1. Click on "Deploy Server". 2. Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state. 3. In the chat, type @ followed by the MCP server name and your instructions, e.g., "@veto find the orders API and show me how to fetch an order by id" That's it! The server will respond to your query, and you can continue using it as needed. Here is a step-by-step guide with screenshots.

veto

Official

by aiveto

Overview Schema Source Related Servers Discussions Admin

Hybrid

Your entire API platform. Just 3 MCP tools.

Your APIs are already built.

Point veto at your OpenAPI specs. An agent gets three tools: search, describe, and invoke. You name how the APIs connect. A delete waits until a person approves it.

No API rewrites. The agent does not get a tool for every endpoint.

See it yourself: Run the Harbor demo. Mara's order, the customer and invoice links, and a delete that waits.

100 endpoints. 1,000 endpoints. Still 3 MCP tools.

search → describe → invoke

Search. Find the right API using natural language.
Describe. Discover its schema and what to call next.
Invoke. Execute it with built-in controls.

Your API catalog grows. Your agent's tool surface stays the same.

Related MCP server: MCP Toolshed

Your APIs are connected. Your agents should know that.

Ask: "Who placed order 123?"

orders.get → customerId 7 → customers.get

Veto uses declared relationships to guide the next API call. No guessed endpoints. No invented relationships. No loading the entire API catalog into context.

Agents can act. You stay in control.

Ask: "Delete order 123."

Veto holds the operation until a human approves the exact caller, operation, and parameters. When approval is required, the operation cannot proceed without it.

One OpenAPI catalog. Multiple ways to use it.

Want to...	Veto gives you
Connect an agent	Search, describe, and invoke
Use your terminal	`veto search`, `veto describe`, `veto invoke`
Write a script	`veto serve --json`
Call it from Go	One generated client for this runtime, shared by every API
Follow a link to another service	Search in plain language, then the links you wrote
Stop a sensitive call	A person approves the exact caller, operation, and parameters
See what ran	A record of what ran, with secrets left out

One catalog. One runtime. Consistent behavior across interfaces. Module github.com/aiveto/veto.

Get started

Already have OpenAPI specs? You're three commands away from your first MCP server.

brew install aiveto/veto/veto

veto init orders.yaml customers.yaml
veto serve --stdio

The setup guide has the block for Claude, Cursor, or ChatGPT.

See Veto in action

Harbor is a working example: orders, customers, billing, the links between them, and a delete that waits. make demo runs it over the CLI, then over MCP.

No model API key for the local example in this repo: go run ./examples/two-apis.

You already have the APIs. Give your agents a better way to use them.

Get started · Try the demo · Explore the source

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