GSA CALC+

Eight free and open source MCP servers for federal contracting data and policy tracking, packaged as Claude Desktop Extensions (.mcpb) for one-click install.

No Terminal. No uv install. No JSON config editing. Double-click a .mcpb file, Claude Desktop prompts for the API key if one is needed, and the tools register automatically.

The eight MCPs

All source lives under servers/<name>/. Each server is self-contained: manifest, code, tests, per-server README.

Procurement data

• sam-gov-mcp — SAM.gov entity registration, exclusions, opportunities, contract awards (FPDS replacement), federal hierarchy, FFATA subawards
• usaspending-gov-mcp — federal contract, award, FFATA subaward, recipient, agency, and Treasury federal account data
• gsa-calc-mcp — GSA CALC+ awarded NTE hourly rates from MAS contracts (230K+ records)
• bls-oews-mcp — BLS OEWS market wage data across ~830 occupations and 530+ metros
• gsa-perdiem-mcp — federal travel lodging and M&IE rates for all CONUS

Regulatory and policy tracking

• ecfr-mcp — current CFR text updated daily, FAR / DFARS / agency supplement lookups
• federal-register-mcp — proposed rules, final rules, notices, executive orders, FAR cases
• regulations-gov-mcp — federal rulemaking dockets, public comments, comment period tracking

Combined: 82 deterministic tool calls, 2,639 regression tests, 8 audit programs, roughly 350 bugs fixed during hardening.

Install

1. Install Claude Desktop.
2. Register the free API keys you need: BLS, api.data.gov (covers Per Diem and Regulations.gov), SAM.gov. USASpending, GSA CALC+, eCFR, and Federal Register need no key.
3. Download each .mcpb file from Releases, double-click, and follow the prompt.

Power users: every server subdirectory has its own README with uvx and pip instructions for manual install in any MCP client (Claude Desktop, Claude Code, Cursor, Cline, Zed, Continue).

Repo layout

federal-contracting-mcps/
├── servers/
│   ├── bls-oews-mcp/
│   ├── ecfr-mcp/
│   ├── federal-register-mcp/
│   ├── gsa-calc-mcp/
│   ├── gsa-perdiem-mcp/
│   ├── regulations-gov-mcp/
│   ├── sam-gov-mcp/
│   └── usaspending-gov-mcp/
├── license
└── readme.md

Each server directory ships its own manifest.json (MCPB), pyproject.toml, source, regression tests, and testing record.

Companion repo

federal-contracting-skills — Claude Skills that orchestrate these MCPs into complete acquisition deliverables: SOW/PWS Builder, three IGCE Builders (FFP, LH/T&M, Cost-Reimbursement), OT Project Description Builder, OT Cost Analysis.

MCPs handle data. Skills handle deliverables.

Why MCPs (and not skills for the API calls)

• Deterministic. MCP servers execute tested Python. Claude does not generate API-call code on the fly. Same input, same output.
• One-click install. .mcpb bundles prompt for API keys at install time and register tools automatically. Contracting officers install them the same way they install any app.
• Low context cost. Tool schemas are ~100 tokens each. The deprecated API-data skills cost 500-1000 lines of context per run.
• Production-hardened. Each MCP went through 3-6 audit rounds with live testing against its production API.
• Cross-client. MCP is an open standard. Same servers run in Claude Desktop, Claude Code, Cursor, Cline, Zed, Continue.

Website

1102tools.com

License

MIT

Author

Built by James Jenrette, lead systems analyst and contracting officer. Independently developed and not endorsed by any federal agency.