Expired50% confidenceFactExact time
The Claude API uses the /v1/messages endpoint, treating the system prompt as a top-level field separate from the conversation messages.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
7/2/2026
First Seen
Valid until: 9/30/2026(expired)
Sources
Complete Guide to Connecting Third-Party APIs in Claude Code Desktop
bilibili烟神殿殿主6/5/2026
Related Claims
UnverifiedClaude Code expects Anthropic-style API endpoints such as /v1/messages76% similarUnverifiedWith each request, Claude Code packages five layers of content and sends them to the API: the system prompt, tool definitions, CLAUDE.md, conversation history, and the current input.69% similarUnverifiedClaude Code V2.1.224 is the foundational capability for cross-session messaging, supporting session communication within the same machine.68% similarUnverifiedIn user messages sent to the agent, Claude Code injects the claude.md file together with a System Reminder that includes instructions allowing Claude to ignore content not highly relevant to the current task.68% similarUnverifiedClaude Code runs directly in the user's terminal environment rather than a conversational interface.68% similar
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