decider

A system for recording important architecture choices in numbered decision documents, with an index and search commands. An architecture decision record explains a significant technical choice and why it was made.

In plain words
What is it for?
Use it to search, list, read, create, or replace architecture decision records, subject to the required approval for creating them.
Why use it?
It helps agents find existing design decisions before proposing changes and prevents new work from quietly contradicting agreed choices.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/vanillagreencom/kendex/decider
Any agent
npx skills add vanillagreencom/kendex --skill decider
Clone the repo
git clone --depth 1 https://github.com/vanillagreencom/kendex

Made for: Claude Code, Codex.

Per session 17 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 485 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00017 $0.00485
Opus 5 $0.00009 $0.00243
Sonnet 5 $0.00003 $0.00097
Haiku 4.5 $0.00002 $0.00049

Measured 2d ago against content hash ff0bd51d087a, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

decider 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 2d ago.

The scan reads SKILL.md. This mod also ships 6 executable files (scripts/lib/kendex-env.sh, tests/decider-index-parse.test.sh, tests/decider-issue-action-hint.test.sh, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

.agents/skills/decider/SKILL.md · 44 lines

What it actually says

Decider

Problem with this skill? Run kendex report — it files to the owning repo automatically. Do not hand-file.

Numbered decision documents indexed in one INDEX.md (default docs/decisions/), with a search CLI, canonical format, and creation/supersession workflows.

.agents/skills/decider/scripts/decisions <command> [options]

Actions (search, search --issue, list, next-id, get), search coverage and scoring, output shapes, and the DECISIONS_DIR / DECISION_ID_* environment: decisions --help. There is no bare issue action; use search --issue.

Read the full decision file before acting on a hit. A suggestion contradicting an active decision is invalid unless the decision itself is flawed.

Workflows

Workflow Trigger
workflows/create-decision.md A significant path choice is settled
workflows/update-decision.md A new decision supersedes, partially supersedes, or revisits an existing one

Format: schemas/decision-format.md (constraints), templates/decision-entry.md (document skeleton), templates/index-row.md (INDEX row).

Approval

Never create a decision document without explicit user approval. When work settles a choice worth recording, say on completion: "this introduced a decision worth recording: [summary]. Want me to create a decision entry?"

Record: technology selections with alternatives, performance trade-offs, path choices whose conditions may change. Do not record: variable names, small refactors, bug fixes, choices with no realistic alternative, standard pattern applications.

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. 2d ago First seen · 44 lines · 17 tokens per session scan A ff0bd51d087a

Subscribe to this mod's changes

decider is a skill published in the GitHub repository vanillagreencom/kendex (65 stars, last pushed today), licensed MIT. It adds 17 tokens to every session and 485 once invoked, about $0.0001 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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