# eCFR MCP server

> Read, search and compare Code of Federal Regulations text, including the FAR, DFARS and agency supplements.

- Listing: https://mcp.tc/i/ecfr
- Connect: use the server's own URL `https://ecfr.1102tools.com/mcp` (no sign-in); clients connect to it directly. The listing link is a page, not an MCP endpoint.
- Type: remote (Streamable HTTP)
- Auth: none
- Category: [Docs & Knowledge](https://mcp.tc/c/docs-knowledge)
- Vendor: 1102tools
- Homepage: <https://1102tools.com>
- Repository: <https://github.com/1102tools-dev/federal-contracting-mcps/tree/HEAD/servers/ecfr-mcp>
- Package: pypi `ecfr-mcp`

## About

Connects to the public eCFR API and returns parsed regulatory text. You can fetch sections, subparts and parts, browse the CFR structure, search the full text, check version history and corrections, and compare a section at two dates. Convenience tools look up FAR and DFARS clauses and FAR 2.101 definitions.

Runs as a hosted streamable HTTP endpoint at https://ecfr.1102tools.com/mcp, or locally with the ecfr-mcp package via uvx. No sign-in or API key is needed, hosted or local.

## What it can do

- Get parsed text of CFR sections, subparts, parts and appendices
- Look up FAR, DFARS and agency supplement clauses by number
- Full-text search across the CFR with title, chapter and part filters
- Compare a section's text at two dates and see what changed
- Find sections changed since a given date
- Find term definitions in FAR 2.101
- View version history and editorial corrections
- Browse CFR structure and list agencies

## Tools (13)

- `compare_versions`: Compare a CFR section's text at two dates and list added, removed or changed paragraphs. (read-only)
- `find_far_definition`: Find a term's definition in FAR 2.101, with other paragraphs that mention it. (read-only)
- `find_recent_changes`: List CFR sections amended or removed since a given date. (read-only)
- `get_ancestry`: Get the breadcrumb hierarchy path for a section, part or appendix. (read-only)
- `get_cfr_content`: Get the parsed full text of a CFR section, subpart, part or appendix. (read-only)
- `get_cfr_structure`: Get the hierarchical table of contents for a CFR title or subset. (read-only)
- `get_corrections`: Get editorial corrections for a CFR title, newest first. (read-only)
- `get_latest_date`: Get the most recent available date for a CFR title. (read-only)
- `get_version_history`: Get the version history of a CFR section, subpart or part. (read-only)
- `list_agencies`: List agencies with their CFR title and chapter references. (read-only)
- `list_sections_in_part`: List all sections and appendices in a CFR part with headings. (read-only)
- `lookup_far_clause`: Look up current text of a FAR, DFARS or supplement section or clause. (read-only)
- `search_cfr`: Full-text search across the CFR, returning current sections with excerpts. (read-only)

## Example prompts

- "Pull the current text of FAR 15.305 and summarize what it requires."
- "Compare FAR 52.212-4 between 2024-01-01 and 2025-01-01 and show what changed."
- "Look up the FAR definition of 'commercial product' in 2.101."
- "What FAR sections were amended in the last 6 months?"

## Install

### Claude Code

1. Run this in a terminal, in your project folder:

```bash
claude mcp add --transport http ecfr https://ecfr.1102tools.com/mcp
```

2. Start Claude Code and type `/mcp`. **ecfr** should show as connected.

Add `--scope user` to make it available in every project, not just this one.

### Claude Desktop

1. Open **Customize → Connectors**, click **+ Add**, then **Add custom connector**.

2. Name it **eCFR** and paste this URL:

```url
https://ecfr.1102tools.com/mcp
```

3. Click **Add**. Its tools appear in the chat’s tools menu.

Claude Desktop’s JSON config file only starts local servers. Remote servers go through Connectors, and connectors you add on claude.ai show up here too.

### claude.ai

1. Open the connector form on claude.ai. This button fills in the name and URL for you:

[Add to claude.ai](<https://claude.ai/customize/connectors?modal=add-custom-connector&connectorName=eCFR&connectorUrl=https%3A%2F%2Fecfr.1102tools.com%2Fmcp>) (opens connector settings)

2. Check that the URL reads `https://ecfr.1102tools.com/mcp` and click **Add**.

3. Turn it on in a chat from the tools menu.

Free plans allow one custom connector. On Team and Enterprise plans an owner adds it under **Organization settings → Connectors**.

