serper-toolkit 0.0.13

A high-performance, asynchronous MCP server for Serper Google Search, featuring connection pooling, request retries, and intelligent input parsing.

Serper MCP Toolkit

A rebuilt Serper MCP server based on the firecrawl-toolkit architecture.

Highlights

• Unified async request layer (httpx + connection pooling + retries)
• Compact JSON responses (single-line) for lower token usage
• Stable mapped response schemas (no upstream raw passthrough)
• Multi-page aggregation for non-image search endpoints (10 results/page granularity)
• Image search search_num normalization to 10 or 100
• Multi-transport startup (STDIO / HTTP / SSE, mutually exclusive)
• Process lock to prevent duplicate server instances

Tools

• serper-aggregated-search
• serper-general-search
• serper-image-search
• serper-video-search
• serper-place-search
• serper-maps-search
• serper-reviews-search
• serper-news-search
• serper-lens-search
• serper-scholar-search
• serper-shopping-search
• serper-patents-search
• serper-scrape

Core Parameter Rules

• Search tools do not expose page; internal pagination is automatic.
• Non-image endpoints:
  • search_num is clamped to 1..100
  • then rounded up to nearest multiple of 10 (25 -> 30)
• Image endpoint:
  • 1..10 -> 10, 11..100 -> 100
• Maps endpoint:
  • when aggregation requires page > 1 and query mode is used, ll is required.

Environment Variables

API and network

• SERPER_API_KEY
• SERPER_HTTP2 (0/1)
• SERPER_MAX_CONNECTIONS
• SERPER_KEEPALIVE
• SERPER_MAX_CONCURRENT_REQUESTS
• SERPER_MAX_WORKERS
• SERPER_RETRY_COUNT
• SERPER_RETRY_BASE_DELAY
• SERPER_ENDPOINT_CONCURRENCY (JSON, e.g. {"search":10,"scrape":2})
• SERPER_ENDPOINT_RETRYABLE (JSON, e.g. {"scrape":false})

Transport selection (exactly one must be enabled)

• SERPER_MCP_ENABLE_STDIO
• SERPER_MCP_ENABLE_HTTP
• SERPER_MCP_ENABLE_SSE

Transport host/port

• SERPER_MCP_HTTP_HOST
• SERPER_MCP_HTTP_PORT
• SERPER_MCP_SSE_HOST
• SERPER_MCP_SSE_PORT
• SERPER_MCP_HOST (fallback)
• SERPER_MCP_PORT (fallback)

Lock file

• SERPER_MCP_LOCK_FILE (default /tmp/serper_mcp.lock on Unix)

MCP Client Example

{
  "mcpServers": {
    "serper-toolkit": {
      "command": "uvx",
      "args": ["serper-toolkit"],
      "env": {
        "SERPER_API_KEY": "<your-serper-api-key>",
        "SERPER_MCP_ENABLE_STDIO": "1"
      }
    }
  }
}

CI/CD

Two GitHub Actions workflows are included:

• CI (.github/workflows/ci.yml)

  • Trigger: push/PR on main
  • Python matrix: 3.12, 3.13
  • Steps: alias validation, unit tests, build, twine check

• Publish to PyPI (.github/workflows/publish-pypi.yml)

  • Trigger: push on main (automatic), plus manual workflow_dispatch
  • Preflight: alias validation, tests, build, twine check, version-not-on-PyPI check
  • Publish: trusted publishing via OIDC to PyPI

Required repository settings

1. Create GitHub Environment: pypi
2. Configure PyPI Trusted Publisher for this repo/workflow/branch:
   • Workflow file: .github/workflows/publish-pypi.yml
   • Branch: main
3. Ensure Actions permissions allow OIDC (id-token: write in workflow is already set)

Development Validation

python3 scripts/validate_country_aliases.py
python3 -m unittest discover -s tests -p "test_*.py"
python3 -m build
python3 -m twine check dist/*

License

MIT