StackyapperOpenAPI to MCP: give AI access to your business API
In Stackyapper, an administrator can select a supported OpenAPI listing or upload, paste, or link an OpenAPI definition to create a private app. Stackyapper checks which operations it supports. Add credentials, verify the connection, and grant the required tools before an AI client can use them.
What does OpenAPI to MCP mean?
OpenAPI describes an HTTP API. An MCP interface lets compatible AI clients discover and request tools built from supported API operations. Importing a definition does not create the underlying API, make an unreachable service reachable, or grant users access to its tools.
What do you need before importing?
- An owner or administrator in the correct Stackyapper workspace.
- An OpenAPI definition for the API you are authorized to connect.
- A supported authentication method and a credential limited to the intended company or account.
- An API endpoint reachable from the hosted service. A private app is workspace-specific; it does not imply private-network connectivity.
- One small read operation and a known record for your first test.
Use a definition without embedded secret values or real customer examples. Enter credentials only in the connection configuration, separately from the schema.
How do you connect an OpenAPI definition in Stackyapper?
- Confirm the workspace. Open Apps for the company whose API you intend to connect.
- Choose the definition. Select a supported OpenAPI listing, or upload, paste, or link your own definition.
- Review compatibility. Check the supported operations and authentication requirements. Incompatible operations stay inactive; do not assume the whole API became available.
- Configure the connection. Supply the requested provider credential and verify that the connection succeeds.
- Grant narrow access. Allow a test user or group to use only the read tools required for the first question.
- Connect an AI client. Follow the client-specific MCP setup guide. ChatGPT uses
https://mcp.stackyapper.dev; compatible Streamable HTTP clients usehttps://mcp.stackyapper.dev/mcp. - Test and review. Retrieve a known record, compare it with the source system, and check the tool’s outcome in Audit before expanding access.
What is a useful first test?
Using Stackyapper, find the approved read tool for our test app. Retrieve only test record TEST-001. Return its ID and status, identify any missing fields, and do not create, update, or delete anything.
Use a synthetic record that exists in your own test environment. The prompt guides the assistant; the read-only grant is what restricts access. Audit records the tool and outcome without storing its request details or returned data, so compare the answer with the source system separately.
Why might an imported API show no usable tools?
Check these separately: whether the operation passed compatibility checks, whether the endpoint and authentication work, and whether the signed-in user has the tool grant in the selected workspace. A successful import does not establish a healthy connection; a healthy connection does not establish permission. See the first-app guide for that distinction.
What are the limits?
This guide covers OpenAPI imports. Other listing formats in the directory do not establish compatibility with this import path. Support depends on the schema, operation, API, and authentication method. Provider API limits still apply, and write tools need their own permissions and any required confirmation. Private-app import does not change a catalog app’s Available or Beta status.