architecture

architecture is a command for coding agents from andkirby/markdown-ticket. It costs 0 tokens per session (2,707 once invoked), scanned A, original, MIT.

A workflow for deciding and recording how a software change should be built before coding starts. It covers the main design choices, affected components, and runtime flow.

In plain words
What is it for?
Use it to plan a feature, refactoring, or change that affects one or more parts of a codebase, and to save the design in the related Markdown ticket.
Why use it?
It prevents important design decisions from being missed or scattered across code and discussion. It also keeps small changes from collecting unnecessary paperwork.

Command

Part of the mdt plugin — 1 skill, 16 commands, 5 agents, 1 hook shipped together

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 commands/andkirby/markdown-ticket/architecture
Clone the repo
git clone --depth 1 https://github.com/andkirby/markdown-ticket

Or install mdt, the plugin that ships this one along with the rest of its 1 skill, 16 commands, 5 agents, 1 hook.

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 architecture

README.md
[![agentmods](https://agentmods.dev/badge/commands/andkirby/markdown-ticket/architecture.svg)](https://agentmods.dev/commands/andkirby/markdown-ticket/architecture)
Your own site
<a href="https://agentmods.dev/commands/andkirby/markdown-ticket/architecture"><img src="https://agentmods.dev/badge/commands/andkirby/markdown-ticket/architecture.svg" alt="Measured on agentmods" height="20"></a>
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,707 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 $0.00000 $0.02707
Opus 5 $0.00000 $0.01354
Sonnet 5 $0.00000 $0.00541
Haiku 4.5 $0.00000 $0.00271

Measured 4d ago against content hash 25a0add6642f, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

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 4d 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.

prompts/mdt/commands/architecture.md · 323 lines

How it starts

The opening of the file, as written. The whole thing — 323 lines — stays where its author put it; the contents beside it link to each section on GitHub.

MDT Architecture Design Workflow (v11)

Surface architectural decisions before implementation. Output is minimal but complete.

Core Principle: Capture decisions that matter. Skip ceremony that duplicates code.

Skill Discovery

Check AGENTS.md for skills matching this workflow. If found, invoke via Skill tool before proceeding.

User Input

$ARGUMENTS

Session Context

Use {TICKETS_PATH} in all file path templates below (if it's not defined read ticketsPath key from .mdt-config.toml).

Output Location

Mode Output Criteria
Prep (--prep flag) {TICKETS_PATH}/{CR-KEY}/prep/architecture.md Preparatory refactoring design
Simple ## Architecture Design in CR Single component or tightly scoped change; fits cleanly as a CR section
Complex {TICKETS_PATH}/{CR-KEY}/architecture.md Multiple components, cross-module coordination, or needs a standalone artifact

Don't pre-calculate complexity scores. Write the architecture, then decide where it goes based on scope.

What Good Architecture Output Looks Like

Must have:

  • Overview (2-3 sentences)
  • Pattern name + why
  • One canonical runtime flow per critical behavior
  • One owner module per critical behavior (no duplicates)
  • Structure (file tree)
  • Scope boundaries per module
  • Runtime vs test scaffolding separation
  • Architecture invariants
  • Extension rule

Include only if needed:

  • Build vs Use decisions (if evaluated)
  • Component diagram (if >3 components with non-obvious relationships)
  • Runtime prerequisites (if external deps exist)
  • Error philosophy (if non-trivial failure modes)

Never include:

  • Requirement-to-component mapping tables (code is the mapping)
  • Implementation code snippets (they drift from reality)
  • Bug fix history (git tracks this)
  • Exhaustive domain alignment tables (2-3 key concepts max)

Execution Steps

Step 0: Detect Mode

Check for --prep flag in $ARGUMENTS. If present, mode is prep.

Read the full file on GitHub · 323 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. 4d ago First seen · 323 lines · 0 tokens per session scan A 25a0add6642f

Subscribe to this mod's changes

architecture is a command published in the GitHub repository andkirby/markdown-ticket (5 stars, last pushed 18d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 2,707 tokens. 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 2026-08-31.