What is sigma-workbooks?

A guide for creating Sigma workbooks: JSON definitions that describe dashboard pages, charts, tables, controls, formulas, data sources, and layout. It uses Sigma's REST API specification along with examples and style guidance.

Use it to create, edit, validate, and improve Sigma workbook specifications programmatically.

It helps you understand the large workbook format and avoid building invalid or poorly arranged dashboard definitions from the API documentation alone.

sigma-workbooks — Skill for Claude Code by twells89

Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo

git clone --depth 1 https://github.com/twells89/sigma-migration-skills

agentmods

npx agentmods add skills/twells89/sigma-migration-skills/sigma-workbooks

Made for: Claude Code.

Or install sigma-authoring, the plugin that ships this one along with the rest of its 5 skills.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/twells89/sigma-migration-skills/sigma-workbooks/github.svg)](https://agentmods.dev/skills/twells89/sigma-migration-skills/sigma-workbooks)

Your own site

<a href="https://agentmods.dev/skills/twells89/sigma-migration-skills/sigma-workbooks"><img src="https://agentmods.dev/badge/skills/twells89/sigma-migration-skills/sigma-workbooks/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/twells89/sigma-migration-skills/sigma-workbooks"><img src="https://agentmods.dev/badge/skills/twells89/sigma-migration-skills/sigma-workbooks.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 132 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 7,259 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector warn 7 Sept 2026

SkillSpector: 1 finding, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

medium Data Exfiltration · line 140
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.

How audits are shown

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.

Model	Per session	Once invoked
Fable 5.1	$0.00132	$0.07259
Opus 5	$0.00066	$0.03630
Sonnet 5	$0.00026	$0.01452
Haiku 4.5	$0.00013	$0.00726

Measured 11d ago against content hash c9c80bd2c8e9, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

sigma-workbooks scanned grade A with 1 finding 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 11d ago.

The scan reads SKILL.md. This mod also ships 22 executable files (scripts/bootstrap.ps1, scripts/bootstrap.sh, scripts/doctor.ps1, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl -sfL https://assets.sigmacomputing.com/openapi/public-rest-api/sigma-computing-public-rest-api.json \

plugins/sigma-authoring/skills/sigma-workbooks/SKILL.md · 392 lines

How it starts

The opening of the file, as written. The whole thing — 392 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Sigma Workbooks (Spec via REST API)

This skill helps you build effective Sigma workbooks by navigating the Sigma OpenAPI and applying style guidance + proven recipes beyond what the OpenAPI alone teaches.

Scope

The workbook spec — the JSON you POST to /v2/workbooks/spec defining pages, elements, sources, formulas, and layout. Lifecycle around the workbook (embeds, grants, materialization schedules, bookmarks, sharing) is a separate API surface and out of scope here.

Sources of truth

Sigma's public API docs are an index at https://help.sigmacomputing.com/openapi.json that lists two canonical split specs (split from one large spec to fix compilation / out-of-memory errors — so the structure changed subtly). That index now serves an HTML page, not JSON (verified 2026-08-05) — it renders links to the two specs rather than returning a machine-readable list, so treat it as a human landing page and go straight to the two URLs below:

https://help.sigmacomputing.com/openapi/openapi/sigma-rest-api.json — the REST API: endpoint request/response shapes (workbooks, data models, members, connections, exports, materialization, …). Use for API calls.
https://help.sigmacomputing.com/openapi/openapi/code-representation.json — the "code representation" (as-code) spec. Today it documents the data-model spec (/v2/dataModels/spec); use it for data-model element shapes.

Workbook element/control/format shapes (the bar-chart / kpi-chart / control / format kinds that go under /v2/workbooks/spec) are not inlined in either split spec — get them from one of, roughly in this order.

The split specs don't document the workbook spec endpoint at all (verified 2026-08-05): sigma-rest-api.json has zero paths matching spec — no /v2/workbooks/spec, no /v2/workbooks/spec/verify, no /v2/workbooks/{id}/spec — and code-representation.json carries only the two /v2/dataModels/spec* paths. So for workbook authoring the split specs are not merely missing the inlined element shapes; the endpoint itself is absent. Use a per-endpoint reference page, the compiled asset, or a live readback (all below).

Read the full file on GitHub · 392 lines

Files

What ships with it

60 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.

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.

11d ago First seen · 392 lines · 132 tokens per session scan A c9c80bd2c8e9

Subscribe to this mod's changes

sigma-workbooks is a skill published in the GitHub repository twells89/sigma-migration-skills (16 stars, last pushed today), licensed MIT. It adds 132 tokens to every session and 7,259 once invoked, about $0.0007 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Analytics and metrics

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sigma-workbooks