dive-deeper

dive-deeper is a skill for Claude Code, Codex from jmstajim/dive-deeper-plugin. It costs 39 tokens per session (801 once invoked), scanned A, original, MIT.

A deep codebase investigation process that traces how a change moves through the program and identifies related code, edge cases, and risks.

In plain words
What is it for?
It is for examining call sites, following dependency chains, checking implementations and tests, mapping a change's impact, and surfacing unclear assumptions or potential problems.
Why use it?
It reduces the chance of missing callers, dependencies, shared state, or affected tests when analysing a change.

Skill for Claude CodeCodex

Part of the dive-deeper plugin — 1 skill shipped together

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/jmstajim/dive-deeper-plugin/dive-deeper
Any agent
npx skills add jmstajim/dive-deeper-plugin --skill dive-deeper
Clone the repo
git clone --depth 1 https://github.com/jmstajim/dive-deeper-plugin

Made for: Claude Code, Codex.

Or install dive-deeper, the plugin that ships this one along with the rest of its 1 skill.

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 dive-deeper

README.md
[![agentmods](https://agentmods.dev/badge/skills/jmstajim/dive-deeper-plugin/dive-deeper.svg)](https://agentmods.dev/skills/jmstajim/dive-deeper-plugin/dive-deeper)
Your own site
<a href="https://agentmods.dev/skills/jmstajim/dive-deeper-plugin/dive-deeper"><img src="https://agentmods.dev/badge/skills/jmstajim/dive-deeper-plugin/dive-deeper.svg" alt="Measured on agentmods" 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 801 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 $0.00039 $0.00801
Opus 5 $0.00019 $0.00400
Sonnet 5 $0.00008 $0.00160
Haiku 4.5 $0.00004 $0.00080

Measured 4d ago against content hash cc86de658ade, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

dive-deeper 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 4d 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.

skills/dive-deeper/SKILL.md · 75 lines

How it starts

The opening of the file, as written. The whole thing — 75 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Dive Deeper

The user feels the current analysis is incomplete — blind spots, unexplored paths, or risks that haven't been considered. Your job is to find them.

How to work

Actually search the codebase — don't reason from memory. Use Grep to find call sites, Glob to find related files, Read to examine implementations. Every claim ("this function is called from 3 places") must be backed by a tool call. If you haven't grepped for it, you don't know it.

If something is unclear — the intent behind the change, which behavior is expected, or how a component is supposed to work — ask the user before guessing. A wrong assumption baked into the analysis is worse than no analysis. Keep questions focused and specific.

What to do

1. Map the blast radius

Start from the function/type/file at the center of the change. Trace outward:

  • Who calls this? Grep for all call sites — not just the obvious ones. Check tests, UI bindings, interface implementations, closures, dependency injection.
  • Who does this call? Follow the dependency chain down. If you're changing a service, what does it depend on? Could those break?
  • Who shares data with this? Look for shared state — globals, singletons, injected objects, config keys, file paths, notification/event names.

Build a concrete list of affected files with line numbers. Not "this might affect some views" — name them.

2. Trace the full flow

Pick the most important user-facing scenario that touches this code. Walk through it step by step:

  • What triggers it?
  • What state must exist before it works?
  • What state does it leave behind after?
  • What happens if it's interrupted halfway (process killed, network lost, concurrent call)?

If the change touches multiple flows, trace each one. Don't say "this could be a problem" — show the specific sequence of events that leads to failure.

3. Surface edge cases

Think about the inputs and states the original plan didn't consider:

  • Empty/nil/zero: Empty collection? Nil value? Zero count?
  • Boundaries: First item, last item, single item, maximum allowed.
  • Concurrency & reentrancy: Can two callers hit this simultaneously? Can it be called while already running?
  • Migration: Does this change the shape of persisted data? What happens to existing data?
  • Partial failure: If this fails halfway, is the state consistent or half-updated?

Read the full file on GitHub · 75 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. 4d ago First seen · 75 lines · 39 tokens per session scan A cc86de658ade

Subscribe to this mod's changes

dive-deeper is a skill published in the GitHub repository jmstajim/dive-deeper-plugin (2 stars, last pushed 5mo ago), licensed MIT. It adds 39 tokens to every session and 801 once invoked, about $0.0002 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 2026-08-31.

Related

Other skills, from other repositories

watch

Watch live IDX turnover and order books for unusual activity — value surges, auto-reject approach, one-sided depth, walls appearing or withdrawn, quiet stocks waking up, UMA flags — plus delayed print-by-print attribution and end-of-day broker context. Use when the user runs /watch, or asks what is trading right now…

INo-xious/stockbit-mcp · 88 tokens

stockbit-status

Check whether the Stockbit session is still valid — main session expiry, whether trading credentials are stored, and the current trading mode. Use when the user asks "am I still logged in to Stockbit", "has my session expired", "is trading on", or when a stockbit MCP tool starts failing with an auth error.

INo-xious/stockbit-mcp · 70 tokens

stockbit-auth

Log in to Stockbit and capture the session for this server — opens the browser login flow and verifies the token was stored. Use when the user asks to log in or re-authenticate to Stockbit, or after a status check reports the session expired, HTTP 401, or logged out.

INo-xious/stockbit-mcp · 63 tokens

recursive-decomposition

Handle tasks that exceed the context window by decomposing them: size and filter the input, chunk it, run recursive sub-agents on independent parts, verify on small windows, and synthesise programmatically, following the Recursive Language Models (RLM) research by Zhang, Kraska and Khattab (2025). Use when a task…

massimodeluisa/recursive-decomposition-skill · 151 tokens

bandar-check

Answer "who is accumulating this stock?" for an IDX ticker using Stockbit broker-flow data. Use when the user asks about bandar, big money, accumulation, distribution, foreign flow, asing, or who is on the other side of the tape.

INo-xious/stockbit-mcp · 54 tokens

trade-with-guardrails

Place an order through the user's own Stockbit account safely — check the mode, size the position from a risk budget, preview, read the summary back to the human, and only then write. Use when the user asks to buy, sell, amend or cancel an order, or to size a trade.

INo-xious/stockbit-mcp · 67 tokens