coding-agent

An AI coding assistant that explores a codebase, proposes a plan, applies approved changes, and checks the result with human review at key stages.

In plain words
What is it for?
Use it to implement and verify repository changes, while loading additional instructions from a .skills directory when needed.
Why use it?
It structures coding work so you can inspect the plan and changes before they are carried out or accepted.

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/memgrafter/flatmachines/custom_coding_workflow
Any agent
npx skills add memgrafter/flatmachines --skill custom_coding_workflow
Clone the repo
git clone --depth 1 https://github.com/memgrafter/flatmachines

Made for: Claude Code, Codex.

Per session 25 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 171 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 $0.00025 $0.00171
Opus 5 $0.00013 $0.00086
Sonnet 5 $0.00005 $0.00034
Haiku 4.5 $0.00003 $0.00017

Measured 2d ago against content hash 8b0b0aaa26a7, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

coding-agent 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.

The scan reads SKILL.md. This mod also ships 20 executable files (js/hello_world.py, js/run.sh, js/src/coding_agent/hooks.ts, …), 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.

sdk/examples/custom_coding_workflow/SKILL.md · 31 lines

What it actually says

Coding Agent

An agentic coding assistant with human-in-the-loop review.

Usage

cd python && ./run.sh "Add input validation to the User model" --cwd /path/to/project

Flow

  1. Explore — Gathers codebase context
  2. Plan — Generates implementation plan → human reviews
  3. Execute — Applies changes using MCP filesystem
  4. Verify — Reviews changes → human approves

Skills Integration

Symlink skills for the agent to use:

ln -s /path/to/skills .skills

The agent loads skills on-demand from .skills/ directory.

Files

What ships with it

39 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. 2d ago First seen · 31 lines · 25 tokens per session scan A 8b0b0aaa26a7

Subscribe to this mod's changes

coding-agent is a skill published in the GitHub repository memgrafter/flatmachines (37 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 25 tokens to every session and 171 once invoked, about $0.0001 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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