amby-plan

amby-plan is a skill for Claude Code, Codex from ambystechcom/AmbyKit. It costs 20 tokens per session (382 once invoked), scanned A, original, MIT.

A technical planning process that explains how an approved feature specification and interface design will be built. It documents technology choices, architecture, phases, and links between requirements and implementation.

In plain words
What is it for?
Use it to produce plan.md and, when needed, supporting data models, interface contracts, or research notes.
Why use it?
It exposes technical decisions, dependencies, and risks before development starts. This gives implementation tasks a clear foundation and keeps them tied to agreed requirements.

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/ambystechcom/ambykit/amby-plan
Any agent
npx skills add ambystechcom/AmbyKit --skill amby-plan
Clone the repo
git clone --depth 1 https://github.com/ambystechcom/AmbyKit

Made for: Claude Code, Codex.

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 amby-plan

README.md
[![agentmods](https://agentmods.dev/badge/skills/ambystechcom/ambykit/amby-plan.svg)](https://agentmods.dev/skills/ambystechcom/ambykit/amby-plan)
Your own site
<a href="https://agentmods.dev/skills/ambystechcom/ambykit/amby-plan"><img src="https://agentmods.dev/badge/skills/ambystechcom/ambykit/amby-plan.svg" alt="Measured on agentmods" height="20"></a>
Per session 20 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 382 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 5.1 $0.00020 $0.00382
Opus 5 $0.00010 $0.00191
Sonnet 5 $0.00004 $0.00076
Haiku 4.5 $0.00002 $0.00038

Measured 5d ago against content hash c5a9b4bb9e59, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

amby-plan 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 5d 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/amby-plan/SKILL.md · 24 lines

What it actually says

Act as the Architect in @.amby/roles/architect.md and say so in your first line. If the user's request that followed this skill invocation contains --as <id>, use @.amby/roles/<id>.md instead; if that file is missing, stop and list the files in .amby/roles/.

Write the implementation plan for feature the user's request that followed this skill invocation (default: the current feature).

Context: read that feature's spec.md and ui.md, plus @.amby/constitution.md.

  1. Write plan.md following @.amby/templates/plan.md: technical context (stack, libraries, constraints), architecture, and a phased approach (Phase 0 research → Phase 1 foundation → feature phases).
  2. This is the first artifact with technology decisions. Ensure every choice honors the constitution (cite principle numbers).
  3. Map each FR-###/US-# to how the design satisfies it. Reference by ID — do not restate the spec. Flag any requirement you can't satisfy as a risk.
  4. Generate supporting artifacts only if needed: data-model.md (entities/invariants), contracts/ (API/interface specs), research.md (decisions with rationale).
  5. Do not invent requirements not in the spec; if you find a gap, note it and suggest a clarify.

Keep the plan lean; link to spec/UI rather than duplicating.

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. 5d ago First seen · 24 lines · 20 tokens per session scan A c5a9b4bb9e59

Subscribe to this mod's changes

amby-plan is a skill published in the GitHub repository ambystechcom/AmbyKit (2 stars, last pushed 3d ago), licensed MIT. It adds 20 tokens to every session and 382 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 2026-08-31.

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