Borrowing it
Nothing to install: this file belongs to tincopper/neeko. 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/tincopper/neeko/main/.agents/skills/trellis-before-dev/SKILL.mdgit clone --depth 1 https://github.com/tincopper/neekoWrote 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/tincopper/neeko/trellis-before-dev)<a href="https://agentmods.dev/skills/tincopper/neeko/trellis-before-dev"><img src="https://agentmods.dev/badge/skills/tincopper/neeko/trellis-before-dev/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/skills/tincopper/neeko/trellis-before-dev"><img src="https://agentmods.dev/badge/skills/tincopper/neeko/trellis-before-dev.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 | $0.00070 | $0.00592 |
| Opus 5.5 | $0.00028 | $0.00237 |
| Sonnet 5.5 | $0.00014 | $0.00118 |
| Haiku 4.5 | $0.00007 | $0.00059 |
Grade A, and why
trellis-before-dev 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 5d 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.
This is a copy
97% identical to trellis-before-dev — 13 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
What it actually says
Read the relevant development guidelines before starting your task.
Execute these steps:
-
Read current task artifacts:
prd.mdfor requirements and acceptance criteriadesign.mdif present for technical designimplement.mdif present for execution order and validation plan
-
Discover packages and their spec layers:
python3 ./.trellis/scripts/get_context.py --mode packages -
Identify which specs apply to your task based on:
- Which package you're modifying (e.g.,
cli/,docs-site/) - What type of work (backend, frontend, unit-test, docs, etc.)
- Any spec/research paths referenced by the task artifacts
- Which package you're modifying (e.g.,
-
Read the spec index for each relevant module:
cat .trellis/spec/<package>/<layer>/index.mdFollow the "Pre-Development Checklist" section in the index.
-
Read the specific guideline files listed in the Pre-Development Checklist that are relevant to your task. The index is NOT the goal — it points you to the actual guideline files (e.g.,
error-handling.md,conventions.md,mock-strategies.md). Read those files to understand the coding standards and patterns. -
Always read shared guides:
cat .trellis/spec/guides/index.md -
For a non-trivial task, state the change boundary before writing code. Non-trivial means it touches more than one file, crosses a layer, changes a public interface, or edits code you did not just write. Write down:
- the smallest behavior gap between what happens now and what should happen
- where that behavior actually lives (not where it is easiest to intercept)
- which files you expect to change, and why each one is necessary
- what you are explicitly not doing in this task
- if a local refactor is needed, how you will show it did not change behavior
A small, well-scoped change does not need this — do it directly.
If the real scope turns out to be clearly larger than this, say so and why before continuing. Do not widen the change on your own.
-
Understand the coding standards and patterns you need to follow, then proceed with your development plan.
This step is mandatory before writing any code.
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 5d ago Changed · +5 lines 00c9d1c83bc3
- 1mo ago First seen · 47 lines · 70 tokens per session scan A 611ea728352b
trellis-before-dev is a skill published in the GitHub repository tincopper/neeko (12 stars, last pushed yesterday), licensed Apache-2.0. It adds 70 tokens to every session and 592 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 97% identical to trellis-before-dev, differing in 13 lines, and is treated as a copy.
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