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 skills add ericrisco/rsc-harness --skill ftdgit clone --depth 1 https://github.com/ericrisco/rsc-harnessWrote 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/ericrisco/rsc-harness/ftd)<a href="https://agentmods.dev/skills/ericrisco/rsc-harness/ftd"><img src="https://agentmods.dev/badge/skills/ericrisco/rsc-harness/ftd/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/ericrisco/rsc-harness/ftd"><img src="https://agentmods.dev/badge/skills/ericrisco/rsc-harness/ftd.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 | $0.00108 | $0.01590 |
| Opus 5.5 | $0.00043 | $0.00636 |
| Sonnet 5.5 | $0.00022 | $0.00318 |
| Haiku 4.5 | $0.00011 | $0.00159 |
Grade A, and why
ftd 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 12d 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 — 111 lines — stays where its author put it; the contents beside it link to each section on GitHub.
FTD — Fast-Track Development
The lane ordinary work takes. Not a lighter methodology: the same discipline about evidence with none of the coordination the ten-phase chain exists to buy. One document instead of five, written because the work might be interrupted, not because somebody has to approve it first.
You are here because the decisor in ../suggest/SKILL.md ruled that this turn authorises a change
and did not select ../sdd/SKILL.md. If it is still a question, you are in the wrong place: go back
and answer it.
Why this lane exists
The constitution's seventh principle has said it from the start: «la fricción es proporcional al riesgo. Silencio para lo trivial, ceremonia solo donde el fallo es caro. Un sistema que molesta en el 80% inofensivo acaba apagado, y apagado no protege el 20% que importa.»
The harness spent a long time contradicting it — every request that sounded like building went through ten phases. This lane is that principle finally implemented, not a new idea.
The feature document
One per feature, in the workspace wiki under 02-DOCS/wiki/ftd/<slug>.md. Never inside the code
repository: whoever clones it should get code, not somebody else's notes in progress.
It is written before the first change, not after, and it holds exactly this:
---
author: <who asked for it — git user.name>
branch: <the branch the work runs on>
status: in-progress
---
# <feature>
## Intent — what changes, and why it is worth doing
## Scope — what is in, and what is explicitly not
## Checklist — one line per task, each with what would prove it done
## Evidence — the observed output per completed task
## Next — the single next step, so an interruption costs nothing
The frontmatter says whose work it is, so «¿qué ha hecho cada uno?» has an answer. You never close
it by hand: when the branch lands on the default branch, rsc's post-merge hook sets status: done
and replaces Next with where and when it merged (on a closed default branch, via rsc/knowledge).
What ships with it
2 files 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.
- 12d ago Changed · +9 lines a26c53d3b9f0
- 13d ago Changed · +5 lines · +3 tokens per session 1104ecd5f307
- 15d ago Changed · +6 lines 9bbb4fcbc4f9
- 16d ago Changed · -3 lines f9c0a6ec1a1f
- 1mo ago First seen · 94 lines · 105 tokens per session scan A 7ae21ce2110c
ftd is a skill published in the GitHub repository ericrisco/rsc-harness (231 stars, last pushed today), licensed MIT. It adds 108 tokens to every session and 1,590 once invoked, about $0.0004 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 2026-09-18.
Other skills, from other repositories
create-issue
Draft and submit a GitHub issue from a user idea or bug description, with bilingual body and correct labels.
requirements-writer
Use when converting PM intake into a slice SPEC.md with observable acceptance outcomes, explicit scope, and advisory sibling build dependencies.
pm
Use when the user wants product requirements rather than code: 'write a PRD', 'product requirements', 'spec this feature for the team', 'ooo pm'. Runs a PM-focused interview with automatic question classification and produces a PRD/PM document. Not for implementation requests.
backlog-capture
Quickly capture product ideas, feature requests, or insights from meetings and conversations. Rapid documentation with smart categorization and deduplication.
publish
Publish Seed specification as GitHub Issues for team-based project management.
queue-handoff
Use when ending a turn, finishing a slice, blocked on another agent's work, or escalating to a human — durable work handoff via queue items so the system keeps moving across compactions, missed messages, and interruptions. Covers the hot-potato terminal-turn-rule (active work ends by passing the ball, not by going…