add-behavior

add-behavior is a skill for Claude Code from jmagly/aiwg. It costs 25 tokens per session (1,600 once invoked), scanned A, original, MIT.

A scaffolding tool that creates a new behavior definition with a BEHAVIOR.md file and optional scripts. Behaviors are reactive rules that connect instructions and tools to particular agent contexts.

In plain words
What is it for?
Use it to add behaviors triggered by contexts such as saving a file, including optional hooks, scripts, and inputs.
Why use it?
It gives a behavior a standard structure instead of requiring each file and script to be created manually.

Skill for Claude Code

Written for Claude Code: $ARGUMENTS substitution. Also seen: built for openclaw.

Good fit Use it to add behaviors triggered by contexts such as saving a file, including optional hooks, scripts, and inputs.

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Install with agentmods
npx agentmods add skills/jmagly/aiwg/add-behavior
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 jmagly/aiwg --skill add-behavior
Clone the repo
git clone --depth 1 https://github.com/jmagly/aiwg

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-behavior

README.md
[![agentmods](https://agentmods.dev/badge/skills/jmagly/aiwg/add-behavior/github.svg)](https://agentmods.dev/skills/jmagly/aiwg/add-behavior)
Your own site
<a href="https://agentmods.dev/skills/jmagly/aiwg/add-behavior"><img src="https://agentmods.dev/badge/skills/jmagly/aiwg/add-behavior/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-behavior

Your own site · 80×15
<a href="https://agentmods.dev/skills/jmagly/aiwg/add-behavior"><img src="https://agentmods.dev/badge/skills/jmagly/aiwg/add-behavior.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 25 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,600 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 warn 7 Sept 2026
SkillSpector: 2 findings, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • medium Rogue Agent · line 136
    Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.
    Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
  • medium Agent Snooping · line 234
    Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.
    Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
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 $0.00025 $0.01600
Opus 5 $0.00013 $0.00800
Sonnet 5 $0.00005 $0.00320
Haiku 4.5 $0.00003 $0.00160

Measured 9d ago against content hash 27ba061cc028, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

add-behavior 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 9d 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.

agentic/code/addons/aiwg-utils/skills/add-behavior/SKILL.md · 235 lines

How it starts

The opening of the file, as written. The whole thing — 235 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Add Behavior

Scaffold a new behavior definition with BEHAVIOR.md and optional scripts and inputs inside an existing addon or framework.

Triggers

Alternate expressions and non-obvious activations (primary phrases are matched automatically from the skill description):

  • "I need a new behavior" → scaffold behavior in specified target
  • "create a reactive behavior" → prompt for name and target, scaffold
  • "add a hook-based behavior" → scaffold with scripts directory
  • "behavior for X context" → derive name, prompt for target

Trigger Patterns Reference

Pattern Example Action
Named add "add behavior auto-lint --to aiwg-utils" Scaffold directly
Description-driven "create a behavior that triggers on file save" Derive name, prompt target
Interactive "add behavior --interactive --to sdlc-complete" Guided design mode
Target omitted "add behavior my-behavior" Ask which addon or framework

Understanding Behaviors

Behaviors are the newest AIWG artifact type. They bind reactive directives and toolsets to specific agent contexts. Unlike skills (which activate on natural language patterns) or commands (which require explicit invocation), behaviors:

  • React to events — file saves, session starts, code changes, tool completions
  • Bind to contexts — specific file types, project states, or agent sessions
  • Execute automatically — no user invocation needed once activated
  • Compose with tools — can bundle external scripts and structured inputs

Behaviors deploy primarily to OpenClaw (~/.openclaw/behaviors/) and are defined using the cross-platform BEHAVIOR.md format.

Process

1. Parse Arguments

Extract from $ARGUMENTS:

  • <name> — kebab-case behavior name (required)
  • --to <target> — addon or framework directory name (required)
  • --interactive — enable guided design questions

If either <name> or --to is missing, ask before proceeding.

2. Validate Target

Confirm the target exists:

Read the full file on GitHub · 235 lines

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. 9d ago First seen · 235 lines · 25 tokens per session scan A 27ba061cc028

Subscribe to this mod's changes

add-behavior is a skill published in the GitHub repository jmagly/aiwg (211 stars, last pushed yesterday), licensed MIT. It adds 25 tokens to every session and 1,600 once invoked, about $0.0001 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 2026-09-03.