domain

domain is an agent for coding agents from samanhappy/mcphub. It costs 0 tokens per session (382 once invoked), scanned A, a copy of domain, Apache-2.0.

A set of rules for using a repository's domain documentation, meaning its glossary, architecture decisions, and project-specific terms. It tells engineering skills what to read before exploring code.

In plain words
What is it for?
Use it when exploring or changing a codebase, especially when writing issues, refactoring plans, hypotheses, or tests involving project-specific concepts.
Why use it?
It reduces misunderstandings caused by using the wrong terms or overlooking documented design decisions.

Agent

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/samanhappy/mcphub/domain
Clone the repo
git clone --depth 1 https://github.com/samanhappy/mcphub

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 domain

README.md
[![agentmods](https://agentmods.dev/badge/agents/samanhappy/mcphub/domain.svg)](https://agentmods.dev/agents/samanhappy/mcphub/domain)
Your own site
<a href="https://agentmods.dev/agents/samanhappy/mcphub/domain"><img src="https://agentmods.dev/badge/agents/samanhappy/mcphub/domain.svg" alt="Measured on agentmods" height="20"></a>
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 382 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 78% copy Near-identical to another mod 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 $0.00000 $0.00382
Opus 5 $0.00000 $0.00191
Sonnet 5 $0.00000 $0.00076
Haiku 4.5 $0.00000 $0.00038

Measured 4d ago against content hash 211bb8723137, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

domain 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.

Origin

This is a copy

78% identical to domain — 31 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

docs/agents/domain.md · 37 lines

What it actually says

Domain Docs

How the engineering skills should consume this repo's domain documentation when exploring the codebase.

Before exploring, read these

  • CONTEXT.md at the repo root, or
  • CONTEXT-MAP.md at the repo root if it exists — it points at one CONTEXT.md per context. Read each one relevant to the topic.
  • docs/adr/ — read ADRs that touch the area you're about to work in. In multi-context repos, also check src/<context>/docs/adr/ for context-specific decisions.

If any of these files don't exist, proceed silently. Don't flag their absence; don't suggest creating them upfront. The producer skill (/grill-with-docs) creates them lazily when terms or decisions actually get resolved.

File structure

Single-context repo (this repo):

/
├── CONTEXT.md
├── docs/adr/
│   ├── 0001-mcp-server-connection-lifecycle.md
│   └── 0002-dual-datasource-sync.md
└── src/

Use the glossary's vocabulary

When your output names a domain concept (in an issue title, a refactor proposal, a hypothesis, a test name), use the term as defined in CONTEXT.md. Don't drift to synonyms the glossary explicitly avoids.

If the concept you need isn't in the glossary yet, that's a signal — either you're inventing language the project doesn't use (reconsider) or there's a real gap (note it for /grill-with-docs).

Flag ADR conflicts

If your output contradicts an existing ADR, surface it explicitly rather than silently overriding:

Contradicts ADR-0002 (dual-datasource sync) — but worth reopening because…

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 · 37 lines · 0 tokens per session scan A 211bb8723137

Subscribe to this mod's changes

domain is an agent published in the GitHub repository samanhappy/mcphub (2,362 stars, last pushed today), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 382 tokens. A static security scan graded it A with 0 findings. It is 78% identical to domain, differing in 31 lines, and is treated as a copy.