claude-api

Name: claude-api
Author: jackspace

15stars7forks

How to install claude-api?

jackspace/claudeskillz/claude-api

$npx -y skills add jackspace/ClaudeSkillz --skill claude-api

Installs into the current project.

Summary

This skill provides comprehensive knowledge for working with the Anthropic Messages API (Claude API). It should be used when integrating Claude models into applications, implementing streaming responses, enabling prompt caching for cost savings, adding tool use (function calling)

Files · 1

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SKILL.md

1	# Claude API (Anthropic Messages API)
2
3	Status: Production Ready
4	Last Updated: 2025-10-25
5	Dependencies: None (standalone API skill)
6	Latest Versions: @anthropic-ai/sdk@0.67.0
7
8	---
9
10	## Quick Start (5 Minutes)
11
12	### 1. Get API Key
13
14	```bash
15	# Sign up at https://console.anthropic.com/
16	# Navigate to API Keys section
17	# Create new key and save securely
18	export ANTHROPIC_API_KEY="sk-ant-..."
19	```
20
21	Why this matters:
22	- API key required for all requests
23	- Keep secure (never commit to git)
24	- Use environment variables
25
26	### 2. Install SDK (Node.js)
27
28	```bash
29	npm install @anthropic-ai/sdk
30	```
31
32	```typescript
33	import Anthropic from '@anthropic-ai/sdk';
34
35	const anthropic = new Anthropic({
36	apiKey: process.env.ANTHROPIC_API_KEY,
37	});
38
39	const message = await anthropic.messages.create({
40	model: 'claude-sonnet-4-5-20250929',
41	max_tokens: 1024,
42	messages: [{ role: 'user', content: 'Hello, Claude!' }],
43	});
44
45	console.log(message.content[0].text);
46	```
47
48	CRITICAL:
49	- Always use server-side (never expose API key in client code)
50	- Set `max_tokens` (required parameter)
51	- Model names are versioned (use latest stable)
52
53	### 3. Or Use Direct API (Cloudflare Workers)
54
55	```typescript
56	// No SDK needed - use fetch()
57	const response = await fetch('https://api.anthropic.com/v1/messages', {
58	method: 'POST',
59	headers: {
60	'x-api-key': env.ANTHROPIC_API_KEY,
61	'anthropic-version': '2023-06-01',
62	'content-type': 'application/json',
63	},
64	body: JSON.stringify({
65	model: 'claude-sonnet-4-5-20250929',
66	max_tokens: 1024,
67	messages: [{ role: 'user', content: 'Hello!' }],
68	}),
69	});
70
71	const data = await response.json();
72	```
73
74	---
75
76	## The Complete Claude API Reference
77
78	## Table of Contents
79
80	1. [Core API](#core-api-messages-api)
81	2. [Streaming Responses](#streaming-responses-sse)
82	3. [Prompt Caching](#prompt-caching--90-cost-savings)
83	4. [Tool Use (Function Calling)](#tool-use-function-calling)
84	5. [Vision (Image Understanding)](#vision-image-understanding)
85	6. [Extended Thinking Mode](#extended-thinking-mode)
86	7. [Rate Limits](#rate-limits)
87	8. [Error Handling](#error-handling)
88	9. [Platform Integrations](#platform-integrations)
89	10. [Known Issues](#known-issues-prevention)
90
91	---
92
93	## Core API (Messages API)
94
95	### Available Models (October 2025)
96
97	\| Model \| ID \| Context \| Best For \| Cost (per MTok) \|
98	\|-------\|-----\|---------\|----------\|-----------------\|
99	\| Claude Sonnet 4.5 \| claude-sonnet-4-5-20250929 \| 200k tokens \| Balanced performance \| $3/$15 (in/out) \|
100	\| Claude 3.7 Sonnet \| claude-3-7-sonnet-20250228 \| 2M tokens \| Extended thinking \| $3/$15 \|
101	\| Claude Opus 4 \| claude-opus-4-20250514 \| 200k tokens \| Highest capability \| $15/$75 \|
102	\| Claude 3.5 Haiku \| claude-3-5-haiku-20241022 \| 200k tokens \| Fast, cost-effective \| $1/$5 \|
103
104	### Basic Message Creation
105
106	```typescript
107	import Anthropic from '@anthropic-ai/sdk';
108
109	const anthropic = new Anthropic({
110	apiKey: process.env.ANTHROPIC_API_KEY,
111	});
112
113	const message = await anthropic.messages.create({
114	model: 'claude-sonnet-4-5-20250929',
115	max_tokens: 1024,
116	messages: [
117	{ role: 'user', content: 'Explain quantum computing in simple terms' }
118	],
119	});
120
121	console.log(message.content[0].text);
122	```
123
124	### Multi-Turn Conversations
125
126	```typescript
127	const messages = [
128	{ role: 'user', content: 'What is the capital of France?' },
129	{ role: 'assistant', content: 'The capital of France is Paris.' },
130	{ role: 'user', content: 'What is its population?' },
131	];
132
133	const message = await anthropic.messages.create({
134	model: 'claude-sonnet-4-5-20250929',
135	max_tokens: 1024,
136	messages,
137	});
138	```
139
140	### System Prompts
141
142	```typescript
143	const message = await anthropic.messages.create({
144	model: 'claude-sonnet-4-5-20250929',
145	max_tokens: 1024,
146	system: 'You are a helpful Python coding assistant. Always provide type hints and docstrings.',
147	messages: [
148	{ role: 'user', content: 'Write a function to sort a list' }
149	],
150	});
151	```
152
153	CRITICAL:
154	- System prompt MUST come before messages array
155	- System prompt sets behavior for entire conversation
156	- Can be 1-10k tokens (affects context window)
157
158	---
159
160	## Streaming Responses (SSE)
161
162	### Using

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claude-api

15stars7forks

View on GitHub

How to install claude-api?

jackspace/claudeskillz/claude-api

$npx -y skills add jackspace/ClaudeSkillz --skill claude-api

Installs into the current project.

