add-agent-property

add-agent-property is a skill for Claude Code from PackmindHub/coding-agents-matrix. It costs 67 tokens per session (724 once invoked), scanned A, original, Apache-2.0.

A workflow for adding a new field to an AI-agent comparison table. It updates the data, field groups, table display, and issue templates in the required order.

In plain words
What is it for?
Use it to introduce a property such as context size or supported features across every agent record and the comparison interface.
Why use it?
It prevents a new comparison field from being added in one place but missed in another. This keeps the database and visible table aligned.

Skill for Claude Code

Written for Claude Code: installed under .claude/.

Good fit Use it to introduce a property such as context size or supported features across every agent record and the comparison interface.

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Install with agentmods
npx agentmods add skills/packmindhub/coding-agents-matrix/add-agent-property
Install

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.

Any agent
npx skills add PackmindHub/coding-agents-matrix --skill add-agent-property
Clone the repo
git clone --depth 1 https://github.com/PackmindHub/coding-agents-matrix

Made for: Claude Code.

Wrote 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.

agentmods badge for add-agent-property

README.md
[![agentmods](https://agentmods.dev/badge/skills/packmindhub/coding-agents-matrix/add-agent-property/github.svg)](https://agentmods.dev/skills/packmindhub/coding-agents-matrix/add-agent-property)
Your own site
<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.

agentmods 80×15 button for add-agent-property

Your own site · 80×15
<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>
Per session 67 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 724 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce 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

Measured 1mo ago against content hash b171e1ed50c6, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

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.

.claude/skills/add-agent-property/SKILL.md · 98 lines

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) or text (free-form)
  • Group: identity, packaging, or features

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:

Read the full file on GitHub · 98 lines

Files

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.

Changes

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.

  1. 1mo ago First seen · 98 lines · 67 tokens per session scan A b171e1ed50c6

Subscribe to this mod's changes

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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