Who maintains @cyanheads/libofcongress-mcp-server?

@cyanheads/libofcongress-mcp-server is maintained by cyanheads, which publishes 131 MCP servers (2112 total versions) tracked on MCP Toplist.

Is @cyanheads/libofcongress-mcp-server listed on the Official MCP Registry?

Yes — @cyanheads/libofcongress-mcp-server is listed on the Official MCP Registry, alongside PulseMCP and Glama.

How many versions does @cyanheads/libofcongress-mcp-server have?

MCP Toplist tracks 18 versions of @cyanheads/libofcongress-mcp-server, most recently published on Aug 22, 2026.

Where can I find the source code for @cyanheads/libofcongress-mcp-server?

The source code for @cyanheads/libofcongress-mcp-server is hosted at github.com/cyanheads/libofcongress-mcp-server.

SERVER

@cyanheads/libofcongress-mcp-server

Rank #4,241

io.github.cyanheads/libofcongress-mcp-server

Search LOC digital collections, Chronicling America newspapers (full OCR), and LC Subject Headings.

18 versions

4 GitHub stars

by cyanheads (131 servers)View repository ↗Claim this server

First listed

May 24, 2026

Last publish date

Aug 22, 2026

OVERVIEW

@cyanheads/libofcongress-mcp-server is a Model Context Protocol (MCP) server published by cyanheads. It ranks #4,241 of 121,933 servers tracked on MCP Toplist, and its repository has 4 GitHub stars. @cyanheads/libofcongress-mcp-server is listed across 3 registries — Official MCP, PulseMCP and Glama, with 18 tracked versions. It was first listed on May 24, 2026 and most recently updated on Aug 22, 2026.

STANDING

#4,241of 121,933 tracked serversTop 5%

Ranks ahead of 117,692 of 121,933 servers on MCP Toplist.

CONNECT

Use @cyanheads/libofcongress-mcp-server

No setupRuns out of the box

No credentials or required configuration declared — add it to your MCP client and go.

npm package

claude mcp add libofcongress-mcp-server -e "LOC_USER_AGENT=<your LOC_USER_AGENT>" -e "LOC_REQUEST_DELAY_MS=<your LOC_REQUEST_DELAY_MS>" -e "MCP_LOG_LEVEL=<your MCP_LOG_LEVEL>" -e "MCP_SESSION_MODE=<your MCP_SESSION_MODE>" -- npx -y @cyanheads/libofcongress-mcp-server run start:stdio

Replace each placeholder with your own value before saving.

npm package

claude mcp add libofcongress-mcp-server -e "LOC_USER_AGENT=<your LOC_USER_AGENT>" -e "LOC_REQUEST_DELAY_MS=<your LOC_REQUEST_DELAY_MS>" -e "MCP_HTTP_HOST=<your MCP_HTTP_HOST>" -e "MCP_HTTP_PORT=<your MCP_HTTP_PORT>" -e "MCP_HTTP_ENDPOINT_PATH=<your MCP_HTTP_ENDPOINT_PATH>" -e "MCP_AUTH_MODE=<your MCP_AUTH_MODE>" -e "MCP_LOG_LEVEL=<your MCP_LOG_LEVEL>" -e "MCP_SESSION_MODE=<your MCP_SESSION_MODE>" -- npx -y @cyanheads/libofcongress-mcp-server run start:http

Replace each placeholder with your own value before saving.

npm package

[mcp_servers.libofcongress-mcp-server]
command = "npx"
args = ["-y", "@cyanheads/libofcongress-mcp-server", "run", "start:stdio"]

[mcp_servers.libofcongress-mcp-server.env]
LOC_USER_AGENT = "<your LOC_USER_AGENT>"
LOC_REQUEST_DELAY_MS = "<your LOC_REQUEST_DELAY_MS>"
MCP_LOG_LEVEL = "<your MCP_LOG_LEVEL>"
MCP_SESSION_MODE = "<your MCP_SESSION_MODE>"

