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/agent0ai/agent-zero/a0-developmentnpx skills add agent0ai/agent-zero --skill a0-developmentgit clone --depth 1 https://github.com/agent0ai/agent-zeroWhat 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 | $0.00057 | $0.01048 |
| Opus 5 | $0.00028 | $0.00524 |
| Sonnet 5 | $0.00011 | $0.00210 |
| Haiku 4.5 | $0.00006 | $0.00105 |
Grade A, and why
a0-development 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 2d 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.
The source is not reproduced here
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
What ships with it
9 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.
- AGENTS.md 1.6 KB
- references/agents-prompts-skills-projects.md 4.6 KB
- references/AGENTS.md 1.8 KB
- references/api-webui.md 3.2 KB
- references/architecture-runtime.md 4.0 KB
- references/dox-workflow.md 2.8 KB
- references/extensions.md 4.5 KB
- references/plugins-workflow.md 3.5 KB
- references/tools.md 3.1 KB
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.
- 2d ago First seen · 81 lines · 57 tokens per session scan A a2e5d11068cb
a0-development is a skill published in the GitHub repository agent0ai/agent-zero (19,028 stars, last pushed 5d ago), with no licence file. It adds 57 tokens to every session and 1,048 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.
Other skills, from other repositories
a0-development
Development guide for extending and building features for the Agent Zero AI framework. Covers architecture, tools, extensions, API endpoints, agent profiles, projects, prompts, and skills — with correct paths, imports, and patterns matching the current codebase.
frontmcp-development
Use when building any FrontMCP server component other than a tool (for tools, use create-tool). Covers @Resource static resources and parameterized URI templates; @Prompt reusable prompts (RAG, multi-turn); @Provider singleton dependency-injection providers (database pools, API clients); @Agent autonomous LLM agents…
composio
Use 1000+ external apps via Composio - either directly through the CLI or by building AI agents and apps with the SDK.
agent-development
This skill should be used when the user asks to "create an agent", "add an agent", "write a subagent", "agent frontmatter", "when to use description", "agent examples", "agent tools", "agent colors", "autonomous agent", or needs guidance on agent structure, system prompts, triggering conditions, or agent development…
skill-creator
Create or improve Zhin Agent skills (SKILL.md). Use when asked to add a skill, write SKILL.md, document a repeatable agent workflow, or refine skill frontmatter/keywords. Triggers: 创建技能, 写 SKILL, skill-creator, 加 skill.
holix-extensions
Author and manage Holix agent drop-in extensions so the agent can extend itself without editing Holix core. Use when the user asks to write an extension, add tools, register slash commands, list extensions, disable a broken extension, or self-modify agent capabilities. Invoke via /holix-extensions.