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 agentmods add skills/desirecore/market/update-agentnpx skills add desirecore/market --skill update-agentgit clone --depth 1 https://github.com/desirecore/marketWrote 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/desirecore/market/update-agent)<a href="https://agentmods.dev/skills/desirecore/market/update-agent"><img src="https://agentmods.dev/badge/skills/desirecore/market/update-agent.svg" alt="Measured on agentmods" 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 | $0.00062 | $0.02839 |
| Opus 5 | $0.00031 | $0.01419 |
| Sonnet 5 | $0.00012 | $0.00568 |
| Haiku 4.5 | $0.00006 | $0.00284 |
Grade A, and why
update-agent 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 3d 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 — 170 lines — stays where its author put it; the contents beside it link to each section on GitHub.
update-agent skill
L0: One-Sentence Summary
Safely modify an Agent's configuration, persona, rules, and skills through natural-language conversation.
L1: Overview
Meta-skill: recognize the edit intent → generate a reviewable diff → user confirmation → apply (structured fields via ManageAgent, free-form files via Read/Write) → receipt. Use it to adjust communication style, add/change behavior rules, install/uninstall skills, or batch-upgrade config. The agent directory is version-managed by git with a traceable history, so rollback is supported. Its value is what the tool can't give: diff preview confirmation, two-path orchestration, version rollback; structured fields go through ManageAgent's whitelist + schema validation so invalid config never lands.
L2: Detailed Spec
Update Types and the Two Paths
Structured fields always go through ManageAgent(action='update') (whitelist + validation + merge semantics); free-form files (memory/skills/tools) are edited directly with Read/Write:
| User intent | Means | Target (risk) |
|---|---|---|
| Rename (display name) | ManageAgent(update, name=...) |
agent.json (med) |
| Change description | ManageAgent(update, description=...) |
agent.json (low) |
| Default reasoning/retry config | ManageAgent(update, config={llm:{...}}) |
agent.json (med) |
| Declarative avatar | ManageAgent(update, config={avatar:{...}}) |
agent.json (low) |
| Image avatar | ManageAgent(update, avatarImage={...}) |
avatar (med) |
| Personality/style | ManageAgent(update, persona=... or markdown) |
persona.md (med) |
| Behavior rules | ManageAgent(update, principles=... or markdown) |
principles.md (high) |
| Install/uninstall skill | Read/Write | skills/ (low/med) |
| Add memory | Read/Write | memory/ (low) |
| Change tool config | Read/Write | tools/ (high, watch protected paths) |
Flow: intent recognition → change analysis → diff generation → user confirmation → apply → receipt.
Stage 1: Intent Recognition
What ships with it
2 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.
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.
- 3d ago First seen · 170 lines · 62 tokens per session scan A 00b7b69c579f
update-agent is a skill published in the GitHub repository desirecore/market (2 stars, last pushed 4d ago), licensed MIT. It adds 62 tokens to every session and 2,839 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 2026-08-31.
Other skills, from other repositories
skill-authoring
Author SKILL.md skills: frontmatter, validator limits, structure.
a0-plugin-router
Main entry point for all Agent Zero plugin tasks. Routes to specialist skills for creating, reviewing, contributing, managing, or debugging plugins. Use when the user mentions plugins, asks how the plugin system works, wants to build/install/uninstall/publish/debug a plugin, or asks about the Plugin Hub.
a0-manage-plugin
Manage Agent Zero plugins lifecycle: browse the Plugin Hub, scan for security, install from Git/ZIP/Plugin Hub, update, uninstall, enable, disable, debug, and troubleshoot. Use when asked to install, update, uninstall, remove, scan, find, search, enable, disable, debug, or troubleshoot a plugin.
a0-plugin-router
Main entry point for all Agent Zero plugin tasks. Routes to specialist skills for creating, reviewing, contributing, managing, or debugging plugins. Use when the user mentions plugins, asks how the plugin system works, wants to build/install/uninstall/publish/debug a plugin, or asks about the Plugin Hub.
create-skill
Wizard for creating new Agent Zero skills. Guides users through creating well-structured SKILL.md files. Use when users want to create custom skills.
agentskills-usage
Teaches AI agents how to use the AgentSkills Registry CLI to search, pull, and push skill bundles.