What is lobu-builder?

A guide for changing an agent project made with Lobu, a tool for building agents from configuration files, prompts, connections, and skills. It explains which project files to inspect and edit.

Use it when editing Lobu agents, their instructions, settings, connected services, local skills, or evaluation files.

It helps keep changes consistent with the project’s existing structure and checks whether the agent remains runnable.

lobu-builder — Skill for Codex by lobu-ai

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 lobu-ai/lobu --skill lobu-builder

Clone the repo

git clone --depth 1 https://github.com/lobu-ai/lobu

Made for: 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/lobu-ai/lobu/lobu-builder/github.svg)](https://agentmods.dev/skills/lobu-ai/lobu/lobu-builder)

Your own site

<a href="https://agentmods.dev/skills/lobu-ai/lobu/lobu-builder"><img src="https://agentmods.dev/badge/skills/lobu-ai/lobu/lobu-builder/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/lobu-ai/lobu/lobu-builder"><img src="https://agentmods.dev/badge/skills/lobu-ai/lobu/lobu-builder.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 76 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 972 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: 5 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 MCP Rug Pull · line 38
npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.

Fix: Pin the version: npx @scope/[email protected]
medium MCP Rug Pull · line 40
npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.

Fix: Pin the version: npx @scope/[email protected]
medium MCP Rug Pull · line 41
npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.

Fix: Pin the version: npx @scope/[email protected]
medium MCP Rug Pull · line 42
npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.

Fix: Pin the version: npx @scope/[email protected]
medium MCP Rug Pull · line 57
npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.

Fix: Pin the version: npx @scope/[email protected]

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.

Model	Per session	Once invoked
Fable 5.1	$0.00076	$0.00972
Opus 5	$0.00038	$0.00486
Sonnet 5	$0.00015	$0.00194
Haiku 4.5	$0.00008	$0.00097

Measured 11d ago against content hash 141b429273e9, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

lobu-builder 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 11d 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.

codex-skills/lobu-builder/SKILL.md · 73 lines

How it starts

The opening of the file, as written. The whole thing — 73 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Lobu Builder

Overview

Use this skill when the repository is a Lobu project and the task is to build or change the agent itself: prompt files, lobu.config.ts, local skills, MCP configuration, connections, network settings, or evals.

If you are inside the Lobu monorepo rather than a generated Lobu project, follow that repository's own instructions first.

First Pass

Read AGENTS.md first. If it redirects to another file such as @TESTING.md, open that too.
Read lobu.config.ts. It is TypeScript: defineConfig from @lobu/cli/config is the default export.
Enumerate agent directories under agents/ and inspect the target agent's IDENTITY.md, SOUL.md, and USER.md.
Check whether the repo has shared skills/ or agent-local agents/<id>/skills/.
Look for evals under agents/<id>/evals/promptfooconfig.yaml (the project may also have legacy YAML files — those don't run).

Do not assume there is only one agent or one platform connection.

What To Edit

IDENTITY.md: who the agent is
SOUL.md: rules, workflows, guardrails
USER.md: user or tenant context
lobu.config.ts: providers, connections, enabled skills, MCP servers, network allowlist (authored with define* from @lobu/cli/config)
skills/.../SKILL.md: shared reusable capabilities
agents/<id>/skills/.../SKILL.md: agent-specific capabilities
agents/<id>/evals/promptfooconfig.yaml: promptfoo eval suite (runs via bunx promptfoo eval with @lobu/promptfoo-provider)

Prefer editing these files directly instead of burying semantics in ad hoc code.

Workflow

Keep the project runnable. Start or reuse the stack with npx @lobu/cli@latest run -d.
Make the smallest prompt, config, skill, or eval change that solves the task.
Run npx @lobu/cli@latest validate after changing lobu.config.ts or skill definitions.
Test semantics with npx @lobu/cli@latest chat "..." or the project's testing instructions.
Run LOBU_TOKEN=$(npx @lobu/cli@latest token --raw) bunx promptfoo eval -c agents/<id>/evals/promptfooconfig.yaml when the expected result should be captured as a regression test.

Read the full file on GitHub · 73 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.

agents/openai.yaml 309 B

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.

11d ago First seen · 73 lines · 76 tokens per session scan A 141b429273e9

Subscribe to this mod's changes

lobu-builder is a skill published in the GitHub repository lobu-ai/lobu (219 stars, last pushed yesterday), licensed Apache-2.0. It adds 76 tokens to every session and 972 once invoked, about $0.0004 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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