add-agent-property

add-agent-property is a skill for Claude Code, Codex 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 CodeCodex

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.

agentmods
npx agentmods add skills/packmindhub/coding-agents-matrix/add-agent-property
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, Codex.

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.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.svg" alt="Measured on agentmods" 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. Scan, not verified.
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 $0.00067 $0.00724
Opus 5 $0.00034 $0.00362
Sonnet 5 $0.00013 $0.00145
Haiku 4.5 $0.00007 $0.00072

Measured 4d ago against content hash b171e1ed50c6, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, 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 4d 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. 4d 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 4d ago), licensed Apache-2.0. It adds 67 tokens to every session and 724 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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