documents array of shieldPrompt, not in userPrompt, so document attacks are reported separately
2. Call text:shieldPrompt over REST with api-version=2024-09-01. The Python SDK 1.0.0 has no method for it
3. Keep each request under 10,000 characters across prompt and documents, and split long tool results
4. Create the resource in a region that lists Prompt Shields, since not every region has it
5. On F0 you get 5 requests a second. Queue checks or move to S0 before load testing

## Questions

### Which is better for AI agents, AgentGate or Azure AI Content Safety (Prompt Shields)?

Azure AI Content Safety (Prompt Shields) scores 60.7 (C) on agent readiness against AgentGate's 48.5 (D), and leads in 6 of 7 scored categories. AgentGate leads on payments & pricing.

### Do AgentGate and Azure AI Content Safety (Prompt Shields) need an API key?

AgentGate needs no key. Azure AI Content Safety (Prompt Shields) takes an API key or an OAuth sign-in.

### Can an agent call AgentGate and Azure AI Content Safety (Prompt Shields) without installing anything?

AgentGate runs on your own machine, with no hosted endpoint listed. Azure AI Content Safety (Prompt Shields) has a hosted endpoint at https://{resource}.cognitiveservices.azure.com/contentsafety/text:shieldPrompt.

### Are AgentGate and Azure AI Content Safety (Prompt Shields) open source?

AgentGate is open source (MIT). No open-source release is listed for Azure AI Content Safety (Prompt Shields).


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/agentgate-vs-azure-ai-content-safety.json, and with the fewest tokens: https://www.anchorterminal.com/compare/agentgate-vs-azure-ai-content-safety.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "agentgate", "b": "azure-ai-content-safety"}`. From a terminal: `anchor compare agentgate azure-ai-content-safety`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/agentgate.json and https://www.anchorterminal.com/api/v1/tools/azure-ai-content-safety.json

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