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 acaprino/daodan --skill agent-sdk-buildergit clone --depth 1 https://github.com/acaprino/daodanWrote 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/acaprino/daodan/agent-sdk-builder)<a href="https://agentmods.dev/skills/acaprino/daodan/agent-sdk-builder"><img src="https://agentmods.dev/badge/skills/acaprino/daodan/agent-sdk-builder.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 | $0.00099 | $0.02155 |
| Opus 5 | $0.00049 | $0.01077 |
| Sonnet 5 | $0.00020 | $0.00431 |
| Haiku 4.5 | $0.00010 | $0.00215 |
Grade A, and why
agent-sdk-builder 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 8d 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 — 153 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Claude Agent SDK
Build applications that run the Claude Code agent loop programmatically: agents that read files, write code, run commands, search the web, and delegate to subagents from inside your own program.
Key distinction: the Agent SDK (claude-agent-sdk) runs the full agent loop with built-in
tools. The Anthropic Client SDK (anthropic) makes raw API calls. Use the Agent SDK when you want
an autonomous tool-using agent, not a chat completion.
| TypeScript | Python | |
|---|---|---|
| Package | @anthropic-ai/claude-agent-sdk |
claude-agent-sdk |
| Install | npm install @anthropic-ai/claude-agent-sdk |
pip install claude-agent-sdk |
| Auth | ANTHROPIC_API_KEY env var |
ANTHROPIC_API_KEY env var |
| Entry point | query() |
query() |
| Source | anthropics/claude-agent-sdk-typescript |
anthropics/claude-agent-sdk-python |
The CLI package @anthropic-ai/claude-code ships inside the SDK. No separate install.
Source of truth
This SDK changes faster than any bundled document. Option shapes, tool names, defaults, and whole
features move between releases: fork_session changed type, plugins changed from paths to config
objects, and the TypeScript V2 preview was removed outright. Treat this skill's knowledge as
orientation, never as the authority.
Three tiers. Stop at the first one that answers the question:
- The project's installed SDK. TypeScript: the type definitions under
node_modules/@anthropic-ai/claude-agent-sdk/and the version in itspackage.json. Python: the installed package undersite-packages/claude_agent_sdk/, orinspect.signature()on the symbol. This tier wins over everything else, because it is what the user's code will run against. - Current official documentation, https://code.claude.com/docs/en/agent-sdk/. Use it when nothing is installed yet, or when the question is about behavior rather than a signature.
- The references in this skill. Worked examples and orientation. Never the last word on a signature, an option shape, a default, or whether a feature still exists.
What ships with it
5 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.
- 8d ago First seen · 153 lines · 99 tokens per session scan A 83add86c98d9
agent-sdk-builder is a skill published in the GitHub repository acaprino/daodan (8 stars, last pushed today), licensed MIT. It adds 99 tokens to every session and 2,155 once invoked, about $0.0005 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 2026-08-31.
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