Summary

Files · 1

View on GitHub

SKILL.md

1	# Claude API (Anthropic Messages API)
2
3	Status: Production Ready
4	Last Updated: 2025-10-25
5	Dependencies: None (standalone API skill)
6	Latest Versions: @anthropic-ai/sdk@0.67.0
7
8	---
9
10	## Quick Start (5 Minutes)
11
12	### 1. Get API Key
13
14	```bash
15	# Sign up at https://console.anthropic.com/
16	# Navigate to API Keys section
17	# Create new key and save securely
18	export ANTHROPIC_API_KEY="sk-ant-..."
19	```
20
21	Why this matters:
22	- API key required for all requests
23	- Keep secure (never commit to git)
24	- Use environment variables
25
26	### 2. Install SDK (Node.js)
27
28	```bash
29	npm install @anthropic-ai/sdk
30	```
31
32	```typescript
33	import Anthropic from '@anthropic-ai/sdk';
34
35	const anthropic = new Anthropic({
36	apiKey: process.env.ANTHROPIC_API_KEY,
37	});
38
39	const message = await anthropic.messages.create({
40	model: 'claude-sonnet-4-5-20250929',
41	max_tokens: 1024,
42	messages: [{ role: 'user', content: 'Hello, Claude!' }],
43	});
44
45	console.log(message.content[0].text);
46	```
47
48	CRITICAL:
49	- Always use server-side (never expose API key in client code)
50	- Set `max_tokens` (required parameter)
51	- Model names are versioned (use latest stable)
52
53	### 3. Or Use Direct API (Cloudflare Workers)
54
55	```typescript
56	// No SDK needed - use fetch()
57	const response = await fetch('https://api.anthropic.com/v1/messages', {
58	method: 'POST',
59	headers: {
60	'x-api-key': env.ANTHROPIC_API_KEY,
61	'anthropic-version': '2023-06-01',
62	'content-type': 'application/json',
63	},
64	body: JSON.stringify({
65	model: 'claude-sonnet-4-5-20250929',
66	max_tokens: 1024,
67	messages: [{ role: 'user', content: 'Hello!' }],
68	}),
69	});
70
71	const data = await response.json();
72	```
73
74	---
75
76	## The Complete Claude API Reference
77
78	## Table of Contents
79
80	1. [Core API](#core-api-messages-api)
81	2. [Streaming Responses](#streaming-responses-sse)
82	3. [Prompt Caching](#prompt-caching--90-cost-savings)
83	4. [Tool Use (Function Calling)](#tool-use-function-calling)
84	5. [Vision (Image Understanding)](#vision-image-understanding)
85	6. [Extended Thinking Mode](#extended-thinking-mode)
86	7. [Rate Limits](#rate-limits)
87	8. [Error Handling](#error-handling)
88	9. [Platform Integrations](#platform-integrations)
89	10. [Known Issues](#known-issues-prevention)
90
91	---
92
93	## Core API (Messages API)
94
95	### Available Models (October 2025)
96
97	\| Model \| ID \| Context \| Best For \| Cost (per MTok) \|
98	\|-------\|-----\|---------\|----------\|-----------------\|
99	\| Claude Sonnet 4.5 \| claude-sonnet-4-5-20250929 \| 200k tokens \| Balanced performance \| $3/$15 (in/out) \|
100	\| Claude 3.7 Sonnet \| claude-3-7-sonnet-20250228 \| 2M tokens \| Extended thinking \| $3/$15 \|
101	\| Claude Opus 4 \| claude-opus-4-20250514 \| 200k tokens \| Highest capability \| $15/$75 \|
102	\| Claude 3.5 Haiku \| claude-3-5-haiku-20241022 \| 200k tokens \| Fast, cost-effective \| $1/$5 \|
103
104	### Basic Message Creation
105
106	```typescript
107	import Anthropic from '@anthropic-ai/sdk';
108
109	const anthropic = new Anthropic({
110	apiKey: process.env.ANTHROPIC_API_KEY,
111	});
112
113	const message = await anthropic.messages.create({
114	model: 'claude-sonnet-4-5-20250929',
115	max_tokens: 1024,
116	messages: [
117	{ role: 'user', content: 'Explain quantum computing in simple terms' }
118	],
119	});
120
121	console.log(message.content[0].text);
122	```
123
124	### Multi-Turn Conversations
125
126	```typescript
127	const messages = [
128	{ role: 'user', content: 'What is the capital of France?' },
129	{ role: 'assistant', content: 'The capital of France is Paris.' },
130	{ role: 'user', content: 'What is its population?' },
131	];
132
133	const message = await anthropic.messages.create({
134	model: 'claude-sonnet-4-5-20250929',
135	max_tokens: 1024,
136	messages,
137	});
138	```
139
140	### System Prompts
141
142	```typescript
143	const message = await anthropic.messages.create({
144	model: 'claude-sonnet-4-5-20250929',
145	max_tokens: 1024,
146	system: 'You are a helpful Python coding assistant. Always provide type hints and docstrings.',
147	messages: [
148	{ role: 'user', content: 'Write a function to sort a list' }
149	],
150	});
151	```
152
153	CRITICAL:
154	- System prompt MUST come before messages array
155	- System prompt sets behavior for entire conversation
156	- Can be 1-10k tokens (affects context window)
157
158	---
159
160	## Streaming Responses (SSE)
161
162	### Using

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