gsa-calc-mcp

MCP server for the GSA CALC+ Labor Ceiling Rates API. Query awarded GSA MAS schedule hourly rates for IGCE development, price reasonableness analysis, and market research.

No authentication required. Works with any MCP-compatible client.

Tested and hardened through six audit rounds against the GSA CALC+ API. 352 regression tests (247 offline, 105 live-gated) covering 49 P1 bugs (19 crashes, 30 silent-wrong-data), 19 P2 validation gaps, 12 retroactive deep-audit findings, and the round-6 differential-count fixes (dead worksite filter, experience-range semantics, rate-card paging). See testing.md for the full testing record.

What it does

Exposes the GSA CALC+ API as 8 MCP tools:

Core search

• keyword_search - Wildcard search across labor categories, vendors, and contract numbers
• exact_search - Exact field match (use suggest_contains to discover values first)
• suggest_contains - Autocomplete/discovery for field values (2-char minimum)
• filtered_browse - Browse with filters only (no keyword)

Workflow tools

• igce_benchmark - Rate statistics for IGCE development (min/max/avg/median/percentiles)
• price_reasonableness_check - Evaluate a proposed rate against market distribution
• vendor_rate_card - All rates for a vendor (auto-discovers exact name)
• sin_analysis - Rate distribution for a GSA SIN

No authentication required

The GSA CALC+ API is public. 1,000 requests/hour rate limit.

Installation

uvx gsa-calc-mcp

Or from source:

git clone https://github.com/1102tools/federal-contracting-mcps.git
cd federal-contracting-mcps/servers/gsa-calc-mcp
pip install -e .

Claude Desktop configuration

{
  "mcpServers": {
    "gsa-calc": {
      "command": "uvx",
      "args": ["gsa-calc-mcp"]
    }
  }
}

Example prompts

• "What are the GSA ceiling rates for Senior Software Developer with a BA and 10+ years experience?"
• "Is $195/hr reasonable for a Cybersecurity Analyst? Check against CALC+ rates."
• "Pull the full rate card for Booz Allen Hamilton from GSA CALC+."
• "What does the IT Professional Services SIN (54151S) rate distribution look like?"
• "Build IGCE benchmarks for these 5 labor categories: Program Manager, Systems Engineer, Software Developer, Help Desk Specialist, Network Administrator."
• "Find all small business ceiling rates for project management between $100-$200/hr."

Important: ceiling rates, not prices paid

CALC+ data represents the maximum hourly rate a contractor can charge under their GSA MAS contract. Actual task order rates should be lower per FAR 8.405-2(d). These rates are:

• Fully burdened (includes fringe, overhead, G&A, profit)
• Worldwide (no geographic adjustment)
• Master contract-level (not task order-specific)
• From vendor Price Proposal Tables (self-reported by contractors)

Always note sample size and remind users these are ceiling rates when presenting analysis.

License

MIT