service-deep-dive

A command for examining one important service, module, application, worker, or package from its entry points through its dependencies and runtime behavior. A worker is a background process that performs tasks outside a user request.

In plain words
What is it for?
Use it to document entry points, dependencies, APIs, messages, events, runtime settings, and risk areas for one selected part of a system.
Why use it?
It provides a focused view when a whole-repository map is too broad. It gathers the facts needed to understand how one code area works and where it may be risky.

Command 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 commands/syz-coder/codebase-knowledge-wiki/service-deep-dive
Clone the repo
git clone --depth 1 https://github.com/SYZ-Coder/codebase-knowledge-wiki

Made for: Claude Code.

Per session 20 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 286 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 $0.00020 $0.00286
Opus 5 $0.00010 $0.00143
Sonnet 5 $0.00004 $0.00057
Haiku 4.5 $0.00002 $0.00029

Measured 2d ago against content hash 9fde767aba9b, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

service-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/commands/service-deep-dive.md · 29 lines

What it actually says

Use the backend service spec skill as the primary workflow.

Read the skill source from the first available location:

  • .claude/skills/backend-service-spec-skill/SKILL.md
  • skills/backend-service-spec-skill/SKILL.md
  • ai-skill-lib/backend-service-spec-skill/SKILL.md
  • backend-service-spec-skill/SKILL.md

If the target is mobile, H5, frontend, Python, or mixed-stack, also read the cross-tech-stack extension from the first available location:

  • .claude/skills/cross-tech-stack-spec-skill/SKILL.md
  • skills/cross-tech-stack-spec-skill/SKILL.md
  • ai-skill-lib/cross-tech-stack-spec-skill/SKILL.md
  • cross-tech-stack-spec-skill/SKILL.md

Then execute the service_deep_dive workflow for:

$ARGUMENTS

Generate service or module artifacts under mydocs/services/ or mydocs/modules/ unless the user gives another path. Include entrypoints, dependencies, API or contract facts, MQ/events if present, runtime config, and risk hotspots as evidence allows.

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 · 29 lines · 20 tokens per session scan A 9fde767aba9b

Subscribe to this mod's changes

service-deep-dive is a command published in the GitHub repository SYZ-Coder/codebase-knowledge-wiki (9 stars, last pushed 2mo ago), licensed MIT. It adds 20 tokens to every session and 286 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 2026-08-31.