Search Google's Knowledge Graph for structured information about real-world entities
Search Google's Knowledge Graph for structured information about real-world entities. Exposed over MCP by the google mcp server, that capability becomes something an assistant can invoke while it works, not something you go and do afterwards.
Model Context Protocol server that connects Claude (or any MCP client) to Google's free public Knowledge Graph API. Search for real-world entities - people, places, organisations, concepts - and get structured data back.
Everything the assistant can do here goes through one of these:
search_knowledge_graph — The search_knowledge_graph tool exposed by this serverlookup_knowledge_graph_entities — The lookup_knowledge_graph_entities tool exposed by this serverInstallation goes through your MCP client rather than a global install: point it at @houtini/google-knowledge-graph-mcp on npm and it is fetched when the client starts. The copy-paste blocks for Claude Desktop, Claude Code and Cursor are further down this page.
You will need one environment variable: GOOGLE_KNOWLEDGE_GRAPH_API_KEY. The server will not start without them, which is usually why the tools fail to appear on a first run. Keep credentials in your client's env block or a secrets manager rather than in a file you might commit.
Among the knowledge and memory options, the useful question is rarely "what can it do" but "what does it cost you to run" — permissions, credentials, and how much of your context its toolset consumes. Google's toolset — search_knowledge_graph, lookup_knowledge_graph_entities — is a fair guide to whether it matches your workflow. It is maintained by houtini-ai; worth a glance at recent repository activity before you build anything load-bearing on it.
This entry was verified against Google's own documentation before publication; SyncDev keeps the directory reviewed rather than auto-generated.
| Tool | What it does |
|---|---|
| search_knowledge_graph | The search_knowledge_graph tool exposed by this server. |
| lookup_knowledge_graph_entities | The lookup_knowledge_graph_entities tool exposed by this server. |
{
"mcpServers": {
"google-knowledge-graph": {
"command": "npx",
"args": ["-y", "@houtini/google-knowledge-graph-mcp"],
"env": {
"GOOGLE_KNOWLEDGE_GRAPH_API_KEY": "your-api-key-here"
}
}
}
}Configuration as documented by the project. Restart the client after saving.
| Variable | Description | Required |
|---|---|---|
| GOOGLE_KNOWLEDGE_GRAPH_API_KEY | Credential the server authenticates with. | Yes |
A knowledge graph your assistant keeps between sessions — entities, relations and observations that persist.
Kill hallucinated APIs — version-accurate, up-to-date library documentation injected straight into context.
Your workspace, on speaking terms with AI — search, read and write Notion pages and databases.
A structured scratchpad for hard problems — stepwise reasoning with revisions, branches and visible logic.
Symbol-level code navigation, refactoring and memory for coding agents — the IDE brain your assistant has been missing.
Chat with your second brain — search, read and write vault notes through the Local REST API.