Add to ~/.codex/config.toml. Replace each placeholder with your own value before saving.

npm package

[mcp_servers.libofcongress-mcp-server]
command = "npx"
args = ["-y", "@cyanheads/libofcongress-mcp-server", "run", "start:http"]

[mcp_servers.libofcongress-mcp-server.env]
LOC_USER_AGENT = "<your LOC_USER_AGENT>"
LOC_REQUEST_DELAY_MS = "<your LOC_REQUEST_DELAY_MS>"
MCP_HTTP_HOST = "<your MCP_HTTP_HOST>"
MCP_HTTP_PORT = "<your MCP_HTTP_PORT>"
MCP_HTTP_ENDPOINT_PATH = "<your MCP_HTTP_ENDPOINT_PATH>"
MCP_AUTH_MODE = "<your MCP_AUTH_MODE>"
MCP_LOG_LEVEL = "<your MCP_LOG_LEVEL>"
MCP_SESSION_MODE = "<your MCP_SESSION_MODE>"

Add to ~/.codex/config.toml. Replace each placeholder with your own value before saving.

npm package

{
  "mcpServers": {
    "libofcongress-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/libofcongress-mcp-server",
        "run",
        "start:stdio"
      ],
      "env": {
        "LOC_USER_AGENT": "<your LOC_USER_AGENT>",
        "LOC_REQUEST_DELAY_MS": "<your LOC_REQUEST_DELAY_MS>",
        "MCP_LOG_LEVEL": "<your MCP_LOG_LEVEL>",
        "MCP_SESSION_MODE": "<your MCP_SESSION_MODE>"
      }
    }
  }
}

Add to claude_desktop_config.json (Settings → Developer → Edit Config). Replace each placeholder with your own value before saving.

npm package

{
  "mcpServers": {
    "libofcongress-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/libofcongress-mcp-server",
        "run",
        "start:http"
      ],
      "env": {
        "LOC_USER_AGENT": "<your LOC_USER_AGENT>",
        "LOC_REQUEST_DELAY_MS": "<your LOC_REQUEST_DELAY_MS>",
        "MCP_HTTP_HOST": "<your MCP_HTTP_HOST>",
        "MCP_HTTP_PORT": "<your MCP_HTTP_PORT>",
        "MCP_HTTP_ENDPOINT_PATH": "<your MCP_HTTP_ENDPOINT_PATH>",
        "MCP_AUTH_MODE": "<your MCP_AUTH_MODE>",
        "MCP_LOG_LEVEL": "<your MCP_LOG_LEVEL>",
        "MCP_SESSION_MODE": "<your MCP_SESSION_MODE>"
      }
    }
  }
}

Add to claude_desktop_config.json (Settings → Developer → Edit Config). Replace each placeholder with your own value before saving.

npm package

{
  "mcpServers": {
    "libofcongress-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/libofcongress-mcp-server",
        "run",
        "start:stdio"
      ],
      "env": {
        "LOC_USER_AGENT": "<your LOC_USER_AGENT>",
        "LOC_REQUEST_DELAY_MS": "<your LOC_REQUEST_DELAY_MS>",
        "MCP_LOG_LEVEL": "<your MCP_LOG_LEVEL>",
        "MCP_SESSION_MODE": "<your MCP_SESSION_MODE>"
      }
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (per project). Replace each placeholder with your own value before saving.

npm package

{
  "mcpServers": {
    "libofcongress-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/libofcongress-mcp-server",
        "run",
        "start:http"
      ],
      "env": {
        "LOC_USER_AGENT": "<your LOC_USER_AGENT>",
        "LOC_REQUEST_DELAY_MS": "<your LOC_REQUEST_DELAY_MS>",
        "MCP_HTTP_HOST": "<your MCP_HTTP_HOST>",
        "MCP_HTTP_PORT": "<your MCP_HTTP_PORT>",
        "MCP_HTTP_ENDPOINT_PATH": "<your MCP_HTTP_ENDPOINT_PATH>",
        "MCP_AUTH_MODE": "<your MCP_AUTH_MODE>",
        "MCP_LOG_LEVEL": "<your MCP_LOG_LEVEL>",
        "MCP_SESSION_MODE": "<your MCP_SESSION_MODE>"
      }
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (per project). Replace each placeholder with your own value before saving.

