Agent skill

Decision Log

by MAGA2010 in MAGA2010/hackathon-run

Writes every KEEP/CUT/DEFER/PIVOT scope decision into an append-only team log with rationale, author, and timestamp.

MITAuto-check passedDevelopment

Install Decision Log

skills CLI

$ npx skills add MAGA2010/hackathon-run --skill decision-log -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install MAGA2010/hackathon-run decision-log --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/MAGA2010/hackathon-run.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/decision-log .claude/skills/decision-log && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "decision-log" agent skill from https://github.com/MAGA2010/hackathon-run/tree/main/skills/decision-log into .claude/skills/decision-log/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "decision-log", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/MAGA2010/hackathon-run/tree/main/skills/decision-log

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add MAGA2010/hackathon-run --skill decision-log -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install MAGA2010/hackathon-run decision-log --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/MAGA2010/hackathon-run.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/decision-log .agents/skills/decision-log && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "decision-log" agent skill from https://github.com/MAGA2010/hackathon-run/tree/main/skills/decision-log into .agents/skills/decision-log/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "decision-log", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add MAGA2010/hackathon-run --skill decision-log -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install MAGA2010/hackathon-run decision-log --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/MAGA2010/hackathon-run.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/decision-log .cursor/skills/decision-log && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "decision-log" agent skill from https://github.com/MAGA2010/hackathon-run/tree/main/skills/decision-log into .cursor/skills/decision-log/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "decision-log", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/MAGA2010/hackathon-run.git --path skills/decision-log

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add MAGA2010/hackathon-run --skill decision-log -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install MAGA2010/hackathon-run decision-log --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/MAGA2010/hackathon-run.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/decision-log .gemini/skills/decision-log && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "decision-log" agent skill from https://github.com/MAGA2010/hackathon-run/tree/main/skills/decision-log into .gemini/skills/decision-log/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "decision-log", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install MAGA2010/hackathon-run decision-log

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add MAGA2010/hackathon-run --skill decision-log -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/MAGA2010/hackathon-run.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/decision-log .github/skills/decision-log && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "decision-log" agent skill from https://github.com/MAGA2010/hackathon-run/tree/main/skills/decision-log into .github/skills/decision-log/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "decision-log", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add MAGA2010/hackathon-run --skill decision-log -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install MAGA2010/hackathon-run decision-log --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/MAGA2010/hackathon-run.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/decision-log .opencode/skills/decision-log && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "decision-log" agent skill from https://github.com/MAGA2010/hackathon-run/tree/main/skills/decision-log into .opencode/skills/decision-log/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "decision-log", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: decision-log
GitHub stars: 367
Token cost: ~847 tokens
SKILL.md length: 313 words
Files: 2 (incl. scripts)
Skills in repo: 15
Repo updated: Oct 7, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Writes every KEEP/CUT/DEFER/PIVOT scope decision into an append-only team log with rationale, author, and timestamp.

Works in 3 steps: Capture the decision → Append to the log → Emit the transcript
Tasks that involve Architecture decision records
SKILL.md covers Input contract, Execution, Output contract and Acceptance criteria, plus 3 more sections
Runs Python scripts from its folder; calls python3

What it does

Decision Log is an agent skill from MAGA2010/hackathon-run. Writes every KEEP/CUT/DEFER/PIVOT scope decision into an append-only team log with rationale, author, and timestamp. Use after scope-knife or any time the team changes direction.

Its SKILL.md is about 850 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including scripts (for example `scripts/log_decision.py`).

It sits in Development, covering Architecture decision records. The licence is MIT.

When your agent uses it

Tasks that involve Architecture decision records

Example prompts

“Use the decision-log skill to write every KEEP/CUT/DEFER/PIVOT scope decision into an append-only team log with rationale, author, and timestamp”
“/decision-log”

Requirements

Python 3

Workflow steps

3 steps, taken from the step headings in SKILL.md.

Capture the decision
Append to the log
Emit the transcript

What it can do on your machine

Read from SKILL.md and the folder at commit de3bcfb. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Ships 1 file in scripts/ (Python), which the agent can run.
Shell commands in SKILL.md call:
- python3
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Decision Log loads about 847 tokens when it runs. Until then it costs about 48 tokens; SKILL.md has 313 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~48
When it runs · the whole SKILL.md, loaded when a task matches: ~847

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.

SKILL.md

The full file from MAGA2010/hackathon-run at commit de3bcfb, republished under its MIT licence (© MAGA2010). 313 words, ~847 tokens.

Download SKILL.mdSave it as .claude/skills/decision-log/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.

name: decision-log
description: Writes every KEEP/CUT/DEFER/PIVOT scope decision into an append-only team log with rationale, author, and timestamp. Use after scope-knife or any time the team changes direction.
when_to_use: Trigger when the user says "log the decision", "record the cut", "why did we cut X", or right after scope-knife classifies a feature. Do not invoke before…
version: 1.0
category: lifecycle
tags: ["append-only", "audit-trail", "keep-cut-defer-pivot"]
dependencies: ["scope-knife"]
side_effects: ["decision-log"]
triggers: ["log a decision", "record what we decided", "decision history", "keep cut defer", "append-only"]

decision-log

The retro can only teach you what the team remembers, and the team forgets by minute 90. decision-log makes the memory durable: every scope decision is appended with its rationale so the "why" survives to the retrospective and the next hackathon.

