ship-first-plan

ship-first-plan is a skill for Claude Code, Codex from tallesborges/zdx. It costs 56 tokens per session (1,552 once invoked), scanned A, original, MIT.

A planning method for building the first usable version of a product in small, demonstrable phases.

In plain words
What is it for?
It is for ordering dependencies, defining one observable outcome per phase, attaching decisions to the phase they affect, and postponing later work until there is a reason to start it.
Why use it?
It keeps implementation focused on the smallest useful result and makes each phase have a clear stopping point.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: mentions subagents; mentions AGENTS.md.

Good fit It is for ordering dependencies, defining one observable outcome per phase, attaching decisions to the phase they affect, and postponing later work until there is a reason to start it.

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Install with agentmods
npx agentmods add skills/tallesborges/zdx/ship-first-plan
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.

Any agent
npx skills add tallesborges/zdx --skill ship-first-plan
Clone the repo
git clone --depth 1 https://github.com/tallesborges/zdx

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 ship-first-plan

README.md
[![agentmods](https://agentmods.dev/badge/skills/tallesborges/zdx/ship-first-plan/github.svg)](https://agentmods.dev/skills/tallesborges/zdx/ship-first-plan)
Your own site
<a href="https://agentmods.dev/skills/tallesborges/zdx/ship-first-plan"><img src="https://agentmods.dev/badge/skills/tallesborges/zdx/ship-first-plan/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for ship-first-plan

Your own site · 80×15
<a href="https://agentmods.dev/skills/tallesborges/zdx/ship-first-plan"><img src="https://agentmods.dev/badge/skills/tallesborges/zdx/ship-first-plan.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 56 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,552 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
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 $0.00056 $0.01552
Opus 5 $0.00028 $0.00776
Sonnet 5 $0.00011 $0.00310
Haiku 4.5 $0.00006 $0.00155

Measured 8d ago against content hash 330a729e33c7, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

ship-first-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 8d 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.

crates/zdx-assets/bundled_skills/ship-first-plan/SKILL.md · 108 lines

How it starts

The opening of the file, as written. The whole thing — 108 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Ship-First Plan

Goal

Create the smallest grounded plan that reaches the first usable version of the requested capability through demoable, incremental phases.

Hard constraints

  • Stop at usable: plan through the first usable version of the capability, ordered by real dependencies. Later holds rollout, hardening, polish, and follow-on capabilities as one-liners with triggers. Correctness and security for the behavior you ship belong in the phase that ships it.
  • One behavior per phase: each phase adds one capability or changes one observable behavior. Its checklist items build that behavior; its ✅ Demo exercises it and states the observed result. Multi-step setup is fine when it proves a single new outcome; two new outcomes are two phases.
  • Bounded exit each: each phase is work you intend now and has a bounded exit. Conditional work lives in Later with the trigger that would start it.
  • Gates attach to their phase: approvals, ownership questions, and research attach as a gate note on the phase they block; the phase's ✅ Demo stays an observation of system behavior.
  • Smallest implementation: a phase's abstractions, config, schema, flags, and interfaces are paid for by the behavior it ships. Shared code moves to a shared home once a second consumer exists.
  • Reuse before rebuild: before proposing a new module, config, schema, or abstraction, explore the codebase for existing functionality/patterns that already do it (or most of it). Extend what exists rather than standing a parallel implementation beside it.
  • Scope from Inputs: build the capabilities present in the Inputs, using the illustrative examples the Inputs provide.

Workflow

Operate read-only while researching and drafting — the only file you create is the saved plan itself (step 6).

Delegation guard: a delegated drafter gets these Hard constraints, the template below, and a brief carrying five things — the goal, the current state, the constraints, the success signal, and the code findings that change what you would build. That brief is complete on its own.

Read the full file on GitHub · 108 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. 8d ago First seen · 108 lines · 56 tokens per session scan A 330a729e33c7

Subscribe to this mod's changes

ship-first-plan is a skill published in the GitHub repository tallesborges/zdx (20 stars, last pushed 4d ago), licensed MIT. It adds 56 tokens to every session and 1,552 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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