### ChatGPT

1. On chatgpt.com, go to **Plugins**, select **+**, then **Add custom MCP server**.

2. Enter a name for the server.

3. Under **Connection**, paste `https://ecfr.1102tools.com/mcp` as the server URL, then for authentication choose **No authentication**.

4. Check **I understand and want to continue**, then select **Create as a plugin**.

Whether you can add a custom MCP server depends on your ChatGPT plan and your workspace permissions (in Business workspaces, admins and owners can).

### Cursor

[Add to Cursor](<https://cursor.com/install-mcp?name=ecfr&config=eyJ1cmwiOiJodHRwczovL2VjZnIuMTEwMnRvb2xzLmNvbS9tY3AifQ%3D%3D>) (opens Cursor)

Or add it by hand to `~/.cursor/mcp.json` (all projects) or `.cursor/mcp.json` (this project):

`mcp.json`:

```json
{
  "mcpServers": {
    "ecfr": {
      "url": "https://ecfr.1102tools.com/mcp"
    }
  }
}
```

### VS Code

[Install in VS Code](<https://vscode.dev/redirect/mcp/install?name=ecfr&config=%7B%22type%22%3A%22http%22%2C%22url%22%3A%22https%3A%2F%2Fecfr.1102tools.com%2Fmcp%22%7D>) (opens VS Code)

Or from a terminal:

```bash
code --add-mcp '{"name":"ecfr","type":"http","url":"https://ecfr.1102tools.com/mcp"}'
```

Or commit it to the repo in `.vscode/mcp.json`:

`.vscode/mcp.json`:

```json
{
  "servers": {
    "ecfr": {
      "type": "http",
      "url": "https://ecfr.1102tools.com/mcp"
    }
  }
}
```

### Devin Desktop

1. Add it to `~/.config/devin/mcp_config.json` (macOS and Linux) or `%APPDATA%\devin\mcp_config.json` (Windows):

`mcp_config.json`:

```json
{
  "mcpServers": {
    "ecfr": {
      "serverUrl": "https://ecfr.1102tools.com/mcp"
    }
  }
}
```

2. Refresh the MCP server list in Cascade.

Devin Desktop is the new name for Windsurf. It reads `serverUrl` (or `url`) for remote servers.

### Codex

```bash
codex mcp add ecfr --url https://ecfr.1102tools.com/mcp
```

Or edit `~/.codex/config.toml` directly:

`config.toml`:

```toml
[mcp_servers.ecfr]
url = "https://ecfr.1102tools.com/mcp"
```

### Gemini CLI

```bash
gemini mcp add --transport http ecfr https://ecfr.1102tools.com/mcp
```

This adds it to the current project. Add `-s user` to use it everywhere.

### Any client

Most clients accept this shape. Some name the URL field differently: `serverUrl` in Devin Desktop, `httpUrl` in Gemini CLI’s settings file.

```json
{
  "mcpServers": {
    "ecfr": {
      "type": "http",
      "url": "https://ecfr.1102tools.com/mcp"
    }
  }
}
```

Zed puts servers under `context_servers` in its settings. Cline needs `"type": "streamableHttp"`, or it assumes SSE.

Client only starts local servers? Bridge it with `npx -y mcp-remote https://ecfr.1102tools.com/mcp`.

## Recent changes

- 2026-11-03 08:52 UTC: New version 1.1.15 (was 1.1.14), reported by the server. Source: automatic check.
- 2026-11-01 05:22 UTC: Tracking started: 13 tools read. Source: automatic check.

More on the History tab, with descriptions before and after for the newest entries: https://mcp.tc/i/ecfr#history (Atom feed: https://mcp.tc/i/ecfr/history.xml). It records what mcp.tc's anonymous checks saw, every 3 hours where the tool list can be read without sign-in; it is not a security review.

## Details

- Server version: 1.1.15
- MCP protocol version: 2026-07-28
- Last checked: 2026-11-06 (reachable)
- Listed: 2026-11-01
- Updated: 2026-11-01

---
Source: https://mcp.tc/i/ecfr (mcp.tc is an independent directory, not affiliated with this server's publisher). Corrections: https://mcp.tc/report