think-through

think-through is a skill for Claude Code from lucastamoios/skills. It costs 52 tokens per session (1,471 once invoked), scanned A, original, MIT.

A structured guide for examining difficult design choices, trade-offs, assumptions, and edge cases before deciding. It uses set reasoning exercises instead of open-ended idea generation.

In plain words
What is it for?
Use it to compare designs, check abstractions or boundaries, and investigate decisions that feel incomplete or risky.
Why use it?
It helps make an unclear concern more specific and exposes risks that may be missed when choosing between otherwise reasonable options.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: names the AskUserQuestion tool.

Good fit Use it to compare designs, check abstractions or boundaries, and investigate decisions that feel incomplete or risky.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/lucastamoios/skills/think-through
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 lucastamoios/skills --skill think-through
Clone the repo
git clone --depth 1 https://github.com/lucastamoios/skills

Made for: Claude Code.

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 think-through

README.md
[![agentmods](https://agentmods.dev/badge/skills/lucastamoios/skills/think-through/github.svg)](https://agentmods.dev/skills/lucastamoios/skills/think-through)
Your own site
<a href="https://agentmods.dev/skills/lucastamoios/skills/think-through"><img src="https://agentmods.dev/badge/skills/lucastamoios/skills/think-through/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 think-through

Your own site · 80×15
<a href="https://agentmods.dev/skills/lucastamoios/skills/think-through"><img src="https://agentmods.dev/badge/skills/lucastamoios/skills/think-through.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 52 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,471 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 $0.00052 $0.01471
Opus 5 $0.00026 $0.00736
Sonnet 5 $0.00010 $0.00294
Haiku 4.5 $0.00005 $0.00147

Measured 10d ago against content hash 10de73d2b0be, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

think-through 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 10d 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.

think-through/SKILL.md · 134 lines

How it starts

The opening of the file, as written. The whole thing — 134 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Think Through

This skill helps you reason through a design decision that feels uncertain, off, or underexplored. It is not brainstorming (that's divergent). It is not requirements gathering (that's about what). It is structured convergent thinking about a specific choice and its consequences.

Use it when you have a gut feeling something is wrong but cannot articulate why, or when two valid options seem equivalent but you suspect they are not.

Argument: $ARGUMENTS

When to use this skill

  • "Something feels off about this design but I can't say what"
  • "We have two options and I don't know which is better"
  • "This works but I'm worried about edge cases I haven't thought of"
  • "Is this the right abstraction / key / boundary / name?"

Process

Work through these steps in order. Each step is its own message - do not combine them. Wait for the user's reaction before moving to the next step.

Step 1: Frame the decision

State the decision clearly in one sentence. Then state the two (or more) options being considered. If the user gave a vague "something feels off," help them articulate what the actual decision point is.

Format:

Decision:

Option A: Option B: (more if needed)

Current leaning: <which option and why, or "unsure">

Read relevant code, docs, and requirements to ground the framing in reality. Do not frame based on assumptions - verify what actually exists.

Step 2: Three-property test (if the decision involves identity, keys, or dedup)

If the decision involves choosing what goes into an identifier, key, or dedup mechanism, run the three-property test:

Property Definition Option A Option B
Deterministic Same logical input always produces the same key ? ?
Unique Different logical events produce different keys ? ?
Stable Retries of the same event do not change the key ? ?

Read the full file on GitHub · 134 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. 10d ago First seen · 134 lines · 52 tokens per session scan A 10de73d2b0be

Subscribe to this mod's changes

think-through is a skill published in the GitHub repository lucastamoios/skills (3 stars, last pushed 3mo ago), licensed MIT. It adds 52 tokens to every session and 1,471 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 2026-08-31.

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