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.
npx agentmods add skills/abilityai/abilities/create-playbooknpx skills add Abilityai/abilities --skill create-playbookgit clone --depth 1 https://github.com/Abilityai/abilitiesWhat 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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00025 | $0.08689 |
| Opus 5 | $0.00013 | $0.04345 |
| Sonnet 5 | $0.00005 | $0.01738 |
| Haiku 4.5 | $0.00003 | $0.00869 |
Grade B, and why
create-playbook scanned grade B with 1 finding 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.
Enumerates other installed skillsmediumAgent snooping
Other skills' SKILL.md files reveal prompts, capabilities and secrets that should be invisible to peers.
ls -d .claude/skills/*/ 2>/dev/null | head -10 How it starts
The opening of the file, as written. The whole thing — 448 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Create Playbook
ℹ️ First, set expectations: before anything else, print one short line with this skill's version and its most recent change — the top entry of
metadata.changelogabove — e.g.create-playbook vX.Y — recent: <summary>. Then proceed.
Create a new skill. Determines the right complexity tier and generates from the appropriate template.
For concepts and patterns, see the README. Tier templates are bundled with this skill in templates/ — reference them at runtime via
${CLAUDE_SKILL_DIR}/templates/.
Workflow
Step 1: Check for Existing Skills
ls -d .claude/skills/*/ 2>/dev/null | head -10
ls -d ~/.claude/skills/*/ 2>/dev/null | head -10
If similar skill exists, ask: update it, create variant, or proceed with new?
Step 2: Gather Core Requirements
Ask or extract from context:
- Name: lowercase-with-hyphens, descriptive. For project/personal skills the directory name is the command (
name:is display-only); for plugin skillsname:sets the command segment — keep name and directory identical so they never drift. - Purpose → the
description:field: third person, what it does + when to use it, key use case first — the skill listing truncatesdescription+when_to_useat 1,536 characters. - Tools needed: Which tools will it use?
Step 3: Determine Complexity Tier
Ask these questions to classify:
Q1: Does this skill read or write any files, APIs, or external state?
- NO → Tier 1: Simple Skill (skip to Step 4)
- YES → Continue to Q2
Q2: Will this run unattended, on a schedule, or need reliability guarantees?
- NO → Tier 2: Stateful Skill (skip to Step 4)
- YES → Continue to Q3
Q3: What automation level?
- Safe to run completely unattended, no approval needed at any point →
autonomous - Needs human approval at checkpoints →
gated - Human monitors entire execution →
manual
⚠️ Critical: If user says "autonomous" but also mentions approval/review steps, clarify:
"Autonomous playbooks cannot have approval gates — they run unattended and would hang waiting for approval that never comes. Should this be
gatedinstead?"
What ships with it
5 files 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.
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.
- 2d ago First seen · 448 lines · 25 tokens per session scan B 062c180fc8e9
create-playbook is a skill published in the GitHub repository Abilityai/abilities (11 stars, last pushed 14d ago), licensed MIT. It adds 25 tokens to every session and 8,689 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it B with 1 finding (enumerates other installed skills). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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