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 skills add CrypticSwarm/Swarmforge --skill skill-writergit clone --depth 1 https://github.com/CrypticSwarm/SwarmforgeWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/crypticswarm/swarmforge/skill-writer)<a href="https://agentmods.dev/skills/crypticswarm/swarmforge/skill-writer"><img src="https://agentmods.dev/badge/skills/crypticswarm/swarmforge/skill-writer/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/crypticswarm/swarmforge/skill-writer"><img src="https://agentmods.dev/badge/skills/crypticswarm/swarmforge/skill-writer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00047 | $0.01755 |
| Opus 5.5 | $0.00019 | $0.00702 |
| Sonnet 5.5 | $0.00009 | $0.00351 |
| Haiku 4.5 | $0.00005 | $0.00176 |
Grade A, and why
skill-writer 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 1mo 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.
How it starts
The opening of the file, as written. The whole thing — 117 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill Writer
Use this guide whenever you need to create, revise, or maintain a skill (a modular package that expands the agent with domain knowledge, workflows, or tooling). Skills act like onboarding kits: they teach the agent how to approach a recurring problem reliably.
Skills at a Glance
- Specialized workflows – codified, repeatable procedures for fragile or multi-step tasks.
- Tool integrations – instructions for working with specific APIs, formats, or scripts.
- Domain expertise – company, product, or dataset knowledge that the base model lacks.
- Bundled resources – scripts, references, and assets reused across sessions.
Keep every skill lean. Assume the agent already knows general programming, writing, and reasoning; only include content that is unique to the domain or workflow.
Core Principles
-
Implicit vs explicit activation.
- Skills may be activated explicitly via the
skilltool or implicitly via strong trigger language. - For fragile or critical workflows, assume explicit activation.
- For common, narrow tasks (e.g. commit messages), optimize for implicit activation through the description.
- Skills may be activated explicitly via the
-
Protect the context window. Every token in a skill competes with live conversation history. Prefer short, actionable guidance over essays. Use tables, bullets, or concise examples instead of prose.
-
Match specificity to task fragility.
- High freedom → text instructions and heuristics (open problem spaces).
- Medium freedom → pseudocode or parameterized scripts (preferred patterns, but variations allowed).
- Low freedom → exact scripts/commands (fragile operations, compliance, or prod changes).
-
Progressive disclosure. Organize content so only the necessary layer loads:
- YAML frontmatter (
name,description) – always visible, describes when to trigger. SKILL.mdbody – core workflows (<500 lines).- Optional
scripts/,references/,assets/– loaded only when invoked.
- YAML frontmatter (
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.
- 1mo ago First seen · 117 lines · 47 tokens per session scan A 3a6513031c50
skill-writer is a skill published in the GitHub repository CrypticSwarm/Swarmforge (3 stars, last pushed 13d ago), licensed MIT. It adds 47 tokens to every session and 1,755 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-08-31.
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