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 agentmods add skills/objectstack-ai/objectstack/objectstack-datanpx skills add objectstack-ai/objectstack --skill objectstack-datagit clone --depth 1 https://github.com/objectstack-ai/objectstackWhat 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 | $0.00171 | $0.13859 |
| Opus 5 | $0.00086 | $0.06929 |
| Sonnet 5 | $0.00034 | $0.02772 |
| Haiku 4.5 | $0.00017 | $0.01386 |
Grade A, and why
objectstack-data 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 — 1,211 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Data Modeling — ObjectStack Data Protocol
Expert instructions for designing business data schemas using the ObjectStack specification. This skill covers Object definitions, Field type selection, relationship modelling, validation rules, index strategy, and lifecycle hooks.
Skill Boundaries
| Need | Use instead |
|---|---|
| Query, filter, or aggregate records | objectstack-query |
| Define REST API endpoints or auth | objectstack-api |
| Build views, dashboards, or apps | objectstack-ui |
| Create a plugin or register services | objectstack-platform |
When to Use This Skill
- You are creating a new business object (e.g.,
account,project_task) - You need to choose the right field type from the 49 supported types
- You are configuring lookup / master-detail relationships between objects
- You need to add validation rules (cross-field, state machine, format, etc.)
- You are optimising query performance with indexes
- You are extending an existing object with new fields or capabilities
- You need to implement data lifecycle hooks for business logic
Core Concepts
Object Definition
An Object is the fundamental data entity in ObjectStack. It maps to a database table and exposes automatic CRUD APIs.
Required properties:
| Property | Type | Convention | Description |
|---|---|---|---|
name |
string | snake_case |
Immutable machine identifier (/^[a-z_][a-z0-9_]*$/) |
fields |
map | keys in snake_case |
Field definitions |
Important optional properties:
| Property | Default | Description |
|---|---|---|
label |
Auto from name |
Human-readable singular label |
pluralLabel |
— | Plural form (e.g., "Accounts") |
namespace |
— | Not a schema key — ObjectSchema.create() rejects unknown keys, so authoring it is a build error. Embed the prefix directly in name instead (e.g. name: 'crm_account') |
datasource |
'default' |
Target datasource ID for virtualized data |
nameField |
derived (e.g. 'name'/'title') |
Canonical record-title field — the stored field used as the record's display name. Use a single text/email field, or a formula field (returnType: 'text') for a composite title |
displayNameField |
— | Deprecated alias for nameField (still honored as a fallback) |
titleFormat |
— | Retired (ADR-0079) — a render-only template the server can't return or query. Use nameField; for a composite title, designate a returnType: 'text' formula field as nameField |
enable |
— | Capability flags (trackHistory, searchable, apiEnabled, etc.) |
fieldGroups |
— | Ordered list of logical field groups for forms/detail pages (see Field Groups) |
lifecycle |
record semantics (permanent) |
Data retention/rotation/archival contract. Required for append-only, high-write-rate objects — a telemetry/transient/event/audit class must declare a bounding policy or parsing fails (see Data Lifecycle & Retention) |
What ships with it
11 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.
- yesterday First seen · 1,211 lines · 171 tokens per session scan A f4c5ce61d54d
objectstack-data is a skill published in the GitHub repository objectstack-ai/objectstack (45 stars, last pushed yesterday), licensed Apache-2.0. It adds 171 tokens to every session and 13,859 once invoked, about $0.0009 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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