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 skills add ashish7802/awesome-api-skills --skill anthropicgit clone --depth 1 https://github.com/ashish7802/awesome-api-skillsWrote 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/ashish7802/awesome-api-skills/anthropic)<a href="https://agentmods.dev/skills/ashish7802/awesome-api-skills/anthropic"><img src="https://agentmods.dev/badge/skills/ashish7802/awesome-api-skills/anthropic/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.
<a href="https://agentmods.dev/skills/ashish7802/awesome-api-skills/anthropic"><img src="https://agentmods.dev/badge/skills/ashish7802/awesome-api-skills/anthropic.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00000 | $0.00543 |
| Opus 5 | $0.00000 | $0.00271 |
| Sonnet 5 | $0.00000 | $0.00109 |
| Haiku 4.5 | $0.00000 | $0.00054 |
Grade A, and why
anthropic 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 10d 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 — 61 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Anthropic API Skill
Overview
Anthropic's API provides access to the Claude 3 family (Opus, Sonnet, Haiku). This skill focuses on the Messages API, vision capabilities, and strict system prompt isolation.
Installation
npm install @anthropic-ai/sdk
pip install anthropic
Authentication
Use the x-api-key header with your ANTHROPIC_API_KEY. You must also supply the anthropic-version header (e.g., 2023-06-01).
Core Concepts
- System Prompt: Isolated from the main conversation array for higher adherence.
- Claude 3.5 Sonnet: The recommended default model for speed and coding intelligence.
- Max Tokens: Required parameter defining the generation limit (e.g., 4096 or 8192).
Common Workflows
- Define the system prompt.
- Pass the conversation history alternating precisely between
userandassistant. - Process the response blocks.
Error Handling
Handle AnthropicError. The OverloadedError indicates capacity constraints; retry with backoff. AuthenticationError indicates invalid or revoked keys.
Security
Anthropic provides inherent safety filters. Ensure system prompts instruct the model to avoid executing unverified external data.
Rate Limits
Tiered rate limits applied per minute (RPM) and tokens per minute (TPM). Tier 1 for Claude 3 Sonnet is 50 RPM and 40,000 TPM.
Best Practices
Always put long reference documents inside <documents> XML tags. Claude is specifically trained to parse and pay closer attention to XML structures.
Troubleshooting
If the API returns a 'roles must alternate' error, ensure your messages array strictly follows a user -> assistant -> user sequence without duplicate consecutive roles.
References
Why use this skill
Use this when your agent works with anthropic — structured patterns beat pasted docs and prevent common hallucinations.
AI pitfalls
- Using deprecated model IDs or wrong API endpoints
- Confusing chat vs completions vs embeddings APIs
- Omitting rate-limit and token budget handling
What ships with it
8 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.
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.
- 10d ago First seen · 61 lines · 0 tokens per session scan A 4f8680f2abee
anthropic is a skill published in the GitHub repository ashish7802/awesome-api-skills (13 stars, last pushed today), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 543 tokens. 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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