write-tech-spec

A skill that writes a technical specification—a reviewed plan for building a change—before code is written. It saves the document as specs/<id>/TECH.md.

In plain words
What is it for?
Use it when someone requests a spec, technical design, or implementation plan, or when a change spans several modules or involves an architectural decision.
Why use it?
It turns a large or risky coding task into a concrete plan grounded in the existing codebase, reducing the chance of rework.

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/qinghaoliqaq/autocoder/write_tech_spec
Any agent
npx skills add qinghaoliqaq/AutoCoder --skill write_tech_spec
Clone the repo
git clone --depth 1 https://github.com/qinghaoliqaq/AutoCoder

Made for: Claude Code, Codex.

Per session 61 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,148 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 $0.00061 $0.01148
Opus 5 $0.00030 $0.00574
Sonnet 5 $0.00012 $0.00230
Haiku 4.5 $0.00006 $0.00115

Measured 2d ago against content hash bbbebd5aea07, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

write-tech-spec 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.

src-tauri/src/bundled_skills/write_tech_spec/SKILL.md · 140 lines

How it starts

The opening of the file, as written. The whole thing — 140 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Write Tech Spec

This skill produces a technical specification grounded in the current codebase, not a wish-list. The output is a markdown file at specs/<id>/TECH.md that the team (or your future self) can review, critique, and then hand back to an agent for implementation.

When To Use

Use this skill when:

  • The user explicitly asks for a spec / tech spec / design doc
  • The task touches more than two modules and requires a plan before diving in
  • A naive implementation would risk breaking other parts of the codebase
  • You're about to make a non-trivial architectural decision and want it written down before you commit

Do not use this for trivial fixes (one-line changes, typos, single- function refactors). Spec-writing has a fixed cost; spend it where it actually saves rework.

Spec Directory Layout

specs/<id>/
  TECH.md           ← this skill writes this
  PRODUCT.md        ← optional; product-level "what & why"
  PROJECT_LOG.md    ← optional; running log for multi-day work
  DECISIONS.md      ← optional; ADR-style decision records

<id> is one of:

  • a GitHub issue id like gh-1063
  • a ticket id like APP-3076
  • a short kebab-case slug like parallel-subtask-merge

Pick one and use it consistently. If unsure, ask the user (via AskUserQuestion) or default to a slug derived from the task title.

TECH.md Required Sections

Every TECH.md must have these sections, in this order, with these exact H2 headings:

# <Title>

## Context
## Current State
## Proposed Changes
## End-to-End Flow
## Implementation Plan
## Testing
## Risks & Open Questions

Section guidance

  • Context (3–6 bullets) — Why are we doing this? What's the user- facing motivation? Link to the relevant PRODUCT.md or issue if one exists.

  • Current State — Summarize how the codebase handles the relevant area today. Every claim must be cited with a file:line reference. Use Read / Grep to verify before citing. If you cite a file you didn't read, you've failed this skill.

Read the full file on GitHub · 140 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 · 140 lines · 61 tokens per session scan A bbbebd5aea07

Subscribe to this mod's changes

write-tech-spec is a skill published in the GitHub repository qinghaoliqaq/AutoCoder (11 stars, last pushed 4mo ago), licensed Apache-2.0. It adds 61 tokens to every session and 1,148 once invoked, about $0.0003 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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