decision-first

decision-first is a skill for Claude Code, Codex from bearded-illirian/trailmark. It costs 89 tokens per session (1,610 once invoked), scanned A, original, MIT.

A decision-making guide for choosing between competing architecture, project-scope, or design options. It records the choice, reasoning, safety, scalability, alternatives, and a plain-language explanation.

In plain words
What is it for?
Use it when deciding how to structure a project, define its scope, or choose between technical approaches.
Why use it?
It lets the coding agent resolve important choices without stopping to ask the user every time several reasonable options exist. The recorded reasoning can still be reviewed and challenged afterward.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: installed under .agents/ (shared by several agents).

Good fit Use it when deciding how to structure a project, define its scope, or choose between technical approaches.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/bearded-illirian/trailmark/decision-first
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 bearded-illirian/trailmark --skill decision-first
Clone the repo
git clone --depth 1 https://github.com/bearded-illirian/trailmark

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 decision-first

README.md
[![agentmods](https://agentmods.dev/badge/skills/bearded-illirian/trailmark/decision-first.svg)](https://agentmods.dev/skills/bearded-illirian/trailmark/decision-first)
Your own site
<a href="https://agentmods.dev/skills/bearded-illirian/trailmark/decision-first"><img src="https://agentmods.dev/badge/skills/bearded-illirian/trailmark/decision-first.svg" alt="Measured on agentmods" height="20"></a>
Per session 89 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,610 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 β€” 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 $0.00089 $0.01610
Opus 5 $0.00044 $0.00805
Sonnet 5 $0.00018 $0.00322
Haiku 4.5 $0.00009 $0.00161

Measured 8d ago against content hash a416b272d8dc, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

decision-first scanned grade A with 0 findings against 26 rules in 11 categories β€” prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency β€” 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.

adapters/codex/.agents/skills/decision-first/SKILL.md Β· 193 lines

How it starts

The opening of the file, as written. The whole thing β€” 193 lines β€” stays where its author put it; the contents beside it link to each section on GitHub.

Decision-First Protocol

Makes a decision on behalf of the user via a 5-section model with full reasoning and alternatives. Invoked whenever the agent is about to ask an architectural / project / scope question β€” instead of asking, the skill is called.

Core idea: the user prefers autonomous decisions with transparent reasoning over back-and-forth Q&A. A decision can be contested post-hoc (round 2) β€” cheaper than a synchronous pause-and-ask.

When to call: exists 2+ reasonable alternatives and a justified selection is required. If one option is obviously correct β€” do not call, just act.

Input

An ambiguous architectural, scope, or design question the agent is about to ask the user.

Output

decision-{NN}.md capturing the choice via a 5-part model (🎯 Decision / Why / πŸ›‘ Safety / πŸ“ˆ Scalability / Alternatives / In plain language).

Hands off to

Returns control to the calling skill (typically arch-first, plan-first, or library-first).


Step 0 β€” Task context

Ensure {log_dir} and {slug} are known. Otherwise resolve from the latest task log folder.


Step 1 β€” Identify decision(s)

Auto-mode β€” pick the last unresolved question from the current conversation. If related questions cluster (e.g. "flatten + format" = 2 decisions) β€” handle all in one invocation, one artifact per decision.

Manual mode (/decision-first) β€” either process the questions the user described, or ask "which questions?".

Cutoff: obvious choice β†’ skip the skill, just act.


Step 2 β€” Apply the 5-section model

Per decision:

# D{N} β€” {short title}

🎯 **Decision:** {chosen option in one sentence}

**Why this option:**
- {specific reason 1}
- {specific reason 2}

**πŸ›‘ Security:** {security analysis. If N/A β€” explicit `not applicable`}

**πŸ“ˆ Scalability:** {scaling impact. If N/A β€” explicit `not applicable`}

| Alternative | Why rejected |
|---|---|
| {option 1} | {concrete drawback} |
| {option 2} | {concrete drawback} |

**Plain-language analogy:** {real-world analogy without technical jargon}

Read the full file on GitHub Β· 193 lines

Files

What ships with it

1 file 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. 8d ago First seen Β· 193 lines Β· 89 tokens per session scan A a416b272d8dc

Subscribe to this mod's changes

decision-first is a skill published in the GitHub repository bearded-illirian/trailmark (19 stars, last pushed 6d ago), licensed MIT. It adds 89 tokens to every session and 1,610 once invoked, about $0.0004 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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