Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add richfrem/agent-plugins-skills/plugin install agent-extension-authoringWrote 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/richfrem/agent-plugins-skills/authoring-plugins)<a href="https://agentmods.dev/skills/richfrem/agent-plugins-skills/authoring-plugins"><img src="https://agentmods.dev/badge/skills/richfrem/agent-plugins-skills/authoring-plugins/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/richfrem/agent-plugins-skills/authoring-plugins"><img src="https://agentmods.dev/badge/skills/richfrem/agent-plugins-skills/authoring-plugins.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 | $0.00115 | $0.00838 |
| Opus 5.5 | $0.00046 | $0.00335 |
| Sonnet 5.5 | $0.00023 | $0.00168 |
| Haiku 4.5 | $0.00012 | $0.00084 |
Grade A, and why
authoring-plugins scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured today.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 66 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Authoring Plugins (authoring-plugins)
Creates a plugin skeleton and audits a plugin as a whole; component audits are delegated to the sibling skills by name.
Contents
- Constraints • Modes • Quick start • Workflow • Verification • References
Constraints
- Self-contained skills: scripts, references and assets live inside the skill that uses them; no plugin-root shared files, no symlinks.
- Clean manifest:
.claude-plugin/plugin.jsonhas an author object and never listsskills,agentsorhooks(they are auto-discovered). apm.ymlis optional: APM installs a plugin as it is; packaging belongs topackaging-with-apm.- Portable: no
/Users/or/home/paths; use relative paths or${CLAUDE_PLUGIN_ROOT}. - No cross-plugin imports; refer to other plugins' skills by name.
- Audits are read-only.
Modes
| Mode | Use when | Entry point | Reference |
|---|---|---|---|
create |
New plugin | scripts/scaffold_plugin.py |
create-plugin.md |
audit |
Validate a plugin | scripts/audit_plugin_structure.py, scripts/audit.py |
audit-plugin.md |
Quick start
python3 scripts/scaffold_plugin.py --name <plugin-name> --path plugins [--with-hooks] [--with-mcp]
python3 scripts/audit_plugin_structure.py plugins/<plugin-name>
python3 scripts/audit.py --path plugins/<plugin-name>
audit.py runs the per-skill audit through the sibling authoring-skills skill and warns when it is not installed.
Workflow
- Pick the mode and read its reference.
- Create: scaffold, then add components with
authoring-skills,authoring-subagentsandauthoring-instructions. - Audit: run both scripts, then delegate skills, sub-agents, rules and hooks to those skills by name.
- On failure follow fallback-tree.md.
Verification
What ships with it
26 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.
- assets/templates/README.md.jinja 774 B
- evals/evals.json 2.2 KB
- references/acceptance-criteria.md 1.2 KB
- references/audit-plugin-guide.md 7.1 KB
- references/create-plugin-guide.md 4.1 KB
- references/fallback-tree.md 2.9 KB
- references/modes/audit-plugin.md 3.1 KB
- references/modes/create-plugin.md 2.7 KB
- scripts/assert_audit.py 5.2 KB runs code
- scripts/audit_plugin_l5_execute.py 1.2 KB runs code
- scripts/audit_plugin_paths.py 9.1 KB runs code
- scripts/audit_plugin_structure.py 12 KB runs code
- scripts/audit.py 10 KB runs code
- scripts/check_plugin_boundaries.py 8.6 KB runs code
- scripts/fix_plugin_load_errors.py 9.2 KB runs code
- scripts/inventory_plugin.py 17 KB runs code
- scripts/load_context.py 4.2 KB runs code
- scripts/path_reference_auditor.py 14 KB runs code
- scripts/plugin_paths_whitelist.json 215 B
- scripts/scaffold_plugin.py 3.3 KB runs code
- scripts/update_ecosystem_index.py 3.7 KB runs code
- scripts/validate_bash.py 3.0 KB runs code
- scripts/whitelist.json 3.3 KB
- tests/test_audit_plugin_structure.py 1.2 KB runs code
- tests/test_audit_sibling_lookup.py 2.4 KB runs code
- tests/test_scaffold_plugin.py 3.1 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.
- today First seen · 66 lines · 115 tokens per session scan A 7fa4ff3f3b0f
authoring-plugins is a skill published in the GitHub repository richfrem/agent-plugins-skills (7 stars, last pushed yesterday), licensed MIT. It adds 115 tokens to every session and 838 once invoked, about $0.0005 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 2026-10-24.
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