ad-architecture

A repository documentation tool that creates or audits ARCHITECTURE.md, a file describing a codebase's structure, boundaries, and operational patterns.

In plain words
What is it for?
Use it to document layers, entry points, data access, configuration, logging, monitoring, tracing, deployment, and accepted architecture decisions.
Why use it?
It turns the existing code and deployment setup into a checked architecture reference and highlights drift when the file already exists.

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/corridortech/posecap/ad-architecture
Any agent
npx skills add CorridorTech/PoseCap --skill ad-architecture
Clone the repo
git clone --depth 1 https://github.com/CorridorTech/PoseCap

Made for: Claude Code, Codex.

Per session 81 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,205 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 $0.00081 $0.01205
Opus 5 $0.00041 $0.00602
Sonnet 5 $0.00016 $0.00241
Haiku 4.5 $0.00008 $0.00120

Measured 3d ago against content hash 730fb2dd62a8, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

ad-architecture 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.

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.

.agents/skills/ad-architecture/SKILL.md · 96 lines

How it starts

The opening of the file, as written. The whole thing — 96 lines — stays where its author put it; the contents beside it link to each section on GitHub.

<background_information> Produces ARCHITECTURE.md at the repo root. Pairs with ADRs in doc/adr/ — architecture is the binding pattern; ADRs are individual decisions with status.

Two modes detected from filesystem state:

  • ARCHITECTURE.md exists at the repo root → audit (do not rewrite, output drift list only)
  • ARCHITECTURE.md absent → bootstrap (scan first, pre-fill, ask only gaps) </background_information>

Step 1 — scan the code. Read in this order, taking the first that exists for each category:

  • Top-level directory listing — infer the layered/hexagonal/clean structure.
  • Main entry points — servers, CLI binaries, background jobs.
  • Boundary code — handlers/, controllers/, repositories/, gateways/, middleware/.
  • Config and env loading.
  • Observability hooks — logger setup, metrics export, tracing init.
  • Deploy config — Dockerfile, docker-compose.yml, k8s/, terraform/, .github/workflows/, Procfile, serverless.yml.
  • doc/adr/ is the canonical ADR ledger. Read accepted ADRs to inform pattern descriptions; do not duplicate the index inside ARCHITECTURE.md.

Build a model of: layers and boundaries, data access pattern, HTTP middleware chain, async/messaging, error and validation patterns, naming conventions, logging/metrics/tracing, deployment topology.

Step 2 — pre-fill. For every <placeholder> in the template, fill from observed signals. No fabrication. If a section has no signal, write <TODO: not yet wired> in one line.

Step 3 — show only the gaps. Print:

  • (a) placeholders without a code signal;
  • (b) places where the code shows two competing patterns. One question per gap.

Step 4 — write the file. On user confirmation, write ARCHITECTURE.md at the repo root. Cut every line that does not lock a binding pattern. List any decision that should become an ADR — flag, do not write the ADR yet (use the ad-adr skill for that).

Audit-mode override: do NOT write the file. Produce a drift list. Format each line as: [file or section]: spec says X, code says Y. Suggested resolution: change spec / change code / discuss.

If something the user says contradicts what the code shows, surface the conflict. Don't silently trust the user; don't silently trust the code.

System-level patterns and boundaries. Pair with ADRs in doc/adr/ for individual decisions.

Read the full file on GitHub · 96 lines

Files

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.

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 First seen · 96 lines · 81 tokens per session scan A 730fb2dd62a8

Subscribe to this mod's changes

ad-architecture is a skill published in the GitHub repository CorridorTech/PoseCap (190 stars, last pushed 10d ago), licensed Apache-2.0. It adds 81 tokens to every session and 1,205 once invoked, about $0.0004 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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