Input contract

Required:

feature: string — the feature or subject being decided (e.g. "Notifications")
classification: enum — KEEP, CUT, DEFER, or PIVOT
rationale: string — one sentence explaining why

Optional:

author: string — name or handle of whoever made the call
relates_to: string — state file this decision relates to (default plan.json)
out_dir: path — where .hackathon/ lives (default .hackathon)

Execution

1. Capture the decision

When scope-knife emits a classification, or the team changes direction mid-build, ask:

What is the feature or subject?
Which classification: KEEP, CUT, DEFER, or PIVOT?
What is the one-sentence rationale?

2. Append to the log

bash

python3 skills/decision-log/scripts/log_decision.py \
  --feature "Notifications" \
  --classification CUT \
  --rationale "Off demo path; removed for time." \
  --author alice

The script never overwrites: it reads the existing decision-log.json, appends the entry, and writes it back.

3. Emit the transcript

The script also writes .hackathon/artifacts/decision-log.md with every decision in reverse chronological order, ready to paste into the retro or a handoff doc.

Output contract

.hackathon/state/decision-log.json — append-only record (matches decision-log.schema.json)
.hackathon/artifacts/decision-log.md — human-readable transcript

Acceptance criteria

Every entry has at, feature, classification, and rationale.
classification is one of KEEP / CUT / DEFER / PIVOT.
Append mode never replaces existing entries.
decision-log.json validates against decision-log.schema.json.
Transcript lists decisions newest-first.

Failure modes

rationale empty -> refuse; a decision without a reason is not a decision.
classification not in enum -> refuse; ask for KEEP/CUT/DEFER/PIVOT.
Existing log with mismatched version -> refuse; do not clobber a newer log.
Nothing to log (no decision made) -> suggest scope-knife first.

Trigger phrases (for agent intent matching)

"log the decision"
"record the cut"
"why did we cut X"
"decision log"
"add a KEEP"
"we changed direction"

Files

SKILL.md and 1 other file (scripts) in skills/decision-log of MAGA2010/hackathon-run.

SKILL.md
scripts/log_decision.py

Open the folder on GitHubat commit de3bcfb

Compare with similar skills

Decision Log next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Decision Log compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Decision Log this skillMAGA2010/hackathon-run	367	—	~847	Automated safety check: Pass	MIT	today
PR Design DocOpenHands/OpenHands	90k	—	~2.4k	Automated safety check: Pass	MIT	today
Cto AdvisorIbrahim-3d/orchestrator-supaconductor	380	4 repos	~2.4k	Automated safety check: Pass	MIT	11 days ago
Improve Codebase Architectureywwynm/EverythingDone	144	15 repos	~1.3k	Automated safety check: Pass	GPL-3.0	24 days ago
Domain Modelingbrim-borium/spotify_sdk	166	5 repos	~806	Automated safety check: Pass	Apache-2.0	yesterday
Design Doc MermaidSpillwaveSolutions/design-doc-mermaid	175	1 repos	~5.6k	Automated safety check: Pass	None	1 mo ago

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Questions about Decision Log

What does Decision Log do?

Writes every KEEP/CUT/DEFER/PIVOT scope decision into an append-only team log with rationale, author, and timestamp. Decision Log is an agent skill from MAGA2010/hackathon-run. Writes every KEEP/CUT/DEFER/PIVOT scope decision into an append-only team log with rationale, author, and timestamp.

When should I use Decision Log?

Decision Log fits situations like: tasks that involve Architecture decision records.

How do I install Decision Log in Claude Code?

Run `npx skills add MAGA2010/hackathon-run --skill decision-log -a claude-code`. Or copy the skill folder (skills/decision-log in MAGA2010/hackathon-run) into .claude/skills/decision-log in your project. Claude Code loads it when a task matches its description.

How do I install Decision Log in Codex?

Run `npx skills add MAGA2010/hackathon-run --skill decision-log -a codex`. Or copy the skill folder (skills/decision-log in MAGA2010/hackathon-run) into .agents/skills/decision-log in your project. Codex loads it when a task matches its description.

Can I use Decision Log in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add MAGA2010/hackathon-run --skill decision-log -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/decision-log, .gemini/skills/decision-log, .github/skills/decision-log and .opencode/skills/decision-log in your project.

What does Decision Log need to run?

Going by SKILL.md and its folder, Decision Log needs Python for the scripts in its folder and the command-line tools its instructions call (python3). Our summary lists: Python 3.

Does Decision Log access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Decision Log safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.

What licence does Decision Log use?

Decision Log is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Decision Log use?

About 847 tokens (SKILL.md is roughly 3.4k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Decision Log?

Skills that share tags, products or a category with Decision Log: PR Design Doc (OpenHands/OpenHands, 90k stars), Cto Advisor (Ibrahim-3d/orchestrator-supaconductor, 380 stars), Improve Codebase Architecture (ywwynm/EverythingDone, 144 stars) and Domain Modeling (brim-borium/spotify_sdk, 166 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Decision Log?

MAGA2010 (a GitHub user) maintains it in MAGA2010/hackathon-run, which has 367 GitHub stars. The repository holds 15 skills in this directory. The repository was last updated on October 7, 2026.

Source: MAGA2010/hackathon-run on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Decision Log

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

decision-log

Input contract

Execution

1. Capture the decision

2. Append to the log

3. Emit the transcript

Output contract

Acceptance criteria

Failure modes

Trigger phrases (for agent intent matching)

See also

Files

Compare with similar skills

Similar skills

More from MAGA2010/hackathon-run

Related

Questions about Decision Log