Borrowing it
Nothing to install: this file belongs to yylo-dev/yylo. 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/yylo-dev/yylo/main/.agents/skills/understand-project/SKILL.mdgit clone --depth 1 https://github.com/yylo-dev/yyloWrote 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/yylo-dev/yylo/understand-project)<a href="https://agentmods.dev/skills/yylo-dev/yylo/understand-project"><img src="https://agentmods.dev/badge/skills/yylo-dev/yylo/understand-project.svg" alt="Measured on agentmods" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00023 | $0.00303 |
| Opus 5 | $0.00012 | $0.00151 |
| Sonnet 5 | $0.00005 | $0.00061 |
| Haiku 4.5 | $0.00002 | $0.00030 |
Grade A, and why
understand-project 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.
What it actually says
Understand the project
- Read
AGENTS.md/CLAUDE.md, repository status, relevant source, tests, and existing product documentation in the integration or assigned feature worktree. - Read related Kanban tasks and durable specs through the canonical metadata controller. Do not assume
.juno_task/plan.mdexists and do not materialize controller-private metadata in a product worktree. - Trace only the dependencies and runtime paths needed for the requested goal. Use bounded parallel investigation when independent questions justify it.
- Report current behavior, sources of truth, affected components, risks, unknowns, and the smallest useful validation loop.
- If the user requested planning, hand the findings to
plan-kanban-tasks. If implementation was requested, work only in the task worktree returned byyy task start TASK_ID. - Write a durable spec only when requested or materially useful, and route it to a controller-admitted location. Do not update root instructions with transient status.
Invocation contract
The structured views below intentionally alias parts of the complete request; they are not additional user arguments.
Main task
$1
Constraints and context
$2
Complete raw request
$ARGUMENTS
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 · 32 lines · 23 tokens per session scan A ced6c100ddd1
understand-project is a skill published in the GitHub repository yylo-dev/yylo (57 stars, last pushed 4d ago), licensed MIT. It adds 23 tokens to every session and 303 once invoked, about $0.0001 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.
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