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 rp1-run/rp1 --skill build-fastgit clone --depth 1 https://github.com/rp1-run/rp1Wrote 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/rp1-run/rp1/build-fast)<a href="https://agentmods.dev/skills/rp1-run/rp1/build-fast"><img src="https://agentmods.dev/badge/skills/rp1-run/rp1/build-fast/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/rp1-run/rp1/build-fast"><img src="https://agentmods.dev/badge/skills/rp1-run/rp1/build-fast.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 | $0.00020 | $0.03117 |
| Opus 5.5 | $0.00008 | $0.01247 |
| Sonnet 5.5 | $0.00004 | $0.00623 |
| Haiku 4.5 | $0.00002 | $0.00312 |
Grade A, and why
build-fast 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 1mo 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 — 321 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Build Fast Command
Quick-iteration workflow for focused changes. Three-phase execution: plan -> build -> [review].
§CTX
Use the pre-resolved projectRoot, kbRoot, workRoot, and codeRoot values from the generated Workflow Bootstrap section. Do not hardcode .rp1/work/ or .rp1/context/ paths.
References
| File | Purpose | When to Load |
|---|---|---|
references/review-and-finalization.md |
Optional review pass, cleanup manifest, comment cleanup, push, post-implementation checkpoint | Once the build phase completes |
§VERSION-GATE
If RP1_VERSION < 0.3.3 then STOP execution with message:
Your rp1 CLI needs to be updated.
Please run `/rp1-base:self-update` to update, then retry this command.
Or in the terminal: `rp1 update`
§FLAG-LOGIC
When AFK=true, treat CONFIRM_PLAN as false regardless of the value passed. AFK means zero user interaction, so every user prompt in this workflow is skipped — an AFK run that pauses for input has nobody to answer it.
When AFK=false, the plan review checkpoint is mandatory after planner artifact registration and before §PHASE-2. CONFIRM_PLAN does not control the plan checkpoint; it only enables the post-implementation checkpoint in §4.4.
Effective values when AFK=true:
- Plan review checkpoint -> SKIP
CONFIRM_PLAN->false(forced, disables post-implementation checkpoint)- All checkpoints -> SKIP (no user prompts)
STATE-MACHINE
stateDiagram-v2
[*] --> plan
plan --> build : plan_ready
build --> review : build_complete
review --> [*] : done
On each phase transition, report via:
rp1 agent-tools emit \
--workflow build-fast \
--type status_change \
--run-id {RUN_ID} \
--name "{RUN_NAME}" \
--step {CURRENT_STATE} \
--data '{"status": "running"}'
RUN_IDcomes from the generated Workflow Bootstrap section- Derive
RUN_NAMEfrom the development request: a brief summary (max 60 chars) prefixed with"Feature: "(e.g.,"Feature: Add logout button to navbar")
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.
- 1mo ago First seen · 321 lines · 20 tokens per session scan A 9116249e45d9
build-fast is a skill published in the GitHub repository rp1-run/rp1 (38 stars, last pushed today), licensed Apache-2.0. It adds 20 tokens to every session and 3,117 once invoked, about $0.0001 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 2026-09-07.
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prd-to-plan
Turn a PRD into a multi-phase implementation plan using tracer-bullet vertical slices, saved as a local Markdown file in ./plans/. Use when user wants to break down a PRD, create an implementation plan, plan phases from a PRD, or mentions "tracer bullets".