Implementation guide · Updated August 13, 2026
Turn OpenAPI operations into reviewable MCP tools.
OpenAPI gives you paths, parameters, and schemas. An agent tool also needs a stable name, an unambiguous description, safe inputs, and an honest risk boundary. This guide shows the conversion step without pretending the generated contract is a hosted MCP server.
Before: the OpenAPI operation
Start with the contract you already maintain.
A useful operation has a unique operationId, a description that says what changes, typed parameters, and documented failure responses. Never send production secrets with the specification.
{
"paths": {
"/customers/{customerId}": {
"patch": {
"operationId": "updateCustomer",
"summary": "Update customer metadata",
"parameters": [
{ "name": "customerId", "in": "path", "required": true,
"schema": { "type": "string" } }
]
}
}
}
}After: a portable tool contract
Make the action legible to both the model and the reviewer.
{
"name": "update_customer",
"description": "Update customer metadata Use this to update non-payment customer profile fields after the user has confirmed the change.",
"inputSchema": {
"type": "object",
"additionalProperties": false,
"properties": {
"path": {
"type": "object",
"additionalProperties": false,
"properties": { "customerId": { "type": "string", "description": "path parameter customerId" } },
"required": ["customerId"]
},
"body": {
"type": "object",
"properties": {
"email": { "type": "string", "format": "email" },
"name": { "type": "string" }
},
"additionalProperties": false
}
},
"required": ["path", "body"]
},
"annotations": {
"title": "Update customer metadata",
"readOnlyHint": false,
"destructiveHint": false,
"idempotentHint": false,
"openWorldHint": true
},
"metadata": {
"method": "PATCH",
"path": "/customers/{customerId}",
"risk": "sensitive_write",
"requiresConfirmation": true,
"operationId": "updateCustomer",
"tags": []
}
}Alinafe emits portable MCP-compatible descriptors and function-tool schemas. You still own authentication, authorization, execution, retries, audit logs, and the MCP runtime itself.
Review checklist
Five checks before an agent can call the operation.
Name
Give every operation a stable, unique ID that describes one action.
Inputs
Mark required values, constraints, and identifiers explicitly.
Effects
Say whether the action reads, writes, charges, deletes, or sends data.
Approval
Require confirmation for sensitive or destructive changes.
Runtime
Enforce auth, idempotency, timeouts, and logging in your execution layer.
Next step
Check your own sanitized OpenAPI document.
Use the API for a repeatable readiness report, or request the $249 founding review for a human second pass.