writing-skills is agent-read markdown (skill) from ganyuanran/aegis: Use when creating new skills, editing existing skills, or verifying skills work before deployment.
Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.
What the file says
# Writing Skills
## Purpose
Create the smallest reusable skill that changes decisions or improves task
execution without constraining unrelated work. Skill changes use behavior
validation, not a code TDD route. This validation does not require loading `aegis:test-driven-development`.
## Default Path
### 1. Establish Need And Ownership
- Name the reusable behavior gap, intended users/hosts, and non-goals.
- Check whether an existing skill, project rule, host adapter, or automated
check already owns it. Prefer the smallest existing owner.
- For an existing skill, inspect its references, manifests or generated copies,
discovery tests, and bundled resources before changing or retiring them.
- Create a skill only for reusable, non-obvious guidance. Keep one-off project
conventions in the project owner and automate mechanical constraints when
practical.
### 2. Record Behavior Before Editing
Use representative tasks, not questions that merely ask the agent to recite
instructions.
- New skill: run a no-skill control.
- For an existing skill, run the current version first; add a no-skill ablation
only when testing whether the skill itself needs to exist.
…
Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.
A 17 of 17 checks passed. Deterministic, no model, same answer every run.
pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (5315 bytes)
pass: No zero-width or bidi control characters
pass: No instruction hidden inside an HTML comment
pass: No link to an exfiltration or paste host
pass: No credential-shaped string
pass: No instruction to send local credentials anywhere
pass: No text hidden with inline styles
pass: No prompt-injection phrasing
pass: No curl or wget piped into a shell
pass: No recursive delete of root, home or parent
pass: No instruction to read or print local credentials
pass: No base64 blob over 200 characters
pass: No link to a raw IP address
pass: No script tag
Source
GitHub
ganyuanran/aegis · 1,280 stars · license MIT · pushed 2026-09-24 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_ydfe33qdip3xgkom
GET https://markdownregistry.com/api/v1/resolve?ref=ganyuanran/aegis/writing-skills
GET https://markdownregistry.com/api/v1/blob/9e74b7e83faacbd21079eb267bbc20109b0c741180a7dd3780d2bc6e83299604
Your agent does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
ganyuanran/aegis · skills/brainstorming/SKILL.md · Use when defining ambiguous or high-complexity new features, product behavior, UI/component design, architecture…
ganyuanran/aegis · skills/communicating-concisely/SKILL.md · Use when the user asks for caveman mode, fewer tokens, brief responses, compressed communication, or otherwise…
ganyuanran/aegis · skills/dispatching-parallel-agents/SKILL.md · Use when facing 2+ independent tasks without a written plan, with no conflicting shared mutable state or sequential…
ganyuanran/aegis · skills/establishing-project-context/SKILL.md · Use when the user asks to establish shared project language, or project work exposes a conflicting, renamed, or…
ganyuanran/aegis · skills/executing-plans/SKILL.md · Use when executing a written implementation plan across sessions or with review checkpoints. Small or single-slice…
ganyuanran/aegis · skills/finishing-a-development-branch/SKILL.md · Use when verified work needs integration or cleanup of an existing task-created branch/worktree, or the user explicitly…
ganyuanran/aegis · skills/first-principles-review/SKILL.md · Use when asked for first-principles or Occam's-razor review, or when high-risk decisions involve competing constraints…
ganyuanran/aegis · skills/goal-framing/SKILL.md · Use when the user explicitly sets an Aegis goal with /aegis-goal, Aegis goal:, or asks to define goal, success…
ganyuanran/aegis · skills/long-task-continuation/SKILL.md · Use when a task is multi-step, may span context resets or sessions, uses subagents, or risks losing state before…
a5c-ai/babysitter · library/methodologies/superpowers/skills/writing-skills/SKILL.md · Use when creating new skills, editing existing skills, or verifying skills work before deployment.
coco-research/coco · skills/writing-skills/SKILL.md · Use when creating new skills, editing existing skills, or verifying skills work before deployment
jamditis/claude-skills-journalism · superjawn/skills/writing-skills/SKILL.md · Use when creating new skills, editing existing skills, or verifying skills work before deployment
ed3dai/ed3d-plugins · plugins/ed3d-extending-claude/skills/writing-skills/SKILL.md · Use when creating new skills, editing existing skills, or verifying skills work before deployment - applies TDD to…
xu123-bob/baize · agent/skills/superpowers/5.1.0/skills/writing-skills/SKILL.md · Use when creating new skills, editing existing skills, or verifying skills work before deployment
