cmdb-patterns

A set of patterns for managing configuration items and their relationships in ServiceNow's CMDB. A configuration item is a tracked technology or service, such as a server, application, database, or business service.

In plain words
What is it for?
Use it to create and classify configuration items, connect upstream and downstream relationships, trace impact, find orphaned or outdated records, and match discovered items to the right class hierarchy.
Why use it?
It helps keep the CMDB accurate and structured, making it easier to understand what depends on what and what could be affected by a change.

Skill for Claude CodeCodex

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/serac-labs/serac/cmdb-patterns
Any agent
npx skills add serac-labs/serac --skill cmdb-patterns
Clone the repo
git clone --depth 1 https://github.com/serac-labs/serac

Made for: Claude Code, Codex.

Per session 43 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,624 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 $0.00043 $0.03624
Opus 5 $0.00022 $0.01812
Sonnet 5 $0.00009 $0.00725
Haiku 4.5 $0.00004 $0.00362

Measured 2d ago against content hash e9ad2560e99b, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

cmdb-patterns 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.

packages/skills/cmdb-patterns/SKILL.md · 464 lines

How it starts

The opening of the file, as written. The whole thing — 464 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CMDB Patterns for ServiceNow

The Configuration Management Database (CMDB) is the foundation of ServiceNow ITSM, tracking all Configuration Items (CIs) and their relationships.

CMDB Architecture

CI Class Hierarchy

cmdb (Base)
└── cmdb_ci (Configuration Item)
    ├── cmdb_ci_computer
    │   ├── cmdb_ci_server
    │   │   ├── cmdb_ci_linux_server
    │   │   ├── cmdb_ci_win_server
    │   │   └── cmdb_ci_unix_server
    │   └── cmdb_ci_pc_hardware
    ├── cmdb_ci_service
    │   ├── cmdb_ci_service_business
    │   ├── cmdb_ci_service_technical
    │   └── cmdb_ci_service_auto
    │       └── cmdb_ci_service_discovered
    ├── cmdb_ci_appl
    │   ├── cmdb_ci_app_server
    │   └── cmdb_ci_db_instance
    └── cmdb_ci_network_gear
        ├── cmdb_ci_netgear
        └── cmdb_ci_lb

Key CI Tables

Table Purpose Key Fields
cmdb_ci Base CI table name, sys_class_name, operational_status
cmdb_ci_server Servers ip_address, os, cpu_count, ram
cmdb_ci_service Service (base class — Business Service is cmdb_ci_service_business) service_classification, busines_criticality
cmdb_ci_appl Applications version, install_directory
cmdb_rel_ci CI Relationships parent, child, type

Creating Configuration Items

Basic CI Creation (ES5)

// Create a new server CI
var ci = new GlideRecord("cmdb_ci_server")
ci.initialize()
ci.setValue("name", "PROD-WEB-001")
ci.setValue("ip_address", "10.0.1.100")
ci.setValue("os", "Linux Red Hat")
ci.setValue("os_version", "8.5")
ci.setValue("cpu_count", 8)
ci.setValue("ram", 32768)
ci.setValue("operational_status", 1) // Operational
ci.setValue("install_status", 1) // Installed
ci.setValue("used_for", "Production")
ci.setValue("owned_by", "sys_id_of_owner")
ci.setValue("support_group", "sys_id_of_group")
var sysId = ci.insert()

Read the full file on GitHub · 464 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. 2d ago First seen · 464 lines · 43 tokens per session scan A e9ad2560e99b

Subscribe to this mod's changes

cmdb-patterns is a skill published in the GitHub repository serac-labs/serac (78 stars, last pushed 7d ago), licensed Apache-2.0. It adds 43 tokens to every session and 3,624 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 2026-08-30.

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