Borrowing it
Nothing to install: this file belongs to contentful/contentful-sdk-core. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/contentful/contentful-sdk-core/master/AGENTS.mdgit clone --depth 1 https://github.com/contentful/contentful-sdk-coreWrote 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/contentful/contentful-sdk-core/agents-md)<a href="https://agentmods.dev/instructions/contentful/contentful-sdk-core/agents-md"><img src="https://agentmods.dev/badge/instructions/contentful/contentful-sdk-core/agents-md/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/instructions/contentful/contentful-sdk-core/agents-md"><img src="https://agentmods.dev/badge/instructions/contentful/contentful-sdk-core/agents-md.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00718 | $0.00718 |
| Opus 5.5 | $0.00287 | $0.00287 |
| Sonnet 5.5 | $0.00144 | $0.00144 |
| Haiku 4.5 | $0.00072 | $0.00072 |
Grade A, and why
contentful-sdk-core AGENTS.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 2mo 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 — 52 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Agent Guide
Read this file first. It tells you where to find context in this repo.
Quick Reference
| What you need | Where to look |
|---|---|
| How this repo is structured | ARCHITECTURE.md |
| How to build/test/run | CONTRIBUTING.md |
| Why decisions were made | docs/ADRs/ |
| What this repo does | README.md |
| PR review rules | .bito/guidelines/ |
| Active specs/work | docs/specs/ |
Sharp Edges & Invariants
- Never import without
.jsextension — all TypeScript source imports must use.jsextensions (e.g.,import foo from './foo.js'). This is required for ESM resolution. - Never modify
httpAgent/httpsAgentduring copy — these objects contain private fields that break on deep clone. ThecopyHttpClientParamsfunction handles this by re-assigning references after copy. - Interceptor order matters — interceptors are attached in a specific sequence (
onBeforeRequest→asyncToken→rateLimitThrottle→rateLimitRetry→onError). Changing the order can cause auth failures or incorrect retry behavior. axiosis not a listed dependency — it's provided by downstream SDKs via thecreateHttpClient(axios, params)factory pattern. Never add it todependencies.- Rate limit retry deletes
httpAgent/httpsAgentfrom retry config — this is an intentional workaround for an axios serialization bug. Do not "fix" this by preserving them. - Auth headers are obscured in errors —
error-handler.tsintentionally truncates tokens to last 5 chars. Never expose full tokens in error output. - Critical path modules —
create-http-client.ts,rate-limit.ts,rate-limit-throttle.ts, andpThrottle.tsexecute on every single API call made by downstream SDKs. Changes here have outsized blast radius — test thoroughly and consider backward compatibility.
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.
- 2mo ago First seen · 52 lines · 718 tokens per session scan A e626e4f8fbd1
contentful-sdk-core AGENTS.md is an instructions file published in the GitHub repository contentful/contentful-sdk-core (24 stars, last pushed today), licensed MIT. It adds 718 tokens to every session, about $0.0029 per session on Opus 5.5. 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.
contentful-sdk-core AGENTS.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| contentful-sdk-core AGENTS.mdcontentful/contentful-sdk-core | Instructions file | 24 | today | MIT | A | 718 | Codex, OpenCode |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 9,719 | GitHub Copilot |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 5,516 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | today | MIT | A | 7,461 | Codex, OpenCode |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | today | MIT | A | 4,680 | Codex, OpenCode |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 3,093 | GitHub Copilot |
| vscode model-prompts.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 2,022 | GitHub Copilot |