A development guide for building applications with Claude, Anthropic's AI model, through the official Anthropic software libraries or web requests. It also covers updating Claude model integrations and adding prompt caching.

Use it to build, debug, optimise, or migrate applications that import the Anthropic software library or call Claude's API.

It provides project-specific guidance for connecting software to Claude and handling model-version changes without relying on unsupported integration patterns.

claude-api — Skill for Claude Code by Zandereins/schliff

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add Zandereins/schliff --skill c2-claude-api

Clone the repo

git clone --depth 1 https://github.com/Zandereins/schliff

Made for: Claude Code.

Or install schliff, the plugin that ships this one along with the rest of its 18 skills, 1 hook.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/zandereins/schliff/c2-claude-api/github.svg)](https://agentmods.dev/skills/zandereins/schliff/c2-claude-api)

Your own site

<a href="https://agentmods.dev/skills/zandereins/schliff/c2-claude-api"><img src="https://agentmods.dev/badge/skills/zandereins/schliff/c2-claude-api/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/zandereins/schliff/c2-claude-api"><img src="https://agentmods.dev/badge/skills/zandereins/schliff/c2-claude-api.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 193 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 7,890 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.

Origin 98% copy Near-identical to another mod in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00193	$0.07890
Opus 5.5	$0.00077	$0.03156
Sonnet 5.5	$0.00039	$0.01578
Haiku 4.5	$0.00019	$0.00789

Measured 2mo ago against content hash 48ac608cbd34, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

claude-api scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

2. **Raw HTTP** (`curl`, `requests`, `fetch`, `httpx`, etc.) — only when the user explicitly asks for cURL/REST/raw HTTP, the project is a shell/cURL project, or the language has no official SDK.

Origin

This is a copy

98% identical to claude-api — 5 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

benchmarks/corpus/v1/phase1-calibration/c2-claude-api.SKILL.md · 325 lines

How it starts

The opening of the file, as written. The whole thing — 325 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Building LLM-Powered Applications with Claude

This skill helps you build LLM-powered applications with Claude. Choose the right surface based on your needs, detect the project language, then read the relevant language-specific documentation.

Before You Start

Scan the target file (or, if no target file, the prompt and project) for non-Anthropic provider markers — import openai, from openai, langchain_openai, OpenAI(, gpt-4, gpt-5, file names like agent-openai.py or *-generic.py, or any explicit instruction to keep the code provider-neutral. If you find any, stop and tell the user that this skill produces Claude/Anthropic SDK code; ask whether they want to switch the file to Claude or want a non-Claude implementation. Do not edit a non-Anthropic file with Anthropic SDK calls.

Output Requirement

When the user asks you to add, modify, or implement a Claude feature, your code must call Claude through one of:

The official Anthropic SDK for the project's language (anthropic, @anthropic-ai/sdk, com.anthropic.*, etc.). This is the default whenever a supported SDK exists for the project.
Raw HTTP (curl, requests, fetch, httpx, etc.) — only when the user explicitly asks for cURL/REST/raw HTTP, the project is a shell/cURL project, or the language has no official SDK.

Never mix the two — don't reach for requests/fetch in a Python or TypeScript project just because it feels lighter. Never fall back to OpenAI-compatible shims.

Never guess SDK usage. Function names, class names, namespaces, method signatures, and import paths must come from explicit documentation — either the {lang}/ files in this skill or the official SDK repositories or documentation links listed in shared/live-sources.md. If the binding you need is not explicitly documented in the skill files, WebFetch the relevant SDK repo from shared/live-sources.md before writing code. Do not infer Ruby/Java/Go/PHP/C# APIs from cURL shapes or from another language's SDK.

Read the full file on GitHub · 325 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 325 lines · 193 tokens per session scan A 48ac608cbd34

Subscribe to this mod's changes

claude-api is a skill published in the GitHub repository Zandereins/schliff (18 stars, last pushed yesterday), licensed MIT. It adds 193 tokens to every session and 7,890 once invoked, about $0.0008 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). It is 98% identical to claude-api, differing in 5 lines, and is treated as a copy.

Backend and APIs Claude Code Data and AI Python autoresearch cli developer-tools linter

claude-api next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
claude-apiZandereins/schliff	Skill	18	yesterday	MIT	A	193	Claude Code
open-sourcebrowser-use/browser-use	Skill	120k	today	MIT	A	137	Claude Code
notebooklmteng-lin/notebooklm-py	Skill	20k	yesterday	MIT	A	79	Claude Code, Codex
groq-inferencesynthetic-sciences/openscience	Skill	4.4k	yesterday	Apache-2.0	A	77	Claude Code, Codex
polyrepo-boundariesxberg-io/xberg	Skill	9.6k	today	MIT	A	13	Claude Code, Codex
dstack-prototypingdstackai/dstack	Skill	2.3k	yesterday	MPL-2.0	A	80	Claude Code, Codex
fastapiericrisco/rsc-harness	Skill	529	4d ago	MIT	A	94	Claude Code, Codex

claude-api