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Documentation Index

Fetch the complete documentation index at: https://docs.asteragents.com/llms.txt

Use this file to discover all available pages before exploring further.

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What it does

The Call API tool lets your agents make HTTP requests to any API endpoint. Perfect for integrating with third-party services, fetching data from APIs, or sending data to external systems.

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Key features

  • Support for all HTTP methods (GET, POST, PUT, PATCH, DELETE, etc.)
  • Send custom headers (Authorization, Content-Type, etc.)
  • Send request bodies and query parameters
  • Automatic JSON response parsing
  • Built-in error handling for failed requests

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Parameters

ParameterTypeRequiredDescription
endpoint_urlstringYesThe URL of the API endpoint to call
request_typestringYesHTTP method (GET, POST, PUT, PATCH, DELETE)
headersobjectNoHTTP headers to include (e.g. Authorization, Content-Type)
bodyobjectNoRequest body for POST/PUT/PATCH, or query parameters for GET

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Common use cases

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Fetch data from a REST API

endpoint_url: "https://api.example.com/users"
request_type: "GET"
headers: {
  "Authorization": "Bearer your-token"
}
Get data from external APIs for analysis or processing.

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Send data to an API

endpoint_url: "https://api.example.com/users"
request_type: "POST"
headers: {
  "Authorization": "Bearer your-token",
  "Content-Type": "application/json"
}
body: {
  "name": "John Doe",
  "email": "john@example.com"
}
Create or update records in external systems.

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Update existing data

endpoint_url: "https://api.example.com/users/123"
request_type: "PUT"
headers: {
  "Authorization": "Bearer your-token",
  "Content-Type": "application/json"
}
body: {
  "status": "active"
}
Modify existing records through API calls.

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Delete resources

endpoint_url: "https://api.example.com/users/123"
request_type: "DELETE"
headers: {
  "Authorization": "Bearer your-token"
}
Remove data from external systems.

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Security best practices

  • Store API keys and tokens securely, not in plain text
  • Use HTTPS endpoints whenever possible
  • Validate API responses before processing
  • Implement proper error handling for failed requests
  • Be mindful of rate limits on external APIs

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Troubleshooting

“Connection failed” or “Timeout”
  • Check that the API endpoint URL is correct and accessible
  • Verify network connectivity
  • Confirm the API service is running
“Authentication failed” or “401 Unauthorized”
  • Verify your API key or token is correct
  • Check that authentication headers are properly formatted
  • Ensure your API credentials haven’t expired
“Invalid request” or “400 Bad Request”
  • Validate your request parameters and body format
  • Check the API documentation for required fields
  • Ensure Content-Type headers match your data format
“Rate limit exceeded” or “429 Too Many Requests”
  • Reduce the frequency of API calls
  • Implement delays between requests
  • Check the API’s rate limiting documentation