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 PackmindHub/coding-agents-matrix --skill add-agent-propertygit clone --depth 1 https://github.com/PackmindHub/coding-agents-matrixWrote 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/packmindhub/coding-agents-matrix/add-agent-property)<a href="https://agentmods.dev/skills/packmindhub/coding-agents-matrix/add-agent-property"><img src="https://agentmods.dev/badge/skills/packmindhub/coding-agents-matrix/add-agent-property/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/packmindhub/coding-agents-matrix/add-agent-property"><img src="https://agentmods.dev/badge/skills/packmindhub/coding-agents-matrix/add-agent-property.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00067 | $0.00724 |
| Opus 5.5 | $0.00027 | $0.00290 |
| Sonnet 5.5 | $0.00013 | $0.00145 |
| Haiku 4.5 | $0.00007 | $0.00072 |
Grade A, and why
add-agent-property 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 — 98 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Add Agent Property
Add a new property to the agents board by modifying four files in sequence.
Schema reference: See references/schema.md for data structures.
Workflow
1. Gather Property Details
Ask the user for:
- Property key (camelCase, e.g.,
contextWindow) - Display label (short, e.g., "Context Window")
- Tooltip description (1 sentence explaining the property)
- Cell type:
badge(yes/no/partial) ortext(free-form) - Group:
identity,packaging, orfeatures
2. Update agents-detailed.json
Add the property to every agent in src/data/agents-detailed.json:
"propertyKey": {
"value": null,
"detail": null
}
Insert after the last feature property, before additionalInfo.
3. Update groups.json
Add the property key to the appropriate group's columns array in src/data/groups.json:
{
"id": "features",
"label": "Features",
"columns": ["existingProp", "propertyKey"]
}
4. Update AgentTable.jsx
Add column definition to the columns array in src/components/AgentTable.jsx:
{ key: 'propertyKey', label: 'Label', sortable: true, cellType: 'badge', tooltip: 'Description' }
Insert at the position matching its group order.
5. Update useAgentsData.js
Add transformation in src/hooks/useAgentsData.js:
propertyKey: agent.propertyKey.value,
propertyKeyDetail: agent.propertyKey.detail,
6. Update FilterBar.jsx (for filterable properties)
If the property is in packaging or features group and has cellType: 'badge', add it to the featureOptions array in src/components/FilterBar.jsx:
{ key: 'propertyKey', label: 'Label' }
Insert in the appropriate section (Packaging or Features) following the existing order.
7. Update GitHub Issue Templates
01-update-agent.md - Add under Features section:
- [ ] **Property Label** (`propertyKey`)
- New value: <!-- yes/no/partial/null -->
- Detail:
What ships with it
1 file 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.
- 1mo ago First seen · 98 lines · 67 tokens per session scan A b171e1ed50c6
add-agent-property is a skill published in the GitHub repository PackmindHub/coding-agents-matrix (19 stars, last pushed 6d ago), licensed Apache-2.0. It adds 67 tokens to every session and 724 once invoked, about $0.0003 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 2026-08-30.
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