Posbuzz

A local MCP server that exposes the PosBuzz / cosmetic-analysis SaaS API (Social Analytics API v1) as MCP tools, so you can call it from MCP clients like Claude Code, Codex, and Claude Desktop.

It works by fetching the SaaS OpenAPI spec at startup, turning every endpoint into an MCP tool, and forwarding tool calls to the SaaS API using your bearer token.

This is a local, stdio MCP server — not a remote/hosted MCP. It runs as a local process on your machine, talks to the client over standard input/output, opens no HTTP port, and exposes no public endpoint. Your API key stays on your machine.

Requirements

• uv installed (it ships the uvx launcher and manages Python for you — you do not need to install Python yourself)
• A SaaS API key

Get a SaaS API key

In the web app, go to Settings → Developer API and issue a key. The token looks like sa_.... Keep it secret — treat it like a password.

Quick start (no clone — recommended)

You don't need to clone this repo or install anything by hand. uvx fetches the server straight from GitHub, builds it in an isolated environment, and runs it — all in one command. The first run downloads and caches it; later runs start instantly. The only configuration you need is your API key.

Add this to your MCP client's config:

{
  "mcpServers": {
    "posbuzz": {
      "command": "uvx",
      "args": ["--from", "git+https://github.com/pos-buzz/posbuzz-mcp@main", "posbuzz-mcp"],
      "env": {
        "SAAS_API_KEY": "sa_your_api_key"
      }
    }
  }
}

By default the server talks to the production API at https://pos-buzz.com, so SAAS_API_KEY is the only thing you have to set.

Claude Code

One command — no config file editing:

claude mcp add posbuzz \
  --env SAAS_API_KEY=sa_your_api_key \
  -- uvx --from git+https://github.com/pos-buzz/posbuzz-mcp@main posbuzz-mcp

Codex

Add to ~/.codex/config.toml:

[mcp_servers.posbuzz]
command = "uvx"
args = ["--from", "git+https://github.com/pos-buzz/posbuzz-mcp@main", "posbuzz-mcp"]
env = { SAAS_API_KEY = "sa_your_api_key" }

After editing the config, restart your MCP client.

Getting updates

uvx caches the version it pulled from @main, so it won't pick up new commits automatically. To upgrade to the latest, run it once with --refresh:

uvx --refresh --from git+https://github.com/pos-buzz/posbuzz-mcp@main posbuzz-mcp

(then restart your MCP client). You can also pin a release tag instead of @main, e.g. git+https://github.com/pos-buzz/[email protected].

Configuration

Set configuration via environment variables (via your MCP client's env).

Variable	Required	Default	Purpose
SAAS_API_KEY	yes	—	SaaS API bearer token (sa_...)
API_BASE_URL	no	https://pos-buzz.com	SaaS API base URL (spec is fetched from <API_BASE_URL>/api-docs/v1/openapi.yaml)
MCP_NAME	no	posbuzz-mcp	MCP server name shown to the client
LOG_LEVEL	no	INFO	Logging level (e.g. DEBUG)

The defaults point at production, so a normal user only sets SAAS_API_KEY. Copy .env.example to .env for local reference (the .env file is gitignored and is not read automatically — pass values via your MCP client's env).

Local development

If you're hacking on the server itself, clone the repo and run from source.

Using uv

git clone https://github.com/pos-buzz/posbuzz-mcp.git
cd posbuzz-mcp
uv run posbuzz-mcp        # creates the env and runs the server (stdio)
# or run from anywhere:  uvx --from . posbuzz-mcp

Using pip

git clone https://github.com/pos-buzz/posbuzz-mcp.git
cd posbuzz-mcp
pip install .
posbuzz-mcp               # console script
# or:  python -m posbuzz_mcp

To point a local checkout at a locally running SaaS app instead of production, override the URLs in your env:

API_BASE_URL=http://localhost:3000 \
uv run posbuzz-mcp

A matching MCP client config (Claude Code, Codex, or generic JSON) uses "command": "uv" with "args": ["run", "--directory", "/abs/path/to/posbuzz-mcp", "posbuzz-mcp"], or for a pip install just "command": "posbuzz-mcp".

Note: the repo must be public for the uvx --from git+https://... quick start to work without auth. If it ever becomes private, authenticate the Git fetch with a token (git+https://<token>@github.com/...) or SSH (git+ssh://[email protected]/pos-buzz/posbuzz-mcp.git).

How it works

• The OpenAPI spec is fetched at startup from <API_BASE_URL>/api-docs/v1/openapi.yaml.
• Spec changes take effect only after you restart the server (restart the MCP client, or restart the process). There is no live watching or regeneration.
• The available tools are derived entirely from the SaaS OpenAPI spec. As the SaaS API evolves, the tools change accordingly.

Available tools

The available tools are generated from the SaaS OpenAPI spec at startup, so they always match the current API. For the full list of endpoints and their parameters, see the API Doc.

Destructive / write operations

Some tools map to write operations (e.g. POST endpoints), and some of these may consume quota. Refer to the API Doc to see which endpoints write or have side effects, and review arguments before approving these calls in your client.

Security

• Never commit or share your .env file or your API key.
• .env is listed in .gitignore.
• The token is sent only as Authorization: Bearer <token> to the SaaS API. It is not logged and is not included in error messages.

Troubleshooting

• Failed to fetch OpenAPI spec ... — the SaaS app isn't reachable or API_BASE_URL is wrong. Verify with curl http://localhost:3000/api-docs/v1/openapi.yaml.
• SAAS_API_KEY is required — no token in the environment passed to the server. Add it to your MCP client's env.
• 401 Unauthorized on tool calls — the key is invalid or revoked. Issue a new one in Settings → Developer API.
• Connection refused on tool calls — API_BASE_URL is wrong or the SaaS app isn't running.
• For more detail, set LOG_LEVEL=DEBUG.