Claude API HelperVerified Creator

• references/
• SKILL.mdopen
• README.mdopen

name:

Claude API Helper

slug:

claude-api-helper

version:

v2.7.0

license:

MIT

author:

@anthropic-labs

categories:

Backend

tags:

#claude-api#anthropic-sdk#prompt-caching#tool-use#streaming

description:

Build production-grade Claude API apps with prompt caching, tool use, streaming, and model migration baked in.

// What you can do with it

• Prompt caching — enforces the prefix-match invariant: stable content first (tools → system → messages), cachecontrol: {type: "ephemeral"} on the last shared block, volatile content (timestamps, UUIDs)
• Tool use — client.beta.messages.toolRunner with betaZodTool (TS) or @betatool (Python) for the automatic loop, or a manual loop that appends full response.content and handles stopreason: "pauseturn".
• Streaming — .stream() with .getFinalMessage() / .getfinalmessage(), the contentblockdelta event taxonomy, and a default of max_tokens ~64000 for streamed requests (~16000 non-streaming to dodge HTTP t
• Model migration — confirms scope first, classifies each file (caller vs. registry vs. opaque string), then applies the per-version breaking-change checklist: budgettokens → thinking: {type: "adaptive"