npm package

{
  "servers": {
    "libofcongress-mcp-server": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/libofcongress-mcp-server",
        "run",
        "start:stdio"
      ],
      "env": {
        "LOC_USER_AGENT": "<your LOC_USER_AGENT>",
        "LOC_REQUEST_DELAY_MS": "<your LOC_REQUEST_DELAY_MS>",
        "MCP_LOG_LEVEL": "<your MCP_LOG_LEVEL>",
        "MCP_SESSION_MODE": "<your MCP_SESSION_MODE>"
      }
    }
  }
}

Save as .vscode/mcp.json in your workspace. Replace each placeholder with your own value before saving.

npm package

{
  "servers": {
    "libofcongress-mcp-server": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/libofcongress-mcp-server",
        "run",
        "start:http"
      ],
      "env": {
        "LOC_USER_AGENT": "<your LOC_USER_AGENT>",
        "LOC_REQUEST_DELAY_MS": "<your LOC_REQUEST_DELAY_MS>",
        "MCP_HTTP_HOST": "<your MCP_HTTP_HOST>",
        "MCP_HTTP_PORT": "<your MCP_HTTP_PORT>",
        "MCP_HTTP_ENDPOINT_PATH": "<your MCP_HTTP_ENDPOINT_PATH>",
        "MCP_AUTH_MODE": "<your MCP_AUTH_MODE>",
        "MCP_LOG_LEVEL": "<your MCP_LOG_LEVEL>",
        "MCP_SESSION_MODE": "<your MCP_SESSION_MODE>"
      }
    }
  }
}

Save as .vscode/mcp.json in your workspace. Replace each placeholder with your own value before saving.

npm package

{
  "mcpServers": {
    "libofcongress-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/libofcongress-mcp-server",
        "run",
        "start:stdio"
      ],
      "env": {
        "LOC_USER_AGENT": "<your LOC_USER_AGENT>",
        "LOC_REQUEST_DELAY_MS": "<your LOC_REQUEST_DELAY_MS>",
        "MCP_LOG_LEVEL": "<your MCP_LOG_LEVEL>",
        "MCP_SESSION_MODE": "<your MCP_SESSION_MODE>"
      }
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json. Replace each placeholder with your own value before saving.

npm package

{
  "mcpServers": {
    "libofcongress-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/libofcongress-mcp-server",
        "run",
        "start:http"
      ],
      "env": {
        "LOC_USER_AGENT": "<your LOC_USER_AGENT>",
        "LOC_REQUEST_DELAY_MS": "<your LOC_REQUEST_DELAY_MS>",
        "MCP_HTTP_HOST": "<your MCP_HTTP_HOST>",
        "MCP_HTTP_PORT": "<your MCP_HTTP_PORT>",
        "MCP_HTTP_ENDPOINT_PATH": "<your MCP_HTTP_ENDPOINT_PATH>",
        "MCP_AUTH_MODE": "<your MCP_AUTH_MODE>",
        "MCP_LOG_LEVEL": "<your MCP_LOG_LEVEL>",
        "MCP_SESSION_MODE": "<your MCP_SESSION_MODE>"
      }
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json. Replace each placeholder with your own value before saving.

npm package

{
  "mcpServers": {
    "libofcongress-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/libofcongress-mcp-server",
        "run",
        "start:stdio"
      ],
      "env": {
        "LOC_USER_AGENT": "<your LOC_USER_AGENT>",
        "LOC_REQUEST_DELAY_MS": "<your LOC_REQUEST_DELAY_MS>",
        "MCP_LOG_LEVEL": "<your MCP_LOG_LEVEL>",
        "MCP_SESSION_MODE": "<your MCP_SESSION_MODE>"
      }
    }
  }
}

