simplesat-mcp

MCP server for Simplesat (CSAT/NPS customer feedback survey platform). Exposes the Simplesat V1 API's answer search as an MCP tool.

Naming note: Simplesat has two generations of integration in MSPbots — a legacy 2021-era integration (subjectCode=SIMPLESAT, GET /api/answers/, a token field) and the current one this server targets (subjectCode=SIMPLESATV1, POST /api/v1/answers/search, an apiKey field). Only the current V1 API is covered here.

Overview

• Stateless HTTP service. No credentials are ever persisted — each request supplies its own API key via a header, used only for the lifetime of that single request.

• Supports concurrent requests; per-request credential isolation is done via Python contextvars, not a global/shared client instance.

• Entry points: POST /mcp (MCP protocol) and GET /health (health check).

• Default port: 8080 (configurable via MCP_HTTP_PORT).

Authentication

Simplesat uses a single static API key — no login or token exchange:

X-Simplesat-Token: <api key>

Already fully stateless by the vendor's own design; nothing is cached across MCP calls.

HEADER 授权参数说明

Missing the header returns 401:

{
  "error": "Missing credentials",
  "message": "This server requires the X-Simplesat-Api-Key header",
  "required_headers": ["X-Simplesat-Api-Key"],
  "optional_headers": []
}

An invalid key surfaces as a tool-level structured error envelope (e.g. {"error":{"code":"unauthorized","message":"Invalid Token.","retryable":false}}), not an HTTP-level error from this server — see the error envelope format under Tool List below.

Environment Variables

MCP Endpoint

• POST /mcp — MCP protocol (streamable HTTP transport)

• GET /health — health check, pure local probe (does not depend on the Simplesat API), returns {"status": "ok"}

Tool List

• page_size is clamped server-side to Simplesat's own documented maximum of 100 records per page (stricter than it might otherwise be) — values above 100 are silently capped rather than rejected upstream.

• Responses are compact JSON (no pretty-printing, ensure_ascii=False), and are truncated with truncated/original_count markers if a result would exceed ~20,000 characters.

• Errors are returned as a structured envelope, not a plain string: {"error": {"code": "...", "message": "...", "retryable": true|false}}. code is one of not_configured / unauthorized / not_found / invalid_argument / rate_limited / upstream_error.

测试示例

# Health check
curl -s http://localhost:8080/health

# Call a tool via the MCP protocol (streamable HTTP) — requires an
# initialize handshake first per the MCP spec; abbreviated example below
# shows the tool-call request body only:
curl -s -X POST http://localhost:8080/mcp \
  -H "X-Simplesat-Api-Key: <your-api-key>" \
  -H "Content-Type: application/json" \
  -H "Accept: application/json, text/event-stream" \
  -H "mcp-session-id: <session-id-from-initialize>" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "tools/call",
    "params": {
      "name": "simplesat_search_answers",
      "arguments": {}
    }
  }'

Live-verified (2026-07-31) against a real Simplesat account: simplesat_search_answers called end-to-end through this running server with the real API key returned 200 and the vendor's correctly-shaped response ({"next": null, "previous": null, "count": 0, "answers": []}) — this particular test account has zero survey answers recorded yet, confirmed as a genuine empty result (not an auth failure) since the response shape exactly matches the vendor's documented schema. A separate test with a deliberately invalid API key correctly surfaced the structured error envelope {"error":{"code":"unauthorized","message":"Invalid Token.","retryable":false}}, confirming the auth failure path works as expected (re-verified 2026-08-19 after the error format was changed from a plain string to this structured envelope).

API Reference

• Public, no login required: https://developer.simplesat.io/api (full V1 API reference, including the Search Answers operation used here)

Known Gaps

• Scope is exactly the 1 method MSPbots' current integration uses (Search answers) — the Simplesat V1 API also covers Customers, Team members, Responses, Surveys, and Questions, plus Get answer by ID and Update answer by ID; those are out of scope here.

• simplesat_search_answers could not be verified with non-empty results — the test account has zero recorded survey answers. Auth and request-shape correctness were confirmed via (1) a 200 response matching the vendor's exact documented response schema, and (2) a separate invalid-key test correctly returning a 403 Invalid Token error.

• The filter_key/filter_values/filter_comparison parameters expose only a single filter object — the vendor's API technically accepts an array of filter objects for compound filtering, but MSPbots' own usage of this integration sends no filters at all, so this server keeps the tool signature simple rather than exposing arbitrary multi-filter arrays.