What is looker-to-sigma?

A migration tool for rebuilding Looker’s data definitions and dashboards in Sigma. Looker is a business-intelligence platform, LookML is its language for describing data, and Sigma is another platform for exploring data and making workbooks.

Use it to convert LookML projects, explores, and dashboards into Sigma data models and matching workbooks.

It helps avoid recreating Looker content by hand when moving to Sigma. It is intended for projects, data views, and dashboards already stored in Looker.

looker-to-sigma — 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/looker-to-sigma

Made for: Claude Code.

Or install looker-to-sigma, the plugin that ships this one along with the rest of its 2 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/looker-to-sigma/github.svg)](https://agentmods.dev/skills/twells89/sigma-migration-skills/looker-to-sigma)

Your own site

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

Per session 146 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 21,553 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: 2 findings, up to high

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 →

high Tool Misuse · line 878
Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).

Fix: Validate all tool parameters against an allowlist. Reject dangerous parameter values (shell=True, --force, -rf /) and use safe defaults.
medium Rogue Agent · line 810
Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.

Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.

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	$0.00146	$0.21553
Opus 5	$0.00073	$0.10776
Sonnet 5	$0.00029	$0.04311
Haiku 4.5	$0.00015	$0.02155

Measured 4d ago against content hash 70c44f2af972, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

looker-to-sigma 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 4d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (converter/lookml.mjs), 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`-POST to `/v2/workbooks` / lay out empty "placeholder" pages** — that

plugins/looker-to-sigma/skills/looker-to-sigma/SKILL.md · 1,047 lines

How it starts

The opening of the file, as written. The whole thing — 1,047 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Looker → Sigma Conversion

Windows / first run — run the environment doctor before anything else: bash scripts/doctor.sh (macOS/Linux/Git Bash) or powershell -ExecutionPolicy Bypass -File scripts\doctor.ps1 (Windows). It checks Ruby/Python/Node/bash and flags the Python "Store stub" + CRLF with exact fixes. Details: refs/environment.md.

Preflight the workbook spec before POST (mandatory)

Before POSTing any workbook spec, run ruby scripts/lib/preflight_lint.rb <spec.json> — it exits 1 with a precise message on the two migration-killer bugs: a table with aggregate columns + dimensions but no groupings (renders raw detail rows), and a malformed control (missing id/controlId/controlType or nesting value fields under a value object instead of flat, a non-double-nested source, or a list control wired to neither source nor filters — a filters-only list control is valid). Fix every violation first — never POST past it, and never conclude a feature is "unsupported" from an Invalid kind error (it means the inner fields are wrong). Verified shapes: sigma-workbooks controls.md / tables.md.

Phase 0a — Choose where to build (ask first when no destination given)

Don't silently land the migrated data model + workbook in an auto-picked folder. If the user didn't supply a destination (no --folder <id> and no SIGMA_FOLDER_ID), ASK before building:

python3 scripts/pick_destination.py list → { workspaces, folders (editable, with parentName), myDocuments }
Let the user pick ONE: a workspace (its id lands content in the workspace root), an existing folder, My Documents (when non-null — null for service tokens), or create a new folder: python3 scripts/pick_destination.py create --name "<name>" [--parent <workspace-or-folder-id>]
Pass the chosen id as --folder <id>. folderId accepts a workspace id or a folder id.

If a destination is already supplied, honor it silently — don't ask.

Read the full file on GitHub · 1,047 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.

4d ago Changed · -1 lines 70c44f2af972
13d ago First seen · 1,048 lines · 146 tokens per session scan A 092ee6bd482e

Subscribe to this mod's changes

looker-to-sigma is a skill published in the GitHub repository twells89/sigma-migration-skills (16 stars, last pushed yesterday), licensed MIT. It adds 146 tokens to every session and 21,553 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.

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