discovery

discovery is a skill for Claude Code, Codex from mrtblount/Spec-to-Ship. It costs 44 tokens per session (1,767 once invoked), scanned A, original, MIT.

A product-discovery skill examines an existing codebase and then conducts a structured interview about the product. It covers the problem, target users, features, priorities, and possible AI needs.

In plain words
What is it for?
Use it when preparing a PRD for a new or existing product. For an existing product, it reviews documentation, dependencies, project structure, integrations, and user-facing features before the interview.
Why use it?
It gives product planning a picture of what already exists before new requirements are gathered. The interview turns scattered ideas into clearer product context.

Skill for Claude CodeCodex

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

Good fit Use it when preparing a PRD for a new or existing product. For an existing product, it reviews documentation, dependencies, project structure, integrations, and user-facing features before the interview.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/mrtblount/spec-to-ship/discovery
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 mrtblount/Spec-to-Ship --skill discovery
Clone the repo
git clone --depth 1 https://github.com/mrtblount/Spec-to-Ship

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 discovery

README.md
[![agentmods](https://agentmods.dev/badge/skills/mrtblount/spec-to-ship/discovery.svg)](https://agentmods.dev/skills/mrtblount/spec-to-ship/discovery)
Your own site
<a href="https://agentmods.dev/skills/mrtblount/spec-to-ship/discovery"><img src="https://agentmods.dev/badge/skills/mrtblount/spec-to-ship/discovery.svg" alt="Measured on agentmods" height="20"></a>
Per session 44 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,767 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.
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 $0.00044 $0.01767
Opus 5 $0.00022 $0.00883
Sonnet 5 $0.00009 $0.00353
Haiku 4.5 $0.00004 $0.00177

Measured 8d ago against content hash 05ea841a5c8a, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

discovery 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.

prd-builder/sub-skills/discovery/SKILL.md · 214 lines

How it starts

The opening of the file, as written. The whole thing — 214 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Part A: Codebase Scan (EXISTING_PRODUCT mode only)

If mode is EXISTING_PRODUCT, scan the codebase BEFORE interviewing the user. This gives you context to ask smarter questions.

STEP 1: Project Overview Scan

READ (in parallel where possible):
  - README.md or similar documentation
  - package.json / requirements.txt / Cargo.toml / pyproject.toml (dependencies, scripts)
  - CLAUDE.md or project context files
  - Any existing PRD, product docs, or specs in the project
  - .env.example or .env.local (to understand what services are used — DO NOT read .env)

STEP 2: Architecture Scan

SCAN the codebase structure:
  - Use Glob to map the directory structure (src/, app/, pages/, components/, etc.)
  - Identify the tech stack (framework, database, APIs, services)
  - Identify major features by looking at route files, page components, API endpoints
  - Look for authentication, payments, admin panels, or other common product patterns

STEP 3: Feature Inventory

Based on the scan, create a bullet-point inventory:
  - What the product appears to do (core functionality)
  - What tech stack it uses
  - What external services/APIs it integrates with
  - What user-facing features exist
  - What appears to be in progress or incomplete

STEP 4: Present to User

PRESENT the inventory:
  "Based on scanning your codebase, here's what I understand about your product:
  [inventory]

  Is this accurate? What am I missing or getting wrong?"

INCORPORATE corrections before proceeding to the interview.

Part B: Discovery Interview

Walk the user through focused questions. Adapt based on their responses — skip questions they've already answered, dig deeper where they're vague.

Interview Protocol:

  • Ask 2-3 questions at a time, not all at once
  • Use their language, not PM jargon
  • If they give a vague answer, ask a follow-up to sharpen it
  • If they say "I don't know," that's fine — log it as an open question
  • For existing products, reference what you found in the codebase scan

Read the full file on GitHub · 214 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 · 214 lines · 44 tokens per session scan A 05ea841a5c8a

Subscribe to this mod's changes

discovery is a skill published in the GitHub repository mrtblount/Spec-to-Ship (2 stars, last pushed 1mo ago), licensed MIT. It adds 44 tokens to every session and 1,767 once invoked, about $0.0002 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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