eCFR — Claude Code MCP server: federal regulations at hand
An MCP server with 13 tools for the electronic Code of Federal Regulations, covering FAR, DFARS and agency supplements.
claude mcp add --transport http ecfr-mcp https://ecfr.1102tools.com/mcpWhat eCFR does
This server hands your agent the text of the US electronic Code of Federal Regulations. Thirteen tools sit behind it, spanning FAR, DFARS and the supplements individual agencies publish. Useful when a rule lookup or a wording check has to happen mid-task.
Two ways to connect: a remote HTTP endpoint at https://ecfr.1102tools.com/mcp, or a local run through uvx ecfr-mcp. The local route needs uvx present — without it the command fails. Claude, Codex and Gemini CLI get ready-made add commands; Cursor and GitHub Copilot take a JSON config block.
MIT licensed, repo at 1102tools-dev/federal-contracting-mcps. Supported clients: Claude, Codex, Cursor, GitHub Copilot, Windsurf (Devin Desktop), Cline, Zed and Gemini CLI.
What it helps with
- pull up a FAR section by number
- check DFARS wording before submitting a claim
- verify a requirement from an agency supplement
- quote a regulation inside a code comment
- look up a defined term in the regulation text
Example prompts for the agent
- Find the FAR section on protest procedures in eCFR
- Show me the DFARS text for this clause
- Which reporting requirement does the agency supplement set?
How to install eCFR
1Platform CLI: remote server
claude mcp add --transport http ecfr-mcp https://ecfr.1102tools.com/mcp2Platform CLI
claude mcp add ecfr-mcp -- uvx ecfr-mcpuvx runs the command named after the package; if the README names another one, use uvx --from ecfr-mcp <command>
1Platform CLI: remote server
codex mcp add ecfr-mcp --url https://ecfr.1102tools.com/mcp2Platform CLI
codex mcp add ecfr-mcp -- uvx ecfr-mcpuvx runs the command named after the package; if the README names another one, use uvx --from ecfr-mcp <command>
Config file
{
"mcpServers": {
"ecfr-mcp": {
"url": "https://ecfr.1102tools.com/mcp"
}
}
}{
"mcpServers": {
"ecfr-mcp": {
"command": "uvx",
"args": [
"ecfr-mcp"
]
}
}
}uvx runs the command named after the package; if the README names another one, use uvx --from ecfr-mcp <command>
Config file
{
"servers": {
"ecfr-mcp": {
"type": "http",
"url": "https://ecfr.1102tools.com/mcp"
}
}
}{
"servers": {
"ecfr-mcp": {
"type": "stdio",
"command": "uvx",
"args": [
"ecfr-mcp"
]
}
}
}uvx runs the command named after the package; if the README names another one, use uvx --from ecfr-mcp <command>
1Platform CLI: remote server
gemini mcp add -t http ecfr-mcp https://ecfr.1102tools.com/mcp2Platform CLI
gemini mcp add ecfr-mcp uvx ecfr-mcpuvx runs the command named after the package; if the README names another one, use uvx --from ecfr-mcp <command>
Step by step, with commands for each platform: How to add an MCP server to Claude Code, Codex, Cursor, VS Code, Gemini CLI and more
Questions about eCFR
How do I install eCFR in Claude Code?
Remote: claude mcp add --transport http ecfr-mcp https://ecfr.1102tools.com/mcp. Local: claude mcp add ecfr-mcp -- uvx ecfr-mcp.
What does eCFR do?
It gives an agent access to the US electronic Code of Federal Regulations through 13 tools, including FAR, DFARS and agency supplements.
What is needed for the local option?
uvx must be installed; uvx ecfr-mcp will not run without it.
