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.
npx skills add xonovex/platform --skill data-model-guidegit clone --depth 1 https://github.com/xonovex/platformWrote 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/xonovex/platform/data-model-guide)<a href="https://agentmods.dev/skills/xonovex/platform/data-model-guide"><img src="https://agentmods.dev/badge/skills/xonovex/platform/data-model-guide/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/xonovex/platform/data-model-guide"><img src="https://agentmods.dev/badge/skills/xonovex/platform/data-model-guide.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 | $0.00103 | $0.01143 |
| Opus 5 | $0.00051 | $0.00571 |
| Sonnet 5 | $0.00021 | $0.00229 |
| Haiku 4.5 | $0.00010 | $0.00114 |
Grade A, and why
data-model-guide 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 yesterday.
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 — 60 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Data-Model Guidelines
Essentials
- One central model - Route tool/editor state through a single typed object store, not scattered structs, see references/object-model.md
- Make mutation observable - Edits go through the model so it can notify, undo, and persist, see references/change-notification.md
Object model
- Typed objects - Describe each type by a runtime schema, not a hand-written C struct, see references/object-model.md
- Property set per type - bool/int/float/string/reference/sub-object/buffer/array properties, see references/object-model.md
- Data-driven types - Add a type or property at runtime without recompiling, see references/object-model.md
- Separate metadata from instances - Type/schema lives once; instance data is just values, see references/object-model.md
References & ownership
- Strong = owning sub-object - A parent owns its sub-objects; deleting the parent deletes them, see references/references-and-ownership.md
- Local vs global ids - Local ids inside a file, GUIDs for cross-file/cross-session links, see references/references-and-ownership.md
- Identity vs role - A GUID names a fixed identity; a name/path names a role that late-binds: default to GUIDs, see references/references-and-ownership.md
Prototypes & overrides
- Per-property override bitmask - One bit per property marks local-vs-inherited; sub-object sets track inherited / instantiated / removed children, see references/prototypes.md
Mutation
- Pull vs push - Poll a version number, or register callbacks; avoid notification storms, see references/change-notification.md
- Undo/redo - Record inverse ops or before/after snapshots into an undo journal, see references/undo-redo.md
What ships with it
10 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.
- eval-queries.json 6.1 KB
- evals.json 3.2 KB
- references/change-notification.md 3.1 KB
- references/object-model.md 3.9 KB
- references/prototypes.md 3.2 KB
- references/references-and-ownership.md 4.6 KB
- references/serialization.md 6.4 KB
- references/snapshots-and-threading.md 5.1 KB
- references/undo-redo.md 5.0 KB
- SOURCES.md 4.5 KB
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.
- yesterday First seen · 60 lines · 103 tokens per session scan A 10455b63b78b
data-model-guide is a skill published in the GitHub repository xonovex/platform (5 stars, last pushed 2d ago), licensed MIT. It adds 103 tokens to every session and 1,143 once invoked, about $0.0005 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 2026-09-08.
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