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/cofin/flow/copilot-instructionsgit clone --depth 1 https://github.com/cofin/flowWhat 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 | $0.00967 | $0.00967 |
| Opus 5 | $0.00483 | $0.00483 |
| Sonnet 5 | $0.00193 | $0.00193 |
| Haiku 4.5 | $0.00097 | $0.00097 |
Grade C, and why
flow copilot-instructions.md scanned grade C with 1 finding 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.
Hidden instructionshighPrompt injection
Directives inside HTML comments, invisible characters or bidirectional overrides are read by the model and not by the person reviewing the file.
<!-- flow-rule-adapter: {"activation":"Repository instructions, custom agents, and Agent Skills activate Flow.","automatic_push":false,"canonical_sha256":"640298521fd9c87d05b13a69ec34ee52776f8da5277eac730adc795732ffeca7" How it starts
The opening of the file, as written. The whole thing — 46 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Flow Operational Rule
Activation: Repository instructions, custom agents, and Agent Skills activate Flow.
When a repository has .agents/, read its configured root, bundle index, active
spec, authoritative task worksheet, and applicable recursively nested knowledge
before acting. Operational skills resolve only from .agents/skills/.
Route through the flow skill and exactly one lifecycle skill. Refine plans
until every worksheet is executable, follow the selected worksheet without
improvising, and route contradictions through revise/refine. Apply direct Markdown
frontmatter state synchronization and reconcile task-first.
Use structured-choice-v1 for unresolved decisions: one decision at a time,
only through a currently allowed compatible native tool or the equivalent
sequential-text fallback. Run correctness review and then the mandatory fresh
quality review before finish/archive.
Commits remain local unless the user explicitly asks for delivery. Never create, move, force-update, or delete Git tags.
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 First seen · 46 lines · 967 tokens per session scan C 90d57450f1c2
flow copilot-instructions.md is an instructions file published in the GitHub repository cofin/flow (15 stars, last pushed 3d ago), licensed Apache-2.0. It adds 967 tokens to every session, about $0.0048 per session on Opus 5. A static security scan graded it C with 1 finding (hidden instructions). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other instructions, from other repositories
scaffold AGENTS.md
Instructions for zigrivers/scaffold, covering agent instructions, quick reference, scaffold releases and landing the plane (session completion).
foolery CLAUDE.md
Instructions for acartine/foolery, covering agent instructions, codex configuration, repository overrides, git worktree policy (hard override) and worktree dependency bootstrap.
foolery AGENTS.md
Instructions for acartine/foolery, covering agent instructions, codex configuration, repository overrides, git worktree policy (hard override) and worktree dependency bootstrap.
looper_rust AGENTS.md
Instructions for quangdang46/looper_rust, covering looper rust — ai agent guidelines, build, test, lint and workspace members.
bd-explore GEMINI.md
Gemini CLI instructions for halaprix/bd-explore, covering gemini.md - gemini / antigravity guide for bd-explore, context & guidelines, running verification tests and structure.
scaffold CLAUDE.md
Instructions for zigrivers/scaffold, covering claude.md, core principles, project overview, structure and source of truth.