Borrowing it
Nothing to install: this file belongs to sussdorff/timing-cli. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/sussdorff/timing-cli/main/.agents/skills/domain-modeling/SKILL.mdgit clone --depth 1 https://github.com/sussdorff/timing-cliWrote 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.
[](https://agentmods.dev/skills/sussdorff/timing-cli/domain-modeling)<a href="https://agentmods.dev/skills/sussdorff/timing-cli/domain-modeling"><img src="https://agentmods.dev/badge/skills/sussdorff/timing-cli/domain-modeling/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.
<a href="https://agentmods.dev/skills/sussdorff/timing-cli/domain-modeling"><img src="https://agentmods.dev/badge/skills/sussdorff/timing-cli/domain-modeling.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00083 | $0.00936 |
| Opus 5.5 | $0.00033 | $0.00374 |
| Sonnet 5.5 | $0.00017 | $0.00187 |
| Haiku 4.5 | $0.00008 | $0.00094 |
Grade A, and why
domain-modeling 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 24d 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.
How it starts
The opening of the file, as written. The whole thing — 55 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Domain Modeling
Actively build and sharpen the project's domain model as you design. Challenge terms,
invent edge-case scenarios, and write the glossary and decision records the moment
they crystallise. Merely reading GLOSSARY.md for vocabulary is not this skill; this
skill changes the domain model.
Inputs
- The current conversation, code, and any existing
GLOSSARY.md/GLOSSARY-MAP.md. - Existing
docs/adr/,docs/bdr/anddocs/decisions.mdwhen they exist.
Outputs
- An updated
GLOSSARY.md, created lazily. It is a glossary and nothing else. - An ADR in
docs/adr/or a BDR indocs/bdr/only when the offer tests pass. - One line per record in the
docs/decisions.mddecision index.
Workflow
- Before writing, migrate a legacy glossary on touch, all in one change. Paths are relative to the context root.
- With
CONTEXT.mdand noGLOSSARY.md, rungit mv CONTEXT.md GLOSSARY.md. With both, merge theCONTEXT.mdterms intoGLOSSARY.md, ask the user about conflicting definitions, thengit rm CONTEXT.md. - Move the old
## Decisionslines into that context'sdocs/decisions.mdand rewrite each link relative todocs/decisions.md:docs/adr/x.mdbecomesadr/x.md,docs/bdr/x.mdbecomesbdr/x.md. Merge into an existingdocs/decisions.md; never overwrite it. - With
CONTEXT-MAP.md, rungit mv CONTEXT-MAP.md GLOSSARY-MAP.mdand migrate every context it lists in the same change, so the map never mixes old and new names. - Update references to the renamed files in
AGENTS.md,CLAUDE.md,docs/agents/domain.mdand the per-context links ofGLOSSARY-MAP.md.
- With
- Challenge terms against
GLOSSARY.md. Call out conflicts immediately. - Sharpen fuzzy or overloaded language into a canonical term.
- Stress-test relationships with concrete scenarios, including edge cases.
- Check the code when the user states how something works. Surface contradictions.
- Update
GLOSSARY.mdinline when a term is resolved. Use GLOSSARY-FORMAT.md. Create the file lazily. It holds terms only: no decision index, no spec, no implementation detail. - Offer a decision record only when the three tests in ADR-FORMAT.md or BDR-FORMAT.md all hold. Business and product commitments go to BDRs. Technical shape goes to ADRs. After writing either record, add one index line to
docs/decisions.md. Whenever you touch decisions, also add index lines for records indocs/adr/anddocs/bdr/that the index does not list yet; upstreamdomain-modelingwrites ADRs without indexing them.
What ships with it
3 files 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.
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.
- 24d ago Changed · +7 lines · +54 tokens per session caf9488cd421
- 1mo ago First seen · 48 lines · 29 tokens per session scan A b004dfda87ba
domain-modeling is a skill published in the GitHub repository sussdorff/timing-cli (1 stars, last pushed 10d ago), licensed MIT. It adds 83 tokens to every session and 936 once invoked, about $0.0003 per session on Opus 5.5. 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 2026-09-24.
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