Tips for developing custom actions in ChatGPT

Custom Actions allow ChatGPT to invoke direct HTTP endpoints and differ from the standardized Model Context Protocol, requiring an intermediary such as MintMCP to connect MCP servers with ChatGPT’s Custom Actions interface. Effective action design must account for ChatGPT’s 45-second call limit by handling longer tasks asynchronously with job identifiers and explicit instructions for users to request updates, since ChatGPT does not automatically poll. Responses should be paginated when potentially large, with clear page metadata and download links for binary files, to remain within output limits. Tool descriptions should be concise, action-oriented, and use familiar user language, while argument names and descriptions should reflect common conversational terms and map internal codes on the backend. Actions should also return structured, actionable error messages that identify invalid inputs, provide debugging details for system failures, and indicate when retries are appropriate. MintMCP is presented as a service that handles protocol translation, authentication, and schema mapping between MCP servers and ChatGPT-compatible Custom Actions.

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