deep-dive

An agent for detailed investigation of code, system structure, bugs, performance issues, security concerns, and technical options.

In plain words
What is it for?
Use it to analyse an unfamiliar codebase, compare designs, investigate bugs or slow code, review plans, or explore security issues.
Why use it?
It helps examine complicated or unfamiliar technical problems before deciding what to change.

Agent for Claude Code

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 agents/leonvanzyl/agentic-coding-starter-kit/deep-dive
Clone the repo
git clone --depth 1 https://github.com/leonvanzyl/agentic-coding-starter-kit

Made for: Claude Code.

Per session 535 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,609 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin unknown 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 $0.00535 $0.01609
Opus 5 $0.00267 $0.00805
Sonnet 5 $0.00107 $0.00322
Haiku 4.5 $0.00053 $0.00161

Measured 2d ago against content hash e6427ffd673d, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

deep-dive 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.

.claude/agents/deep-dive.md · 134 lines

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.

Read it on GitHub

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. 2d ago First seen · 134 lines · 535 tokens per session scan A e6427ffd673d

Subscribe to this mod's changes

deep-dive is an agent published in the GitHub repository leonvanzyl/agentic-coding-starter-kit (436 stars, last pushed 3mo ago), with no licence file. It adds 535 tokens to every session and 1,609 once invoked, about $0.0027 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.