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opa-mcp-server

opa-mcp-server

by OrygnsCode
OverviewSchemaSourceRelated ServersDiscussionsAdmin
TypeScript
Local

OPA configuration

opa_config
Read-onlyIdempotent

Fetch the running OPA server configuration from /v1/config and redact API keys or bearer tokens in service headers while keeping header names.

Instructions

Return the running OPA server configuration from GET /v1/config. OPA drops the credentials block but returns services.*.headers verbatim, which is the ordinary place to put an API key or a bearer token, so those values are redacted here and the header names kept.

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "opa_config"
  }
}

Input Schema

NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changedv0.9.0
    • addedInput schema / additionalProperties
      Added value: +false
  2. Addedv0.1.13
  3. Removedv0.1.5
  4. Addedv0.1.2
  5. Removedv0.1.1
  6. First observedv0.1.0

TDQS

A4.4/5.0
Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Goes well beyond the readOnly/idempotent annotations by disclosing non-obvious server behavior: OPA drops the `credentials` block, returns `services.*.headers` verbatim, and this tool redacts those values while preserving header names. That redaction behavior is exactly the kind of context an agent needs before calling.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Front-loaded with the endpoint and purpose, then a single dense sentence on redaction semantics. Slightly long but every clause carries information; nothing is wasted.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a zero-parameter, read-only status tool with annotations and no output schema, this covers purpose, endpoint, and the security-relevant mutation of the result. Nothing an agent needs to call it correctly is missing.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The schema has zero parameters and 100% coverage, so per the rubric the baseline is 4. Nothing about argument semantics needs explaining.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb and resource ('Return the running OPA server configuration') and pins it to the concrete endpoint `GET /v1/config`. An agent can immediately distinguish this from sibling configuration/status tools like opa_status or mcp_server_info.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Usage is implied by the endpoints and resource, but the description never states when to reach for this versus opa_status, opa_health, or policy-listing siblings, nor any prerequisite conditions. Adequate but leaves selection to inference.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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