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/ashkaan/contextium/authornpx skills add Ashkaan/contextium --skill authorgit clone --depth 1 https://github.com/Ashkaan/contextiumWhat 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 | $0.00056 | $0.04314 |
| Opus 5 | $0.00028 | $0.02157 |
| Sonnet 5 | $0.00011 | $0.00863 |
| Haiku 4.5 | $0.00006 | $0.00431 |
Grade A, and why
author 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.
How it starts
The opening of the file, as written. The whole thing — 292 lines — stays where its author put it; the contents beside it link to each section on GitHub.
/author — Unified AI-Layer Artifact Scaffolder
One skill, five branches. /author <type> [name] scaffolds a conforming
.claude/ artifact that already passes the repo's format checks, then runs that
check as a backstop. AI judgment is confined to CONTENT (filling a skeleton),
never STRUCTURE (the scaffold is deterministic). Per-branch detail lives in
references/<type>.md — loaded on demand (progressive disclosure), not inlined.
<type> ∈ {rule, skill, hook, agent, output-style}. The flow is
uniform across all five; the type only changes which template, which questions,
and which backstop.
| Type | Branch doc | What scaffold writes | verify backstop |
|---|---|---|---|
| rule | references/rule.md | nothing — inline ## <slug> (prints guidance) |
run-rule-linters.sh |
| skill | references/skill.md | .claude/skills/<name>/SKILL.md |
check-skill-format.sh |
| hook | references/hook.md | .claude/hooks/<name>.sh (or checks/) |
shellcheck + safe-mode |
| agent | references/agent.md | .claude/agents/<name>.md |
frontmatter fields (SSOT in agent.md) |
| output-style | references/output-style.md | .claude/output-styles/<name>.md |
documented-field check (unknown key, description, keep-coding-instructions) |
The four principles (enforced, not advised)
Every artifact /author emits must satisfy four principles from the original ask. They are deterministic verify.sh gates (@rule:mechanisms-not-prose), so a violation fails the check — it is not left to judgment. Sourced from Anthropic docs (skills, sub-agents, hooks).
| Principle | How it's enforced |
|---|---|
| Anthropic best practices | verify.sh: skill description ≤1,536 + third-person; hook exit-2-for-PreToolUse (emitted by placement); agent 6-field SSOT + scoped tools |
| Low token usage | verify.sh: description within the always-loaded cap; SKILL.md body ≤500 lines |
| High determinism | scaffold.sh emits correct-by-construction (right hook shape + exit code per placement); every type has a non-zero-on-violation backstop; skill branch's determinism inventory pushes data steps to scripts/ |
| Low context usage | verify.sh: SKILL.md body ≤500 lines; references/ one level deep (leaf docs) |
What ships with it
20 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.
- references/agent.md 4.4 KB
- references/hook.md 4.7 KB
- references/output-style.md 5.2 KB
- references/rule.md 8.6 KB
- references/skill.md 5.9 KB
- references/templates/agent.template.md 1.3 KB
- references/templates/hook-precommit.template.sh 1.1 KB runs code
- references/templates/hook-tooluse.template.sh 1.6 KB runs code
- references/templates/output-style.template.md 757 B
- references/templates/skill.template.md 1.1 KB
- scripts/grep-rule-peers.sh 1.1 KB runs code
- scripts/grep-rule-peers.test.sh 2.5 KB runs code
- scripts/relocate-evidence.sh 3.4 KB runs code
- scripts/relocate-evidence.test.sh 3.2 KB runs code
- scripts/run-rule-linters.sh 2.1 KB runs code
- scripts/run-rule-linters.test.sh 3.8 KB runs code
- scripts/scaffold.sh 7.5 KB runs code
- scripts/scaffold.test.sh 6.8 KB runs code
- scripts/verify.sh 13 KB runs code
- scripts/verify.test.sh 14 KB runs code
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 · 292 lines · 56 tokens per session scan A 69bdd639e58c
author is a skill published in the GitHub repository Ashkaan/contextium (32 stars, last pushed 5d ago), licensed MIT. It adds 56 tokens to every session and 4,314 once invoked, about $0.0003 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.
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