Google’s Developer Knowledge API and its associated Model Context Protocol (MCP) server give developers and AI tools a machine-readable way to search and retrieve Google’s official developer documentation. Google announced them in public preview on February 4, 2026. The current MCP reference lists three tools—search, grounded answering, and document retrieval—but the service’s individual availability tier is not established by the platform-wide MCP release notes.
What Google announced
In its February 4, 2026 announcement, Google described the Developer Knowledge API and MCP server as a machine-readable gateway to official Google developer documentation. The API is designed to search documentation programmatically and retrieve pages as Markdown. The launch post named Firebase, Android, Google Cloud, and additional documentation sources as part of the service’s coverage.
Google’s announcement said that, during the public preview, documentation would be re-indexed within 24 hours after an update. That is a statement from the launch announcement about the preview, not a verified current service-level commitment. The announcement’s author, Google Technical Writer Jess Kuras, called the tools “a canonical, machine-readable gateway to Google’s official developer documentation.” Read Google’s launch announcement.
What the MCP server can do
The current Google for Developers MCP reference lists the global endpoint as https://developerknowledge.googleapis.com/mcp and documents three tools. Their roles differ: search returns candidate material, retrieval supplies full documents, and the answer tool synthesizes a response with references.
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| Tool | What it does | When to use it |
|---|---|---|
search_documents |
Finds documentation and returns text chunks, document names, and URLs. | Start here to locate relevant pages or discover document names. |
get_documents |
Retrieves a document, or up to 20 documents, using document names. | Use it when search snippets are not enough and you need the full source material. |
answer_query |
Generates an answer grounded in the same documentation corpus and returns references. | Use it when you want a synthesized response with supporting documentation references. |
The reference’s coverage list includes ADK, Android, Apigee, Chrome, Dart, Firebase, Flutter, Fuchsia, Gemini CLI, Go, Google AI, Google Antigravity, Google Cloud, Google Developers/Ads/Search/Maps/YouTube, Google Home, Google Maps Platform, TensorFlow, and Web. This is the set of areas listed in the current MCP reference; it should not be read as a guarantee that every Google product or every document is included.
Choose the interface that fits your workflow
- Use the API when your application needs direct, programmatic search and Markdown retrieval and you want to manage the retrieval and answer-generation flow yourself.
- Use MCP when an MCP-compatible assistant or coding agent should call Google’s documented tools through its client configuration.
- Search before retrieving when you need to find relevant documents. If snippets do not contain enough detail, pass the returned document names to
get_documents. - Use grounded answering when a synthesized response with references suits the task. For workflows requiring a specific answer format or additional reasoning, retrieve the source documents and let your client handle synthesis.
These are functional distinctions, not a ranking: the better fit depends on the documentation corpus you need and the interfaces and authentication your application or client supports.
Setup requires current instructions
The launch post described creating and restricting an API key in a Google Cloud project, installing the Google Cloud CLI, enabling the server with a beta command, and configuring the relevant client settings file. The current MCP reference says that servers must be enabled and authentication set up before use. Because these instructions can change, follow the current reference and your client’s current setup guidance rather than assuming the February launch command applies to every project or region.
The command published at launch was:
gcloud beta services mcp enable developerknowledge.googleapis.com --project=PROJECT_IDTreat it as the command from the February 2026 launch instructions, not as a universal current procedure. Check the current Developer Knowledge MCP reference for the latest enablement and authentication steps before configuring a project.
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Do not infer this service’s tier from platform-wide MCP changes
Google Cloud’s MCP release notes say that Google and Google Cloud remote MCP servers became generally available on May 1, 2026, while also warning that individual MCP servers may be in Preview or GA. The notes record support for MCP protocol version 2026-07-28 on September 14, 2026. Those are platform-level updates; they do not establish whether the Developer Knowledge service itself is currently Preview or GA. Check the Google Cloud MCP release notes and the supported-products information for an individual service’s status.
What Google said was still planned
At launch, Google described the preview as focused on high-quality, unstructured Markdown. Its announcement presented structured content—including code sample objects and API reference entities—broader corpus coverage, and reduced re-indexing latency as future plans. Those statements describe the roadmap announced at launch; they are not confirmation that those capabilities have since shipped.
Rank #4
Examples of the questions the tools target
Google’s announcement offered these illustrative prompts:
- “What is the best way to implement push notifications in Firebase?”
- “Can you check the docs to find out how to fix the ApiNotActivatedMapError in the Maps API?”
- “Compare Google Cloud Run and Cloud Functions for this specific use case.”
They show the kinds of documentation tasks the tools are meant to support; they are examples published by Google, not evidence of measured user search behavior.
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