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 heymegabyte/claude-skills --skill writing-skillsgit clone --depth 1 https://github.com/heymegabyte/claude-skillsWrote 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/heymegabyte/claude-skills/writing-skills)<a href="https://agentmods.dev/skills/heymegabyte/claude-skills/writing-skills"><img src="https://agentmods.dev/badge/skills/heymegabyte/claude-skills/writing-skills/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/heymegabyte/claude-skills/writing-skills"><img src="https://agentmods.dev/badge/skills/heymegabyte/claude-skills/writing-skills.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 | $0.00020 | $0.01304 |
| Opus 5 | $0.00010 | $0.00652 |
| Sonnet 5 | $0.00004 | $0.00261 |
| Haiku 4.5 | $0.00002 | $0.00130 |
Grade A, and why
writing-skills 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 12d 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.
The source is not reproduced here
A licence we could not identify
The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.
What ships with it
9 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.
- anthropic-best-practices.md 1.6 KB
- evals/01-description-no-workflow.json 695 B
- evals/02-ordered-by-weight.json 759 B
- evals/03-human-voice.json 789 B
- examples/CLAUDE_MD_TESTING.md 2.1 KB
- graphviz-conventions.dot 5.8 KB
- persuasion-principles.md 1.5 KB
- render-graphs.js 4.7 KB runs code
- testing-skills.md 7.4 KB
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.
- 12d ago First seen · 91 lines · 20 tokens per session scan A 40a39cf2694f
writing-skills is a skill published in the GitHub repository heymegabyte/claude-skills (21 stars, last pushed yesterday), with no licence file. It adds 20 tokens to every session and 1,304 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.
Other skills, from other repositories
adr
Capture architectural decisions that have already been made, as structured ADRs (Architecture Decision Records). Use when user says 'record this decision', 'ADR this', 'why did we choose X', 'document this trade-off', 'we decided to...', or when a choice between alternatives has been settled and needs writing down.…
tf
Generic Terraform review, scaffolding, and version upgrades for AWS infrastructure using the terraform-aws-modules ecosystem. Use when user says 'review my terraform', 'before I raise an MR', 'scaffold a lambda/rds/s3/eks/vpc', 'check my .tf files', 'upgrade provider', or when working in .tf or .tfvars files. NOTE: if…
finops
AWS cost optimization — waste detection, right-sizing, Savings Plans, RIs, EKS cost, multi-account governance. Use when user says 'reduce AWS bill', 'find waste', 'right-size this', 'should I buy SP or RI', 'gp2 vs gp3', 'EKS is expensive', 'NAT gateway cost', or asks about AWS cost optimization.
github
GitHub repository operations: PRs, issues, releases, branch protection, CODEOWNERS, Dependabot, and repo settings audits. Use when user says 'review my PR', 'create a release', 'cut a release', 'tag a release', 'set up branch protection', 'add CODEOWNERS', 'audit repo settings', 'is Dependabot configured', or asks…
gitops
Argo CD and Flux review and scaffolding: mutable source refs, AppProject wildcard grants, unguarded auto-prune, sync waves and dependency ordering, selfHeal drift enforcement, and per-environment separation. Use when user says 'review my argocd', 'review my Application', 'check my flux config', 'set up gitops', 'why…
observability
Observability review and scaffolding: centralized logging, log retention, metrics scraping, alert rules that page a human, distributed tracing, dashboards, and SLO/SLI definition. Use when user says 'review my monitoring', 'do we have enough observability', 'am I flying blind', 'set up alerts', 'write alert rules'…