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CAPFRAME
← leaderboard/Heroku MCP/tool · get_addon_info
§ toolsandboxHeroku MCP

get_addon_info

on npm:@heroku/mcp-server@1.2.2

Severity

critical0
high0
medium2
low0
info0

2 findings on this tool

  1. mediumunconstrained inputf-r1-get_addon_info

    Tool `get_addon_info` accepts unconstrained string input

    The following string parameter(s) have no `maxLength` constraint: `addon`, `app`. Unbounded strings let an attacker stuff arbitrary payloads through the tool, including indirect-injection content.

    fix: Add a `maxLength` to each string property, or constrain with an `enum` or `pattern`. Most legitimate tool inputs fit under a few hundred bytes.

    OWASP LLM01NIST MEASURE-2.3ATLAS T0051
  2. mediumexcessive agencyf-r5-get_addon_info

    Tool `get_addon_info` description mentions money but no `money` side-effect is declared

    Description: "Get add-on details: plan, state, billing" -- this references money/payment/refund/etc., but the declared side_effects ([]) don't include `money`. A capframe-bind policy that relies on declared side_effects to scope spend caveats will under-scope this tool.

    fix: Add `money` to the tool's `side_effects` declaration, or rewrite the description to clarify that no actual money moves.

    OWASP LLM08NIST MEASURE-2.6ATLAS T0040

About this tool

get_addon_info is one of 33 tools exposed by Heroku MCP. The server scored 8/100 overall against the capframe rule engine (source: sandbox). Last scanned 2026-06-05.

The findings above are emitted by the public capframe.findings.v1 schema. Disagree with one? Open an issue.