Borrowing it
Nothing to install: this file belongs to chriswu727/sibyl. 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/chriswu727/sibyl/main/AGENTS.mdgit clone --depth 1 https://github.com/chriswu727/sibylWrote 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/chriswu727/sibyl/agents-md)<a href="https://agentmods.dev/instructions/chriswu727/sibyl/agents-md"><img src="https://agentmods.dev/badge/instructions/chriswu727/sibyl/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/chriswu727/sibyl/agents-md"><img src="https://agentmods.dev/badge/instructions/chriswu727/sibyl/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 | $0.02354 | $0.02354 |
| Opus 5.5 | $0.00942 | $0.00942 |
| Sonnet 5.5 | $0.00471 | $0.00471 |
| Haiku 4.5 | $0.00235 | $0.00235 |
Grade A, and why
sibyl 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 2d 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 — 182 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Sibyl — Agent Guide
Sibyl is a local deep-research MCP tool for AI agents. It maintains bounded public-web investigations, evidence-linked conclusions, and explicit gaps. Human-readable reports are optional outputs of the same research state.
Installation and interface
This checkout is an unreleased host-only source preview. Development paused on
2026-10-28 after the paired host evaluation did not pass, and no stable release
is planned. Published 0.4.0b1 and 0.3.0
still contain the old architecture. Use Python 3.11+ and a fresh environment
with python -m pip install -e .. sibyl-mcp exposes eight tools with compact
MCP structuredContent, mirrored as JSON text. The former keyless compatibility
profile was removed; --profile keyless now exits with an error.
See README.md and docs/agent-protocol.md.
Sibyl never calls a generative model or reads subscription credentials. Reasoning
and any model usage stay in the calling host under its own terms and limits.
Search keys are optional; Tavily can incur separate charges. Markdown/JSON reports
need no extra; [report] is PDF rendering only, with Pillow >=13.0.0.
Read research_plan.questions[].review for host-authored conclusions and stable
support/challenge links. Inspect gaps before reuse. Use
get_research(passage_ids=[...]) for exact evidence: briefs omit raw text.
Use view="sources" with the current revision to page the full catalog, and
view="full" for the compatible snapshot. Each brief is self-contained.
continue_research and assess_research return a view="update" for one
question: new sources with top passages inline (cut ones marked truncated),
retrieval notes, that question's gaps and checks, readiness, next searches and
before_answering steps; after an assessment, answer_material lists the
recorded claims with URLs, counterevidence status and open gaps for the answer.
Before answering, read at least two independent publishers and one
counterevidence source; cite URLs, never Sibyl claim or passage IDs.
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.
- 2d ago Changed · +13 lines · +212 tokens per session 0c65e4d334f2
- 3d ago Changed · +35 lines · +561 tokens per session 0c7fd8282b32
- 8d ago Changed · +16 lines · +245 tokens per session 8faeeeaed371
- 9d ago Changed · -20 lines · -55 tokens per session e3f1dedb06b5
- 2mo ago First seen · 138 lines · 1,391 tokens per session scan A e88bdb2ee874
sibyl AGENTS.md is an instructions file published in the GitHub repository chriswu727/sibyl (2 stars, last pushed 2d ago), licensed MIT. It adds 2,354 tokens to every session, about $0.0094 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 2026-08-31.
Other instructions, from other repositories
vscode buildNext.instructions.md
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).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
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 copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deno copilot-instructions.md
Copilot instructions for denoland/deno, covering deno development guide for github copilot, network access, high level overview, key directories and key files to understand first.