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mcp-openapi-proxy: Instructions file for Codex

AGENTS.md

mcp-openapi-proxy AGENTS.md is an instructions file for Codex, OpenCode from rendis/mcp-openapi-proxy. It costs 1,804 tokens per session, scanned B, original, MIT.

Project instructions for a Go command-line server that turns OpenAPI 3.x descriptions into an MCP server.

In plain words
What is it for?
Use it when developing a server that lists, describes, and calls API endpoints from an OpenAPI document through MCP.
Why use it?
It explains how the specification is parsed, how endpoint tools are named, and how requests, authentication, responses, and limits are handled.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: reads $CODEX_HOME, but also the file is AGENTS.md. Also seen: mentions Claude Code; reads ~/.codex paths; mentions Codex.

This is rendis/mcp-openapi-proxy's own configuration. It tells Codex and OpenCode how to work on mcp-openapi-proxy itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything mcp-openapi-proxy configures →

not rated 1repo 6mo ago B scan 1,804 tokens original MIT
View source ↗ rendis/mcp-openapi-proxy
Reuse

Borrowing it

Nothing to install: this file belongs to rendis/mcp-openapi-proxy. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/rendis/mcp-openapi-proxy/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/rendis/mcp-openapi-proxy

Made for: Codex, OpenCode.

Wrote this? Show the measurements

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<a href="https://agentmods.dev/instructions/rendis/mcp-openapi-proxy/agents-md"><img src="https://agentmods.dev/badge/instructions/rendis/mcp-openapi-proxy/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 1,804 This file is loaded in full into every session.
When invoked 1,804 The same file — it is already loaded in full.
Security scan B 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.01804 $0.01804
Opus 5.5 $0.00722 $0.00722
Sonnet 5.5 $0.00361 $0.00361
Haiku 4.5 $0.00180 $0.00180

Measured 2mo ago against content hash ed66b61704c3, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

mcp-openapi-proxy AGENTS.md scanned grade B with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Reads agent configuration directoriesmediumAgent snooping

.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.

- Claude Code uses `.mcp.json`; Codex global install uses `codex mcp add <name> ... -- mcp-openapi-proxy`; Codex project-local config is manual in `./.codex/config.toml`
AGENTS.md · 81 lines

How it starts

The opening of the file, as written. The whole thing — 81 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Agent Instructions

Project

Go CLI that converts OpenAPI 3.x specs into a lightweight MCP stdio navigator/executor — 3 MCP tools plus indexed endpoint toolName identifiers, no codegen.

Architecture

  • cmd/mcp-openapi-proxy/main.go — CLI entry point, env var parsing, subcommands: serve/login/logout/status
  • pkg/spec/model.go — internal OpenAPI model types: endpoints, params, media types, security, servers
  • pkg/spec/parser.go — OpenAPI 3.x parser (kin-openapi), validates the spec and extracts Endpoint structs
  • pkg/server/server.go — MCP server setup, stdio transport
  • pkg/server/generator.go — endpoint toolName / path sanitization helpers
  • pkg/server/navigator.go — endpoint index plus the 3 registered MCP tools: list/describe/call
  • pkg/server/schema.go — JSON Schema generation for the lightweight navigator tool inputs plus response helpers
  • pkg/server/runtime.go — request serialization, auth application, HTTP execution, MCP envelope responses
  • pkg/client/client.go — HTTP client execution, content-type aware decoding, response body limits
  • pkg/client/errors.go — client transport/body limit errors
  • pkg/auth/provider.go — TokenProvider interface + StaticTokenProvider
  • pkg/auth/resolver.go — resolves OpenAPI security requirements to concrete HTTP auth material
  • pkg/auth/oidc_provider.go — OIDC token storage, auto-refresh (30s margin)
  • pkg/auth/discovery.go — OIDC .well-known/openid-configuration endpoint discovery
  • pkg/auth/login.go — Browser-based OIDC Authorization Code + PKCE flow
  • pkg/auth/logout.go — Token file removal
  • pkg/auth/status.go — Auth state display

Key Dependencies

  • github.com/getkin/kin-openapi — OpenAPI 3.x parsing
  • github.com/modelcontextprotocol/go-sdk — MCP server (go-sdk v0.4.0)
  • github.com/google/jsonschema-go — JSON Schema for tool inputs

Build & Run

  • Install latest binary: go install github.com/rendis/mcp-openapi-proxy/cmd/mcp-openapi-proxy@latest
  • go build -C . -o bin/mcp-openapi-proxy ./cmd/mcp-openapi-proxy
  • Config is 100% env vars: MCP_SPEC, optional MCP_BASE_URL, MCP_TOOL_PREFIX, MCP_AUTH_PROFILE, MCP_AUTH_TOKEN, MCP_OIDC_ISSUER, MCP_OIDC_CLIENT_ID, MCP_OIDC_SCOPES, MCP_EXTRA_HEADERS, MCP_MAX_BODY_BYTES, MCP_ALLOW_INSECURE_HTTP, MCP_EXCLUDE_DEPRECATED, plus MCP_AUTH_<SCHEME>_*
  • Claude Code uses .mcp.json; Codex global install uses codex mcp add <name> ... -- mcp-openapi-proxy; Codex project-local config is manual in ./.codex/config.toml
  • Static token path: put MCP_AUTH_TOKEN in the MCP client config entry
  • OIDC login examples:
    • mcp-openapi-proxy login
    • mcp-openapi-proxy login my-api
    • mcp-openapi-proxy login --mcp-config ./path/to/.mcp.json
    • mcp-openapi-proxy login --mcp-config ./path/to/.mcp.json --server my-api
    • mcp-openapi-proxy login --codex-server my-api
    • mcp-openapi-proxy login --codex-config ~/.codex/config.toml
    • mcp-openapi-proxy login --codex-config ~/.codex/config.toml --server my-api

Read the full file on GitHub · 81 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2mo ago First seen · 81 lines · 1,804 tokens per session scan B ed66b61704c3

Subscribe to this mod's changes

mcp-openapi-proxy AGENTS.md is an instructions file published in the GitHub repository rendis/mcp-openapi-proxy (1 stars, last pushed 6mo ago), licensed MIT. It adds 1,804 tokens to every session, about $0.0072 per session on Opus 5.5. A static security scan graded it B with 1 finding (reads agent configuration directories). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Backend and APIsClaude Codeai-agentscodexgemini-cligomcp
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