anthropic-sdk-typescript is a TypeScript and JavaScript library for calling the Claude API from server-side applications and supported runtimes. It is used by developers building software that sends requests to Anthropic's language models.
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 instructions/anthropics/anthropic-sdk-typescript/claude-mdgit clone --depth 1 https://github.com/anthropics/anthropic-sdk-typescriptWrote 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/instructions/anthropics/anthropic-sdk-typescript/claude-md)<a href="https://agentmods.dev/instructions/anthropics/anthropic-sdk-typescript/claude-md"><img src="https://agentmods.dev/badge/instructions/anthropics/anthropic-sdk-typescript/claude-md.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 | $0.00244 | $0.00244 |
| Opus 5 | $0.00122 | $0.00122 |
| Sonnet 5 | $0.00049 | $0.00049 |
| Haiku 4.5 | $0.00024 | $0.00024 |
Grade A, and why
anthropic-sdk-typescript CLAUDE.md 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.
What it actually says
Node-only code
Bundlers follow every statically-resolvable import — including lazy import('./relative/path') — and fail browser builds on node: builtins in the resulting chunks.
- Code referencing Node builtins must live in a module named
node.ts(or anode/directory). Everything else insrc/must be runtime-agnostic. - Strongly preferred: Node-only modules are imported by the user and passed into the SDK. SDK-internal code must not import them, statically or dynamically.
- If an internal reference is unavoidable, shim the module via the package.json
browserfield: a<name>.browser.tswith an identical export surface where every value export throws<exportName> requires Node.js or a Node-compatible runtime. Add runtime and type-level parity tests, and keep the internal import lazy. - Never hide imports from bundlers (
webpackIgnorecomments, variable specifiers,eval). Never referenceprocessat module scope in statically-reachable code without atypeof process(orglobalThis.process?.) guard. import typeof Node builtins is fine anywhere — types are erased.
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 · 10 lines · 244 tokens per session scan A bf92f764928a
anthropic-sdk-typescript CLAUDE.md is an instructions file published in the GitHub repository anthropics/anthropic-sdk-typescript (2,106 stars, last pushed yesterday), licensed MIT. It adds 244 tokens to every session, about $0.0012 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.
Other instructions, from other repositories
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Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.
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AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, applying the notice (cutover) and fallback chain (never fail the build).