Sentry

Developer · MCP Server

Securing the Sentry MCP server

The Sentry MCP server gives an agent issues, stack traces, and event payloads. That is useful, and it is also a set of real capabilities pointed at a real system. Here is what it exposes, why it is worth governing, and the policy to put in front of it.

What the server hands your agent

Listing and reading error issues, stack traces, breadcrumbs, and captured request payloads.

Why it is worth governing

  • Captured request bodies and local variables in stack frames are the classic place tokens and personal data end up.
  • Error messages often embed user-supplied input verbatim, which makes a stack trace an injection vector.
  • Issue resolution and assignment are team-visible actions.

Tag what the tools actually do

Prismor tags every tool by behavior rather than by name, so rules survive a server adding tools you have never seen. A sensible starting map for Sentry:

Tool patternTagsWhy
mcp__sentry__*issue*untrusted_contenterror text embeds user input
mcp__sentry__*event*private_datasecrets_accessevent payloads capture tokens and PII

Patterns are illustrative globs. Run prismor tags list to see how your installed tools actually resolve.

The policy

Rules read as a sentence: a tag, then or with another tag, and what to do about it. Note the mode - start by watching, not blocking.

settings:
  tool_tags:
    enabled: true
    mode: observe            # switch to enforce once the log looks right
    tags:
      "mcp__sentry__*issue*": [untrusted_content]
      "mcp__sentry__*event*": [private_data, secrets_access]
    rules:
      - "private_data then external_comms -> block"
      - "secrets_access with external_comms -> block"

Putting Sentry behind the gateway

You do not change the Sentry server or how it is configured. Move your existing mcpServers block behind the Prismor gateway and point your agent at Prismor instead:

prismor mcp-gateway install    # moves your .mcp.json servers behind the gateway
prismor mcp-gateway uninstall  # restores the original, backup kept

Your agent sees the same Sentry tools, namespaced as mcp__sentry__<tool>. Every call is evaluated against policy before it is forwarded, and every result is scanned as untrusted content before the model sees it.

Frequently asked questions

Is the Sentry MCP server safe to give an AI agent?

It is as safe as the credential behind it and the policy in front of it. The server itself is not the problem: the risk is that an agent can combine Sentry access with everything else in the session, with no record of what it did. Front it with a gateway that evaluates each call and logs the verdict.

Does Prismor replace the Sentry MCP server?

No. You keep running the same server, unchanged. Prismor aggregates it behind a single connector so your agent sees the same tools, namespaced as mcp__<server>__<tool>, with every call and every result passing through policy first.

Will this block work my team actually needs to do?

Not if you start in observe mode. Every call is recorded with the decision that would have applied, and nothing is blocked. You promote rules to enforce once the log shows the policy matches how your agents really work.

What about tool results, not just tool calls?

Results are scanned as untrusted content before the model sees them. A response carrying injected instructions or poisoned output is withheld and replaced with the reason, which matters most for servers that return text other people wrote.

One gateway for every MCP server

Sentry is one connector. The same policy covers the rest of them, plus the shell commands and file access your agents already have.

Install PrismorHow MCP security works

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Sentry is a trademark of its respective owner. Prismor is not affiliated with or endorsed by it. The Sentry MCP server is third-party software; Prismor governs it the same way it governs any MCP server, without modifying it.