Replace each placeholder with your own value before saving.

npm package

{
  "mcpServers": {
    "libofcongress-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/libofcongress-mcp-server",
        "run",
        "start:http"
      ],
      "env": {
        "LOC_USER_AGENT": "<your LOC_USER_AGENT>",
        "LOC_REQUEST_DELAY_MS": "<your LOC_REQUEST_DELAY_MS>",
        "MCP_HTTP_HOST": "<your MCP_HTTP_HOST>",
        "MCP_HTTP_PORT": "<your MCP_HTTP_PORT>",
        "MCP_HTTP_ENDPOINT_PATH": "<your MCP_HTTP_ENDPOINT_PATH>",
        "MCP_AUTH_MODE": "<your MCP_AUTH_MODE>",
        "MCP_LOG_LEVEL": "<your MCP_LOG_LEVEL>",
        "MCP_SESSION_MODE": "<your MCP_SESSION_MODE>"
      }
    }
  }
}

Replace each placeholder with your own value before saving.

BADGE

Show your rank

Maintain this server? Add the live rank badge to your README — it updates automatically as the leaderboard changes.

Markdown

[![MCP Toplist](https://mcptoplist.com/badge/io.github.cyanheads%2Flibofcongress-mcp-server.svg)](https://mcptoplist.com/server/io.github.cyanheads%2Flibofcongress-mcp-server)

HTML

<a href="https://mcptoplist.com/server/io.github.cyanheads%2Flibofcongress-mcp-server"><img src="https://mcptoplist.com/badge/io.github.cyanheads%2Flibofcongress-mcp-server.svg" alt="MCP Toplist: Top 5% of 121,933" /></a>

Variants: append ?metric=score or ?metric=stars to the image URL.

REGISTRIES

Listed on 3 registries

Official MCP

PulseMCP

Glama

ORGANIZATION

cyanheads

Organization

cyanheads

Servers in org

131

Versions across org

2112

Other servers by cyanheads

View all cyanheads servers →

VERSIONS

Available versions (18)

Version	Published
0.2.17	Aug 22, 2026
0.2.16	Jul 16, 2026
0.2.15	Jul 16, 2026
0.2.14	Jul 16, 2026
0.2.13	Jul 16, 2026
0.2.12	Jul 13, 2026
0.2.11	Jul 13, 2026
0.2.10	Jun 20, 2026
0.2.9	Jun 13, 2026
0.2.8	Jun 4, 2026
0.2.7	Jun 2, 2026
0.2.6	May 30, 2026
0.2.5	May 29, 2026
0.2.4	May 26, 2026
0.2.3	May 25, 2026
0.2.2	May 25, 2026
0.2.1	May 24, 2026
0.2.0	May 24, 2026

FAQ

Frequently asked questions

Who maintains @cyanheads/libofcongress-mcp-server?: @cyanheads/libofcongress-mcp-server is maintained by cyanheads, which publishes 131 MCP servers (2112 total versions) tracked on MCP Toplist.
Is @cyanheads/libofcongress-mcp-server listed on the Official MCP Registry?: Yes — @cyanheads/libofcongress-mcp-server is listed on the Official MCP Registry, alongside PulseMCP and Glama.
How many versions does @cyanheads/libofcongress-mcp-server have?: MCP Toplist tracks 18 versions of @cyanheads/libofcongress-mcp-server, most recently published on Aug 22, 2026.
Where can I find the source code for @cyanheads/libofcongress-mcp-server?: The source code for @cyanheads/libofcongress-mcp-server is hosted at github.com/cyanheads/libofcongress-mcp-server.

Used in projects

Do you run this server?

Add to a project

Community projects list the MCP servers behind real agents and apps. Publish yours and this page will link to it.

EXPLORE

All MCP Servers Official MCP Servers GitHub MCP Servers Best MCP Servers Most Active MCP Servers New MCP Servers Best New MCP Servers