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.
npx agentmods add skills/fortiumpartners/ensemble/using-anthropic-platformnpx skills add FortiumPartners/ensemble --skill using-anthropic-platformgit clone --depth 1 https://github.com/FortiumPartners/ensembleWrote 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.
[](https://agentmods.dev/skills/fortiumpartners/ensemble/using-anthropic-platform)<a href="https://agentmods.dev/skills/fortiumpartners/ensemble/using-anthropic-platform"><img src="https://agentmods.dev/badge/skills/fortiumpartners/ensemble/using-anthropic-platform.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00024 | $0.02439 |
| Opus 5 | $0.00012 | $0.01220 |
| Sonnet 5 | $0.00005 | $0.00488 |
| Haiku 4.5 | $0.00002 | $0.00244 |
Grade A, and why
using-anthropic-platform scanned grade A with 0 findings 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 6d 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 378 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Anthropic Claude SDK - Quick Reference
When to Use
Load this skill when:
anthropicpackage inrequirements.txtorpyproject.toml@anthropic-ai/sdkinpackage.jsondependenciesANTHROPIC_API_KEYenvironment variable present- User mentions "Anthropic", "Claude", or Claude models
For detailed patterns: See REFERENCE.md
Table of Contents
- Claude Models
- Quick Start
- Messages API Essentials
- Streaming
- Tool Use (Function Calling)
- Extended Thinking
- Vision
- Prompt Caching
- Error Handling
- Platform Features
- Further Reading
Claude Models (January 2026)
| Model | Context | Max Output | Thinking | Best For |
|---|---|---|---|---|
claude-opus-4-5-20251101 |
200K | 32K | Yes | Maximum intelligence |
claude-sonnet-4-20250514 |
200K | 64K | Yes | Complex reasoning, coding |
claude-3-5-sonnet-20241022 |
200K | 8K | No | Standard tasks |
claude-3-5-haiku-20241022 |
200K | 8K | No | Simple chat, Q&A (cheapest) |
Model Selection
Simple chat/Q&A -> claude-3-5-haiku (cheapest)
Standard tasks -> claude-3-5-sonnet
Complex reasoning/coding -> claude-sonnet-4 or claude-opus-4-5
Extended thinking needed -> claude-sonnet-4 or claude-opus-4-5
Batch processing -> Any model (50% cost savings)
Pricing (per 1M tokens)
| Model | Input | Output | Cache Read |
|---|---|---|---|
| claude-opus-4-5 | $15.00 | $75.00 | $1.50 |
| claude-sonnet-4 | $3.00 | $15.00 | $0.30 |
| claude-3-5-sonnet | $3.00 | $15.00 | $0.30 |
| claude-3-5-haiku | $0.80 | $4.00 | $0.08 |
Quick Start
Python
from anthropic import Anthropic
client = Anthropic() # Uses ANTHROPIC_API_KEY env var
message = client.messages.create(
model="claude-sonnet-4-20250514",
max_tokens=1024,
messages=[{"role": "user", "content": "Hello, Claude!"}]
)
print(message.content[0].text)
What ships with it
14 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- examples/basic-chat.example.py 6.4 KB runs code
- examples/README.md 3.1 KB
- examples/streaming.example.py 8.0 KB runs code
- examples/tool-use.example.py 10 KB runs code
- examples/vision.example.py 11 KB runs code
- README.md 7.6 KB
- REFERENCE.md 26 KB
- templates/extended-thinking.template.py 9.5 KB runs code
- templates/messages.template.py 4.2 KB runs code
- templates/messages.template.ts 3.8 KB runs code
- templates/README.md 5.5 KB
- templates/streaming.template.py 7.0 KB runs code
- templates/tool-use.template.py 14 KB runs code
- VALIDATION.md 8.0 KB
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.
- 6d ago First seen · 378 lines · 24 tokens per session scan A 36c1d5a5ecc7
using-anthropic-platform is a skill published in the GitHub repository FortiumPartners/ensemble (11 stars, last pushed 1mo ago), licensed MIT. It adds 24 tokens to every session and 2,439 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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