service-mapper

service-mapper is a skill for Claude Code, Codex from OneDro1d/dark-factory. It costs 103 tokens per session (2,132 once invoked), scanned A, original, Apache-2.0.

A codebase analysis that documents services, the separate deployable parts of an application, their communication, database ownership, external integrations, and event flows. It produces structured Markdown for developers and coding agents.

In plain words
What is it for?
Use it when onboarding, planning features, auditing service ownership, updating CLAUDE.md or SERVICE-MAP.md, or checking architecture after a major refactor.
Why use it?
Unfamiliar systems are hard to change safely when their boundaries and dependencies are unclear. A service map shows what exists and helps expose architectural problems such as shared databases or forbidden direct connections.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: mentions CLAUDE.md.

Good fit Use it when onboarding, planning features, auditing service ownership, updating CLAUDE.md or SERVICE-MAP.md, or checking architecture after a major refactor.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/onedro1d/dark-factory/service-mapper
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.

Any agent
npx skills add OneDro1d/dark-factory --skill service-mapper
Clone the repo
git clone --depth 1 https://github.com/OneDro1d/dark-factory

Made for: Claude Code, Codex.

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 service-mapper

README.md
[![agentmods](https://agentmods.dev/badge/skills/onedro1d/dark-factory/service-mapper/github.svg)](https://agentmods.dev/skills/onedro1d/dark-factory/service-mapper)
Your own site
<a href="https://agentmods.dev/skills/onedro1d/dark-factory/service-mapper"><img src="https://agentmods.dev/badge/skills/onedro1d/dark-factory/service-mapper/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 service-mapper

Your own site · 80×15
<a href="https://agentmods.dev/skills/onedro1d/dark-factory/service-mapper"><img src="https://agentmods.dev/badge/skills/onedro1d/dark-factory/service-mapper.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 103 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,132 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00103 $0.02132
Opus 5 $0.00051 $0.01066
Sonnet 5 $0.00021 $0.00426
Haiku 4.5 $0.00010 $0.00213

Measured 9d ago against content hash 6f9d681029fc, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

service-mapper scanned grade A with 1 finding 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 9d 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

grep -rn "axios\|fetch(\|http.Get\|http.Post\|requests.get\|requests.post\|HttpClient" --include="*.ts" --include="*.go" --include="*.py"
skills/service-mapper/SKILL.md · 211 lines

How it starts

The opening of the file, as written. The whole thing — 211 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Service Mapper

Analyze a codebase and produce a structured, AI-agent-friendly service map. The output documents every microservice, how they communicate, what databases and tables they own, and what external systems they integrate with.

When to Use

  • Onboarding to an unfamiliar codebase
  • Generating or updating a CLAUDE.md or SERVICE-MAP.md
  • Before planning a new feature (understand what exists)
  • Auditing service boundaries and ownership
  • Detecting architectural violations (shared DBs, direct HTTP between services, etc.)
  • After significant refactoring to verify the architecture still makes sense

Workflow

Execute these steps in order. Each step builds on the previous.

Step 1: Identify Service Boundaries

Scan the repository structure to find all deployable units (services, workers, lambdas, cron jobs).

What to look for:

Signal Examples
Entrypoints main.go, main.ts, index.ts, app.py, Program.cs, main.rs
Build configs Dockerfile, docker-compose.yaml, serverless.yml, app.yaml
Package manifests package.json, go.mod, Cargo.toml, pom.xml, *.csproj
Deployment specs K8s manifests, Terraform, Helm charts, DO app specs
Monorepo markers packages/, services/, apps/, cmd/, internal/

For each service, record:

  • Name
  • Language / framework
  • Entrypoint file
  • Port (if HTTP)
  • Type: webservice | worker | cron | lambda | gateway

Step 2: Map Inter-Service Communication

For each service, trace how it talks to other services.

Communication patterns to detect:

Pattern How to Find
REST / HTTP Look for HTTP client calls, fetch, axios, http.Get, base URLs pointing to other services
Message bus (RabbitMQ, Kafka, NATS, SQS) Look for publish, subscribe, consume, queue names, exchange declarations, topic subscriptions
gRPC Look for .proto files, gRPC client/server setup, grpc.Dial
Shared library / SDK Look for internal packages imported across services (e.g., DatabaseClient, shared types)
Direct function calls In monoliths or tightly coupled services — function imports across module boundaries
Event contracts Shared schema definitions (Zod, Protobuf, Avro, JSON Schema) that define inter-service messages

Read the full file on GitHub · 211 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 9d ago First seen · 211 lines · 103 tokens per session scan A 6f9d681029fc

Subscribe to this mod's changes

service-mapper is a skill published in the GitHub repository OneDro1d/dark-factory (0 stars, last pushed today), licensed Apache-2.0. It adds 103 tokens to every session and 2,132 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-01.

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