agent-builder-skill

agent-builder-skill is a skill for Claude Code from zeenie-ai/OpenCompany. It costs 39 tokens per session (2,333 once invoked), scanned A, original, MIT.

A guide to using an Agent Builder canvas, a visual workspace for connecting tools, skills, and helper agents. It explains five operations for inspecting and changing that setup.

In plain words
What is it for?
Use it to inspect the current canvas, add tools or skills, connect helper agents, or modify the current workflow.
Why use it?
It helps an agent understand what is already connected before changing its available tools or helpers. This reduces duplicate connections and unintended changes.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

Good fit Use it to inspect the current canvas, add tools or skills, connect helper agents, or modify the current workflow.

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Install with agentmods
npx agentmods add skills/zeenie-ai/opencompany/agent-builder-skill
About the project

OpenCompany is an application for creating AI employees that work on assigned jobs in the background on the user's computer, using teams of specialized agents coordinated by a lead agent. People connect these employees to tools such as email, calendars, messages, and code, then define their workflows through a visual editor.

zeenie-ai/OpenCompany · 1,039 stars · on GitHub · opencompany.sh

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 zeenie-ai/OpenCompany --skill agent-builder-skill
Clone the repo
git clone --depth 1 https://github.com/zeenie-ai/OpenCompany

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 agent-builder-skill

README.md
[![agentmods](https://agentmods.dev/badge/skills/zeenie-ai/opencompany/agent-builder-skill/github.svg)](https://agentmods.dev/skills/zeenie-ai/opencompany/agent-builder-skill)
Your own site
<a href="https://agentmods.dev/skills/zeenie-ai/opencompany/agent-builder-skill"><img src="https://agentmods.dev/badge/skills/zeenie-ai/opencompany/agent-builder-skill/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 agent-builder-skill

Your own site · 80×15
<a href="https://agentmods.dev/skills/zeenie-ai/opencompany/agent-builder-skill"><img src="https://agentmods.dev/badge/skills/zeenie-ai/opencompany/agent-builder-skill.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 39 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,333 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 $0.00039 $0.02333
Opus 5.5 $0.00016 $0.00933
Sonnet 5.5 $0.00008 $0.00467
Haiku 4.5 $0.00004 $0.00233

Measured 16d ago against content hash 69fb3a5145f5, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

agent-builder-skill 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 16d 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.

server/skills/assistant/agent-builder-skill/SKILL.md · 194 lines

How it starts

The opening of the file, as written. The whole thing — 194 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Agent Builder

You are connected to an Agent Builder node. It gives you ONE tool, agent_builder, with operations chosen by the operation field:

operation What it does
inspect_canvas Read-only: the canvas, what is wired to you, and the catalogue of everything you may add. ALWAYS call this first.
inspect_node Read the live parameter/output schemas, handles, credential requirements, locked fields, availability, and related documentation for a node ID or type.
search_docs Search shipped node logic flows, plugin Markdown, skills, guides, RFCs, and project documentation.
read_doc Read a bounded section by manifest document ID; follow the returned relative links by document ID.
add_tool Wire a tool to you (node_type from available_tools).
add_skill Give you a skill (skill_name from available_skills).
add_subagent Team leads only: add a teammate (agent_type from available_agents).
plan_update Validate a complete scoped change and report required owner access without mutating the graph.
apply_update Apply the same authorized configuration, or apply saved capabilities at a safe point.
create_workflow Create a fully configured employee team using the shared Hire pipeline, from a trusted owner request.

Every call is agent_builder({operation: "<one of the above>", ...fields}).

The cardinal rule

Call agent_builder({operation: "inspect_canvas"}) before any change. Inspect relevant capabilities with inspect_node, then search and read their documentation before planning configuration or wiring. Live schemas, handles, locked fields and availability override conflicting prose. Archived documents are historical context. Document IDs are manifest identifiers, never arbitrary paths; continue long reads with next_offset. Documentation describes access requirements; it does not authorize gaining access. Pick values only from its catalogues: available_tools[].type, available_skills[].name, available_agents[].type. Never guess one.

Read the full file on GitHub · 194 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. 16d ago Changed · +1 lines 69fb3a5145f5
  2. 20d ago Changed · +19 lines 41b9b5dce62a
  3. 21d ago Changed · +32 lines 08255f966c32
  4. 27d ago Changed · -54 lines · +4 tokens per session bf02b87ef0a9
  5. 1mo ago First seen · 196 lines · 35 tokens per session scan A f2685b7ef8be

Subscribe to this mod's changes

agent-builder-skill is a skill published in the GitHub repository zeenie-ai/OpenCompany (1,039 stars, last pushed 4d ago), licensed MIT. It adds 39 tokens to every session and 2,333 once invoked, about $0.0002 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.