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OpenAPI SchemaSAFE

mcp/hannesj/openapi-schema
MCP server by hannesj · Audited 2026-10-08
⚑ Report / re-scanSource ↗

OpenAPI Schema Model Context Protocol Server

Verdict
SAFE
Grade
B
Trust score
89 /100
Exposed tools
10 10r · 0w · 0d
Transport
stdio
License
—
Stars
49
01

Overview

From the repository's own README, as read at the audited commit. Badges and raw HTML are left out.

A Model Context Protocol (MCP) server that exposes OpenAPI schema information to Large Language Models (LLMs) like Claude. This server allows an LLM to explore and understand OpenAPI specifications through a set of specialized tools.

Features

  • Load any OpenAPI schema file (JSON or YAML) specified via command line argument
  • Explore API paths, operations, parameters, and schemas
  • View detailed request and response schemas
  • Look up component definitions and examples
  • Search across the entire API specification
  • Get responses in YAML format for better LLM comprehension

Usage

Command Line

Run the MCP server with a specific schema file:

# Use the default openapi.yaml in current directory
npx -y mcp-openapi-schema

# Use a specific schema file (relative path)
npx -y mcp-openapi-schema ../petstore.json

# Use a specific schema file (absolute path)
npx -y mcp-openapi-schema /absolute/path/to/api-spec.yaml

# Show help
npx -y mcp-openapi-schema --help

Claude Desktop Integration

To use this MCP server with Claude Desktop, edit your claude_desktop_config.json configuration file:

{
"mcpServers": {
"OpenAPI Schema": {
"command": "npx",
"args": ["-y", "mcp-openapi-schema", "/ABSOLUTE/PATH/TO/openapi.yaml"]
}
}
}

Location of the configuration file:

  • macOS/Linux: ~/Library/Application Support/Claude/claude_desktop_config.json
  • Windows: $env:AppData\Claude\claude_desktop_config.json

Claude Code Integration

To use this MCP server with Claude Code CLI, follow these steps:

  1. Add the OpenAPI Schema MCP server to Claude Code
# Basic syntax
claude mcp add openapi-schema npx -y mcp-openapi-schema

# Example with specific schema
claude mcp add petstore-api npx -y mcp-openapi-schema ~/Projects/petstore.yaml
  1. Verify the MCP server is registered
# List all configured servers
claude mcp list

#
Read from source at commit dc8e7f38bd7aOBSERVED · 2026-10-08
02

Connect

Built from this server's own package name, version and transport as found in its source — not copied from anyone's documentation, so it cannot drift against a page we do not control.

claude-code
claude mcp add mcp-openapi-schema -- npx -y [email protected]
claude-desktop
{
  "mcpServers": {
    "mcp-openapi-schema": {
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ]
    }
  }
}
03

Exposed tools (10)

10 read · 0 write · 0 destructive.

ToolRiskDescription
get-componentreadGets detailed definition for a specific component
get-endpointreadGets detailed information about a specific API endpoint
get-examplesreadGets examples for a specific component or endpoint
get-path-parametersreadGets the parameters for a specific path
get-request-bodyreadGets the request body schema for a specific endpoint
get-response-schemareadGets the response schema for a specific endpoint, method, and status code
list-componentsreadLists all schema components (schemas, parameters, responses, etc.)
list-endpointsreadLists all API paths and their HTTP methods with summaries, organized by path
list-security-schemesreadLists all available security schemes
search-schemareadSearches across paths, operations, and schemas
04

Trust audit

SAFEgrade B · trust 89/100 Nothing in the source contradicts what it says it does. Grade A is reserved for packages that have also passed the behavioural sandbox.

LayerWhat it checksResult
L0Provenance & inventoryPASS
L1Static analysis of the codePASS
L2Instruction surface (what it tells the agent)PASS
L3Class-specific surfacePASS
L4Behavioural (sandbox)SKIPPED

What the source does

Filesystem
none-observed
Network
none-observed
Shell
none-observed
Dependencies
not all pinned
Secrets in source
none-found

Findings (2)

LOWInventory / provenance · inv.no_license · CWE-1104
Why it matters. no LICENSE file and no repo licence
Fix. add a licence
LOWSupply chain · supply.unpinned · CWE-829, CWE-1357
package.json
@apidevtools/swagger-parser, @modelcontextprotocol/sdk, js-yaml, zod
Why it matters. 4 dependency range(s) float
Fix. pin exact versions or ship a lockfile

Gates applied: no_behavioural_pass, no_license.

Audited 2026-10-08 · audit v0.4.1 · source sha dc8e7f38bd7afull audit observations/trust-audit/mcp-server/hannesj__openapi-schema.json · Report an issue / request a re-scan
05

Audit history

Every audit this server has had. A grade with a past is a grade somebody is still checking.

DateSourceVerdictGradeScoreChange
2026-10-08dc8e7f38bd7aSAFEB89first audit
06

Questions

What is the OpenAPI Schema MCP server?

OpenAPI Schema Model Context Protocol Server

What tools does OpenAPI Schema expose?

10 in total: 10 read-only, 0 that write, and 0 that can delete or overwrite. Every one is listed on this page with its risk.

Is OpenAPI Schema safe to connect to an agent?

The audit found nothing in the source that contradicts what it says it does, and graded it B (89/100). Grade A is held back for packages that have also passed a sandboxed behavioural run, which is why a clean server reads B.

What credentials does OpenAPI Schema need?

No credential environment variables were found in its source, so it appears to need none.

How does OpenAPI Schema run?

It speaks stdio, so it runs as a local process your client starts. It is published on npm as mcp-openapi-schema at 0.0.1.

How current is this page?

The grade is for one exact copy of the source (dc8e7f38bd7a), read on 2026-10-08. The repository is watched and re-audited when it changes.

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