refactor: introduce model-agnostic agent interfaces#323
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tiann merged 3 commits intotiann:mainfrom Mar 20, 2026
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…D_TYPE Encapsulates the 'codex' literal used in network payloads into a shared constant.
…AD_TYPE Replaces communication payload literals with the shared constant for better maintainability.
Internal identifier cleanup for better developer experience.
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Overview
As HAPI expands its support for multiple AI models, this PR introduces a model-agnostic abstraction layer for agent communication. The goal is to improve code consistency and developer experience (DX) while keeping the existing communication schema intact for compatibility.
Key Changes
AGENT_MESSAGE_PAYLOAD_TYPE. This decouples the internal code from the specific wire format while keeping data packets identical to the current version.sendCodexMessagetosendAgentMessagewithin the CLI package to accurately reflect their role as a common interface for all supported agents.Rationale & Future Vision
This refactoring is a preparatory step for future protocol evolution. By centralizing the payload identifier, we create a Single Source of Truth (SSOT) that will simplify any eventual transition to a model-neutral identifier (e.g., a dedicated HAPI message schema) without scouring the entire codebase for hardcoded strings.