living-docs

Rules for maintaining documentation as an evolving system, including architecture decisions, product requirements, project principles, and behavior decisions. It also defines safeguards against documentation drifting away from the code.

In plain words
What is it for?
Use it to manage ADRs, BDRs, PRDs, constitutions, and other project documents while preserving the history of superseded decisions.
Why use it?
It keeps important decisions and project rules discoverable and prevents outdated documents from quietly becoming misleading.

Cursor rule for Cursor

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 rules/ejklock/living-docs-skill/living-docs
Clone the repo
git clone --depth 1 https://github.com/ejklock/living-docs-skill

Made for: Cursor.

Per session 0 Nothing until a file matches its globs; then the whole rule loads.
When invoked 1,724 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin unknown 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 $0.00000 $0.01724
Opus 5 $0.00000 $0.00862
Sonnet 5 $0.00000 $0.00345
Haiku 4.5 $0.00000 $0.00172

Measured 2d ago against content hash 1b1c211f0ff7, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

living-docs 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.

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.

.cursor/rules/living-docs.mdc · 72 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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 · 72 lines · 0 tokens per session scan A 1b1c211f0ff7

Subscribe to this mod's changes

living-docs is a cursor rule published in the GitHub repository ejklock/living-docs-skill (11 stars, last pushed 5d ago), with no licence file. It costs nothing until one of its globs matches a file; then it loads 1,724 tokens. 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.