poc-spec-loop

poc-spec-loop is a skill for Claude Code, Codex from fabiandistler/agents. It costs 55 tokens per session (2,929 once invoked), scanned A, original, no licence file.

A two-phase process for turning a new proof of concept in R, Python, or Bash into production-ready software. It first creates an agreed specification, then works through each task with test-driven development, where tests are written as part of the implementation loop, up to a pull request.

In plain words
What is it for?
It is for defining a `SPEC.md` and `prd.json`, implementing their tasks, and preparing a pull request.
Why use it?
It prevents an experimental project from moving straight into production without a clear plan and repeated checks.

Skill for Claude CodeCodex

Written for Claude Code and Codex: disable-model-invocation in frontmatter, but also agents/openai.yaml present.

Good fit It is for defining a SPEC.md and prd.json, implementing their tasks, and preparing a pull request.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/fabiandistler/agents/poc-spec-loop
Install

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.

Any agent
npx skills add fabiandistler/agents --skill poc-spec-loop
Clone the repo
git clone --depth 1 https://github.com/fabiandistler/agents

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for poc-spec-loop

README.md
[![agentmods](https://agentmods.dev/badge/skills/fabiandistler/agents/poc-spec-loop/github.svg)](https://agentmods.dev/skills/fabiandistler/agents/poc-spec-loop)
Your own site
<a href="https://agentmods.dev/skills/fabiandistler/agents/poc-spec-loop"><img src="https://agentmods.dev/badge/skills/fabiandistler/agents/poc-spec-loop/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.

agentmods 80×15 button for poc-spec-loop

Your own site · 80×15
<a href="https://agentmods.dev/skills/fabiandistler/agents/poc-spec-loop"><img src="https://agentmods.dev/badge/skills/fabiandistler/agents/poc-spec-loop.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 55 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,929 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00055 $0.02929
Opus 5.5 $0.00022 $0.01172
Sonnet 5.5 $0.00011 $0.00586
Haiku 4.5 $0.00006 $0.00293

Measured 3d ago against content hash 86b548439079, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

poc-spec-loop 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 3d ago.

The scan reads SKILL.md. This mod also ships 2 executable files (assets/loop.sh, scripts/test_loop.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

skills/poc-spec-loop/SKILL.md · 126 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Files

What ships with it

9 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.

Changes

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.

  1. 3d ago Changed 86b548439079
  2. 4d ago Changed · +3 lines c657fb3b2251
  3. 6d ago Changed · -2 lines 46380792d5f0
  4. 8d ago Changed · +4 lines · +4 tokens per session 5d9ea2b25510
  5. 11d ago Changed 4e9f9f91bb42
  6. 17d ago Changed · +3 lines 9a202cf5b134
  7. 1mo ago Changed 63f3a568fbb6
  8. 1mo ago First seen · 118 lines · 51 tokens per session scan A a0c92f797ea9

Subscribe to this mod's changes

poc-spec-loop is a skill published in the GitHub repository fabiandistler/agents (2 stars, last pushed yesterday), with no licence file. It adds 55 tokens to every session and 2,929 once invoked, about $0.0002 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 2026-09-27.

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