v0.2.0 · live
CAPFRAME
← leaderboard/Heroku MCP/tool · create_addon
§ toolsandboxHeroku MCP

create_addon

on npm:@heroku/mcp-server@1.2.2

Severity

critical0
high1
medium1
low0
info0

2 findings on this tool

  1. highexcessive agencyf-r3-create_addon

    Tool `create_addon` name implies a side effect that is not declared

    `create_addon` looks like a side-effecting tool (its name contains a mutation verb), but its `side_effects` declaration is []. A policy synthesizer cannot produce safe rules for this tool because it cannot tell what it actually does.

    fix: Declare the tool's true side effects explicitly. If the tool is genuinely read-only, rename it to match (e.g. `email.preview` rather than `email.send`).

    OWASP LLM08NIST MEASURE-2.6ATLAS T0051
  2. mediumunconstrained inputf-r1-create_addon

    Tool `create_addon` accepts unconstrained string input

    The following string parameter(s) have no `maxLength` constraint: `app`, `as`, `name`, `serviceAndPlan`. 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

About this tool

create_addon 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.