custom_tool_builder_guide

custom_tool_builder_guide is a skill for Claude Code, Codex from siddsachar/row-bot. It costs 18 tokens per session (483 once invoked), scanned A, original, Apache-2.0.

Guidance for turning a GitHub repository, local folder, or current project into a reusable custom tool.

In plain words
What is it for?
It helps draft and refine a tool, set up Python dependencies, run a smoke test, create it after approval, and enable or promote it.
Why use it?
It helps organise the import, setup, testing, creation, and availability steps instead of requiring manual configuration files.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/siddsachar/row-bot/custom_tool_builder_guide
Any agent
npx skills add siddsachar/row-bot --skill custom_tool_builder_guide
Clone the repo
git clone --depth 1 https://github.com/siddsachar/row-bot

Made for: Claude Code, Codex.

Per session 18 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 483 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00018 $0.00483
Opus 5 $0.00009 $0.00242
Sonnet 5 $0.00004 $0.00097
Haiku 4.5 $0.00002 $0.00048

Measured 3d ago against content hash 203e01781ee4, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

custom_tool_builder_guide 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.

tool_guides/custom_tool_builder_guide/SKILL.md · 36 lines

What it actually says

Custom Tool Builder Guide

Use custom_tool_builder when the user asks to turn a GitHub repo, local folder, or current project into a reusable Row-Bot Custom Tool.

Default flow:

  1. Start with action="start".
  2. For a repo URL, pass source_url. If the user gave a clone parent, pass fields={"clone_parent": "..."}. If no clone parent is known, ask for one.
  3. Show the proposed tool name, warnings, and commands before creating anything.
  4. Use action="refine" when the user asks to adjust commands or behavior.
  5. Use action="test" for a smoke test when requested.
  6. For Python repos with missing dependencies, use action="setup" to create/reuse the tool folder's .venv and install dependencies there.
  7. Use action="create" only after the user accepts the draft.
  8. Use action="enable" for Developer availability and action="promote" only when the user explicitly wants it available in normal chat/workflows.

Rules:

  • Do not ask the user to hand-write row-bot-custom-tool.json or internal config files.
  • Use custom_tool_builder for lifecycle state: clone/import source, draft, refine, create, enable, promote, delete.
  • Use custom_tool_builder action="setup" for Python dependency setup. Do not run pip install manually in Row-Bot's own Python environment.
  • Shell can help with extra read-only inspection or explicit user-approved command testing when the builder needs more evidence.
  • Do not use shell to manually register, enable, promote, delete, or edit Custom Tool metadata.
  • Public repo Custom Tools do not have a separate hidden enablement gate. Safety comes from explicit clone destination, command review, test approval/sandboxing, and the separate enable/promote steps.
  • Explain that generated commands usually operate on the cloned/local repo files unless a command is clearly network-enabled.
  • Removing a Custom Tool should preserve source files unless the user explicitly asks to delete managed files.
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. 3d ago First seen · 36 lines · 18 tokens per session scan A 203e01781ee4

Subscribe to this mod's changes

custom_tool_builder_guide is a skill published in the GitHub repository siddsachar/row-bot (1,479 stars, last pushed 5d ago), licensed Apache-2.0. It adds 18 tokens to every session and 483 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 2026-08-30.

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