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Each one is an expert for a single field. It answers from real source material, shows you where every answer came from, and says so when it can't. A source on every answer, or it's free. It plugs into your agent as a tool.
Examiner procedure from the USPTO's own manual, 8 core chapters. Every answer shows the exact MPEP passage it came from.
$0.10 / cited answer PREMIUM
$0.00 / refusal
Applied AI engineering from AI Engineer conference talks: agents, evals, retrieval, production LLM systems. Every answer shows its source.
$0.02 / cited answer
$0.00 / refusal
Startup guidance from YC partner talks and founder lectures: fundraising, product-market fit, growth. Every answer shows its source.
$0.02 / cited answer
$0.00 / refusal
Planned source: IRS publications (public record)
Get notified →Planned source: USCIS policy manual (public record)
Get notified →Planned source: FAA regulations (public record)
Get notified →Planned source: SEC rules & guidance (public record)
Get notified →Planned source: OSHA standards (public record)
Get notified →Planned source: EPA regulations (public record)
Get notified →WHAT IS AN EXPERT PACK?
An expert pack gives your AI agent the knowledge of someone who has spent years in one field. Your agent consults it before it answers, so you get a real domain expert's answer with the exact source attached. Not a confident guess.
Your agent asks a question it has to get right.
The pack looks for the answer in the field's real source material, and only answers when the source clearly backs it up.
It answers with the source attached, or it says it doesn't know. No source, no answer, and a "don't know" costs nothing.
Your agent works from what someone in the field actually knows, so you stop getting confident filler on the questions that matter.
Each one shows the exact source it came from, so you can verify it in seconds instead of taking it on faith.
When the source can't back an answer, the pack says so instead of making something up. That answer is always free.
HOW IT WORKS
DEX is short for domain experts. Here is what happens when your agent needs one.
ENDPOINT FORMAT · YOURS IS ISSUED WITH YOUR BETA KEY
https://mcp.dexforagents.com/{your-pack}
Your agent queries the pack over MCP, mid-task, like any other tool call.
Every answer returns with a citation and chunk key to the primary source. If the sources can't back an answer, the pack refuses and refusals cost nothing.
MCP is the one-line way agents plug into tools. Claude Code, and most agent frameworks, already speak it.
Endpoints are issued per beta batch. There is no public URL yet.
Get a beta keyWHERE YOUR QUERIES GO
Your agent's queries go to the pack server, which retrieves from the corpus and generates the answer through Anthropic's API. We log queries, retrieved chunks, and answers to debug retrieval and run evals. We don't use your data to train models and we don't sell or share it.
TESTED CLIENT
Works with Claude Code. MCP is an open protocol; other clients are untested until we say otherwise. Beta batches are onboarded by hand, so bring the client you actually use.
Come with a question your agent keeps getting wrong.
Join the beta