Sherweb MCP Server

An MCP server for the Sherweb Partner APIs, used by MSPs that resell cloud subscriptions (Microsoft 365 and others) through Sherweb. It lets an AI agent read what the MSP owes Sherweb (Distributor API) and the MSP's customers, their subscriptions, catalogs and receivable charges (Service Provider API) and, on explicit request, change a subscription's quantity.

• Transport: MCP Streamable HTTP at POST /mcp, health probe at GET /health

• Stateless and multi-tenant: credentials arrive on every request as HTTP headers and are never stored; access tokens live only for the duration of one request

• Python 3.12, uv, FastMCP, httpx

• License: Apache-2.0, Copyright 2026 MSPbots.ai

Authentication headers

Where to get them:

• In the Sherweb partner portal open Security -> APIs. Create API credentials to get the client id and secret, and copy the subscription key shown for the API subscription.

• Give the client access to the Distributor API (billing tools) and the Service Provider API (customers, subscriptions, catalog). A client that only has one of them can still use that API's tools; sherweb_status shows which ones the credentials reach.

How credentials are sent to Sherweb: the server gets an access token from POST https://api.sherweb.com/auth/oidc/connect/token (client credentials grant, scope distributor or service-provider, requested only when a tool needs that API), then calls https://api.sherweb.com/distributor/v1/... or https://api.sherweb.com/service-provider/v1/... with Authorization: Bearer <token> and Ocp-Apim-Subscription-Key: <subscription key>. Tokens are never reused across requests. Values that look like unresolved templates (${...}) are treated as missing.

A request to /mcp without all three headers gets HTTP 401 naming the missing ones.

Related MCP server: WHMCS MCP Server

Tools

All tools return a JSON string. Customer and subscription ids are UUIDs. Billing tools take any date inside the wanted billing period (yyyy-MM-dd, UTC) and default to the current period.

Errors come back as a JSON envelope instead of an exception:

{"error": {"code": "unauthorized", "message": "Sherweb returned HTTP 401 for customers: Access Denied - Access denied due to invalid subscription key.", "retryable": false}}

code is one of not_configured, unauthorized, not_found, invalid_argument, rate_limited, upstream_error; Sherweb's ProblemDetails title and detail are included. Sherweb allows 3 concurrent requests, 100 requests per minute and 10,000 per day per API. Reads are retried with backoff on 429, 5xx and network errors; the quantity change is retried only on 429, so it never runs twice.

Run locally

uv sync
uv run python -m sherweb_mcp          # listens on 0.0.0.0:8080

or with Docker:

docker build --platform linux/amd64 -t sherweb-mcp:dev .
docker run --rm -p 8080:8080 sherweb-mcp:dev

Configuration (environment variables, all optional): MCP_HTTP_HOST (default 0.0.0.0), MCP_HTTP_PORT (default 8080), LOG_LEVEL (default INFO). Credentials are never read from the environment.

Testing example

# list tools
curl -s http://localhost:8080/mcp \
  -H "Content-Type: application/json" \
  -H "Accept: application/json, text/event-stream" \
  -H "X-Sherweb-Client-ID: your-client-id" \
  -H "X-Sherweb-Client-Secret: your-client-secret" \
  -H "X-Sherweb-Subscription-Key: your-subscription-key" \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list","params":{}}'

# customers whose name contains "example"
curl -s http://localhost:8080/mcp \
  -H "Content-Type: application/json" \
  -H "Accept: application/json, text/event-stream" \
  -H "X-Sherweb-Client-ID: your-client-id" \
  -H "X-Sherweb-Client-Secret: your-client-secret" \
  -H "X-Sherweb-Subscription-Key: your-subscription-key" \
  -d '{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{"name":"sherweb_customers_list","arguments":{"search":"example"}}}'

Unit tests (no network access needed):

uv run pytest

Delivery notes

• Tool count (12). Kept as is because the tool names are an existing contract; every tool is listed from the first tools/list.

• No shared token cache. Older versions cached access tokens in the process under the client id and subscription key, without the secret, so a caller with a wrong secret could reuse a token another caller had obtained. Tokens are now requested per request and per API.

• Quantity changes. sherweb_subscriptions_change_quantity first confirms the subscription exists for that customer and reports the previous quantity; asking for the current quantity changes nothing. Sherweb processes the change asynchronously: poll sherweb_subscriptions_amendment_status with the returned trackingId.

• Subscription details. sherweb_subscriptions_get merges the subscription list (fees) with the details endpoint (status, SKU composition).

• Charge summaries. Payable and receivable charge tools add charge counts and totals per currency so large periods can be read without scanning every charge.

• No interactive prompts. The confirmation prompt older versions showed before a quantity change cannot be relayed by a stateless gateway; the tool description and its destructive annotation tell the agent to act only on explicit request.

License

Apache License 2.0 - see LICENSE and NOTICE.