Search inside scanned US newspapers and browse the Library of Congress catalogue. No API key.
Connect Runs on your machine
claude mcp add mcp-libraryofcongress -e LOC_USER_AGENT=<LOC_USER_AGENT> -e LOC_MIN_INTERVAL_MS=<LOC_MIN_INTERVAL_MS> -e LOC_TIMEOUT_MS=<LOC_TIMEOUT_MS> -e LOC_NEWSPAPER_TIMEOUT_MS=<LOC_NEWSPAPER_TIMEOUT_MS> -e LOC_LOG_LEVEL=<LOC_LOG_LEVEL> -- npx -y [email protected]{
"mcpServers": {
"mcp-libraryofcongress": {
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"LOC_USER_AGENT": "<LOC_USER_AGENT>",
"LOC_MIN_INTERVAL_MS": "<LOC_MIN_INTERVAL_MS>",
"LOC_TIMEOUT_MS": "<LOC_TIMEOUT_MS>",
"LOC_NEWSPAPER_TIMEOUT_MS": "<LOC_NEWSPAPER_TIMEOUT_MS>",
"LOC_LOG_LEVEL": "<LOC_LOG_LEVEL>"
}
}
}
}{
"mcpServers": {
"mcp-libraryofcongress": {
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"LOC_USER_AGENT": "<LOC_USER_AGENT>",
"LOC_MIN_INTERVAL_MS": "<LOC_MIN_INTERVAL_MS>",
"LOC_TIMEOUT_MS": "<LOC_TIMEOUT_MS>",
"LOC_NEWSPAPER_TIMEOUT_MS": "<LOC_NEWSPAPER_TIMEOUT_MS>",
"LOC_LOG_LEVEL": "<LOC_LOG_LEVEL>"
}
}
}
}{
"servers": {
"mcp-libraryofcongress": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"LOC_USER_AGENT": "<LOC_USER_AGENT>",
"LOC_MIN_INTERVAL_MS": "<LOC_MIN_INTERVAL_MS>",
"LOC_TIMEOUT_MS": "<LOC_TIMEOUT_MS>",
"LOC_NEWSPAPER_TIMEOUT_MS": "<LOC_NEWSPAPER_TIMEOUT_MS>",
"LOC_LOG_LEVEL": "<LOC_LOG_LEVEL>"
}
}
}
}Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.
Tools
This server runs locally, so its tools are listed by your MCP client once it starts.
Environment variables
| Name | Description |
|---|---|
LOC_USER_AGENTOptional | Identify your own client. The project's own identifier is appended, so the Library can always reach a human. |
LOC_MIN_INTERVAL_MSOptional | Minimum milliseconds between requests. Default 6000, floor 3000. |
LOC_TIMEOUT_MSOptional | Deadline for one catalogue, record or collection request, in milliseconds. Default 30000. |
LOC_NEWSPAPER_TIMEOUT_MSOptional | Deadline for one search_newspapers request, in milliseconds. The full-text corpus answers in tens of seconds. Default 90000. |
LOC_LOG_LEVELOptional | silent, error, info or debug. Default error. Logs go to stderr. |
Details
| Package | [email protected] (NPM, stdio) |
| Package | https://github.com/smeet666/mcp-libraryofcongress/releases/download/v3.1.0/[email protected] (MCPB, stdio) |
| First published | 29 Oct 2026 |
| Last updated | 29 Oct 2026 |
| Registry name | io.github.smeet666/mcp-libraryofcongress |
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