research_codebase_nt

research_codebase_nt is a command for Claude Code from jeffh/claude-plugins. It costs 9 tokens per session (2,039 once invoked), scanned A, a copy of research_codebase_nt, Apache-2.0.

A read-only codebase research command that documents how an existing software project is structured and works.

In plain words
What is it for?
Use it to answer questions about files, components, data flow, and how parts of the code interact.
Why use it?
It gives you a map of the current system without mixing in recommendations, refactoring, or criticism.

Command for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter; mentions subagents; names the TodoWrite tool.

Part of the humanlayer plugin — 2 skills, 27 commands, 6 agents shipped together

Good fit Use it to answer questions about files, components, data flow, and how parts of the code interact.

Compare 6 commands from other repositories ↓
Install with agentmods
npx agentmods add commands/jeffh/claude-plugins/research_codebase_nt
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.

Clone the repo
git clone --depth 1 https://github.com/jeffh/claude-plugins

Made for: Claude Code.

Or install humanlayer, the plugin that ships this one along with the rest of its 2 skills, 27 commands, 6 agents.

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 research_codebase_nt

README.md
[![agentmods](https://agentmods.dev/badge/commands/jeffh/claude-plugins/research_codebase_nt/github.svg)](https://agentmods.dev/commands/jeffh/claude-plugins/research_codebase_nt)
Your own site
<a href="https://agentmods.dev/commands/jeffh/claude-plugins/research_codebase_nt"><img src="https://agentmods.dev/badge/commands/jeffh/claude-plugins/research_codebase_nt/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 research_codebase_nt

Your own site · 80×15
<a href="https://agentmods.dev/commands/jeffh/claude-plugins/research_codebase_nt"><img src="https://agentmods.dev/badge/commands/jeffh/claude-plugins/research_codebase_nt.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 9 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,039 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.
Origin 100% copy Near-identical to another mod 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 $0.00009 $0.02039
Opus 5.5 $0.00004 $0.00816
Sonnet 5.5 $0.00002 $0.00408
Haiku 4.5 $0.00001 $0.00204

Measured 1mo ago against content hash 8787acb059e5, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

research_codebase_nt 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 1mo 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.

Origin

This is a copy

100% identical to research_codebase_nt — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

humanlayer/commands/research_codebase_nt.md · 191 lines

How it starts

The opening of the file, as written. The whole thing — 191 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Research Codebase

You are tasked with conducting comprehensive research across the codebase to answer user questions by spawning parallel sub-agents and synthesizing their findings.

CRITICAL: YOUR ONLY JOB IS TO DOCUMENT AND EXPLAIN THE CODEBASE AS IT EXISTS TODAY

  • DO NOT suggest improvements or changes unless the user explicitly asks for them
  • DO NOT perform root cause analysis unless the user explicitly asks for them
  • DO NOT propose future enhancements unless the user explicitly asks for them
  • DO NOT critique the implementation or identify problems
  • DO NOT recommend refactoring, optimization, or architectural changes
  • ONLY describe what exists, where it exists, how it works, and how components interact
  • You are creating a technical map/documentation of the existing system

Initial Setup:

When this command is invoked, respond with:

I'm ready to research the codebase. Please provide your research question or area of interest, and I'll analyze it thoroughly by exploring relevant components and connections.

Then wait for the user's research query.

Steps to follow after receiving the research query:

  1. Read any directly mentioned files first:

    • If the user mentions specific files (tickets, docs, JSON), read them FULLY first
    • IMPORTANT: Use the Read tool WITHOUT limit/offset parameters to read entire files
    • CRITICAL: Read these files yourself in the main context before spawning any sub-tasks
    • This ensures you have full context before decomposing the research
  2. Analyze and decompose the research question:

    • Break down the user's query into composable research areas
    • Take time to ultrathink about the underlying patterns, connections, and architectural implications the user might be seeking
    • Identify specific components, patterns, or concepts to investigate
    • Create a research plan using TodoWrite to track all subtasks
    • Consider which directories, files, or architectural patterns are relevant

Read the full file on GitHub · 191 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. 1mo ago First seen · 191 lines · 9 tokens per session scan A 8787acb059e5

Subscribe to this mod's changes

research_codebase_nt is a command published in the GitHub repository jeffh/claude-plugins (12 stars, last pushed 10d ago), licensed Apache-2.0. It adds 9 tokens to every session and 2,039 once invoked, about $0.0000 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 100% identical to research_codebase_nt, differing in 0 lines, and is treated as a copy.