spec-develop

Guidance for implementing the tasks listed in an OpenSpec tasks.md file, a checklist that breaks a software change into coding steps. It also uses the related design and proposal documents and marks completed tasks as work progresses.

In plain words
What is it for?
Use it when applying an OpenSpec implementation checklist, making the required code changes, updating task checkboxes, and running the project's validation commands.
Why use it?
It provides an ordered implementation process tied to the agreed requirements and architecture.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/komluk/scaffolding/spec-develop
Any agent
npx skills add komluk/scaffolding --skill spec-develop
Clone the repo
git clone --depth 1 https://github.com/komluk/scaffolding

Made for: Claude Code, Codex.

Per session 49 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 858 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original 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 $0.00049 $0.00858
Opus 5 $0.00024 $0.00429
Sonnet 5 $0.00010 $0.00172
Haiku 4.5 $0.00005 $0.00086

Measured 2d ago against content hash f9e6f56ec861, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

spec-develop 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 2d 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.

skills/spec-develop/SKILL.md · 106 lines

How it starts

The opening of the file, as written. The whole thing — 106 lines — stays where its author put it; the contents beside it link to each section on GitHub.

OpenSpec Apply (Task Execution)

Guide for implementing code changes driven by tasks.md.

Input Files

File Purpose Action
{specs_path}/tasks.md Implementation checklist Read, execute, mark done
{specs_path}/design.md Architecture decisions Reference during implementation
{specs_path}/proposal.md Context and motivation Reference if unclear on intent

Path Enforcement: The specs_path MUST be .scaffolding/conversations/{UUID}/specs/ where {UUID} is a valid UUID (format: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx). NEVER use descriptive folder names.

Execution Protocol

Step 1: Read tasks.md

Parse all task groups and checkboxes. Identify dependency order.

Step 2: Execute tasks in order

For each task (- [ ] N.M description):

  1. Read the task description and target file path
  2. Check design.md for relevant requirements and decisions
  3. Implement the change following project patterns
  4. Mark complete: change - [ ] to - [x]

Step 3: Run validation after each group

Stack Validation Command
Backend pytest
Frontend npm run validate
Both Run both commands

Step 4: Handle blockers

If a task cannot be completed:

- [ ] 2.3 Implement caching layer
  > BLOCKED: Redis connection config not yet available. Depends on devops setup.

Continue with unblocked tasks. Do not stop the entire chain.

Rules

Rule Detail
Execute in order Respect dependency sequence
Mark progress - [ ] -> - [x] as you complete
Reference design Check design.md before implementing
Never modify specs Only modify tasks.md checkboxes, never change spec content
Validate per group Run tests after each task group
Note blockers Add > BLOCKED: note, skip and continue
Search before write Check core/utils/, core/exceptions.py before creating helpers

Progress Tracking

Read the full file on GitHub · 106 lines

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. 2d ago First seen · 106 lines · 49 tokens per session scan A f9e6f56ec861

Subscribe to this mod's changes

spec-develop is a skill published in the GitHub repository komluk/scaffolding (15 stars, last pushed 26d ago), licensed MIT. It adds 49 tokens to every session and 858 once invoked, about $0.0002 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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