Overview
Phinite’s Custom API predefined tool lets workspace assistants call Custom API APIs through DevStudio after you save a connection under Integrations → Predefined tools. Connect any REST API with configurable auth, headers, and retries,Predefined tools require a saved connection before they appear in Graph Studio’s tool picker. See Predefined Tools in GraphStudio.
What this integration enables
- Automate workflows using this predefined tool from agent graphs
- Connect once under Integrations and reuse across assistants
- Enable individual subtools per agent in Graph Studio
Required credentials
- See integration configuration fields in Phinite
Setup steps
- Identify the REST API base URL and authentication method (basic auth, API key, or headers).
- Prepare username/password, API key, and any custom headers your API requires.
- Log into your Phinite workspace at app.phinite.ai
- Navigate to Integrations → Predefined tools
- Select Custom API
- Click + Add Configuration
- Enter the credential fields listed above
- Select assistants that should use this connection
- Click Save Configuration
Configure in Graph Studio
- Open an agent in Graph Studio
- Select the agent node → Tools tab → Add a new tool
- Choose CustomApiTools (or search for Custom API)
- Select your saved connection or add a new one
- Enable the subtools your workflow needs and save
Predefined tools
Phinite provides 1 subtool for Custom API:- Make Request: Make an HTTP request to any API endpoint
Documentation & resources
- Official documentation:
https://developer.mozilla.org/en-US/docs/Web/HTTP - Phinite documentation: Custom API
Notes
- Store API keys and tokens securely; many providers show secrets only once
- Use separate connections for Dev, UAT, and Prod environments where possible
- Test with a minimal subtool call after saving credentials