Performance Optimization
ThibautBaissac/rails_ai_agents
Identifies and fixes Rails performance issues including N+1 queries, slow queries, and memory problems.
DAX performance optimization for semantic models. An agent skill from data-goblin/power-bi-agentic-development.
Install Dax
$ npx skills add data-goblin/power-bi-agentic-development --skill dax -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install data-goblin/power-bi-agentic-development dax --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/data-goblin/power-bi-agentic-development.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/semantic-models/skills/dax .claude/skills/dax && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "dax" agent skill from https://github.com/data-goblin/power-bi-agentic-development/tree/main/plugins/semantic-models/skills/dax into .claude/skills/dax/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "dax", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/data-goblin/power-bi-agentic-development/tree/main/plugins/semantic-models/skills/daxType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add data-goblin/power-bi-agentic-development --skill dax -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install data-goblin/power-bi-agentic-development dax --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/data-goblin/power-bi-agentic-development.git skills-src && mkdir -p .agents/skills && cp -r skills-src/plugins/semantic-models/skills/dax .agents/skills/dax && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "dax" agent skill from https://github.com/data-goblin/power-bi-agentic-development/tree/main/plugins/semantic-models/skills/dax into .agents/skills/dax/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "dax", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add data-goblin/power-bi-agentic-development --skill dax -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install data-goblin/power-bi-agentic-development dax --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/data-goblin/power-bi-agentic-development.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/plugins/semantic-models/skills/dax .cursor/skills/dax && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "dax" agent skill from https://github.com/data-goblin/power-bi-agentic-development/tree/main/plugins/semantic-models/skills/dax into .cursor/skills/dax/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "dax", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/data-goblin/power-bi-agentic-development.git --path plugins/semantic-models/skills/dax--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add data-goblin/power-bi-agentic-development --skill dax -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install data-goblin/power-bi-agentic-development dax --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/data-goblin/power-bi-agentic-development.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/plugins/semantic-models/skills/dax .gemini/skills/dax && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "dax" agent skill from https://github.com/data-goblin/power-bi-agentic-development/tree/main/plugins/semantic-models/skills/dax into .gemini/skills/dax/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "dax", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install data-goblin/power-bi-agentic-development daxInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add data-goblin/power-bi-agentic-development --skill dax -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/data-goblin/power-bi-agentic-development.git skills-src && mkdir -p .github/skills && cp -r skills-src/plugins/semantic-models/skills/dax .github/skills/dax && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "dax" agent skill from https://github.com/data-goblin/power-bi-agentic-development/tree/main/plugins/semantic-models/skills/dax into .github/skills/dax/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "dax", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add data-goblin/power-bi-agentic-development --skill dax -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install data-goblin/power-bi-agentic-development dax --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/data-goblin/power-bi-agentic-development.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/plugins/semantic-models/skills/dax .opencode/skills/dax && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "dax" agent skill from https://github.com/data-goblin/power-bi-agentic-development/tree/main/plugins/semantic-models/skills/dax into .opencode/skills/dax/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "dax", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
dax- GitHub stars
- 1k
- Token cost
- ~593 tokens
- SKILL.md length
- 197 words
- Files
- 5 (incl. references)
- Skills in repo
- 33
- Repo updated
- First seen
- Licence
- GPL-3.0
At a glance
DAX performance optimization for semantic models. An agent skill from data-goblin/power-bi-agentic-development.
- Asks to optimize DAX
- SKILL.md covers Optimization and Related Skills
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- DAX performance
What it does
Dax is an agent skill from data-goblin/power-bi-agentic-development. DAX performance optimization for semantic models. Automatically invoke when the user asks to "optimize DAX", "fix slow DAX", "DAX performance", "tune a measure", "debug a measure", "DAX anti-patterns", or mentions slow queries, server timings, or DAX authoring.
Its SKILL.md is about 590 tokens, which your agent loads only when the skill is triggered. The skill folder holds 5 other files, including reference files (for example `references/dax-patterns.md`, `references/dax-performance-optimization.md` and `references/engine-internals.md`).
It sits in Development, covering Query optimization and Performance optimization. The repository describes itself as: Power BI AI skills and Power BI agents for Claude Code and GitHub Copilot: a plugin marketplace of Power BI skills, subagents, and hooks for semantic models, DAX, TMDL, reports… The licence is GPL-3.0.
When your agent uses it
- Asks to optimize DAX
- DAX performance
- Debug a measure
- DAX anti-patterns
Example prompts
- “optimize DAX”
- “fix slow DAX”
- “DAX performance”
- “/dax”
What it can do on your machine
Read from SKILL.md and the folder at commit 41886f2. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Dax loads about 593 tokens when it runs, and up to ~17k if it reads all its reference files. Until then it costs about 66 tokens; SKILL.md has 197 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from data-goblin/power-bi-agentic-development at commit 41886f2, republished under its GPL-3.0 licence (© data-goblin). 197 words, ~593 tokens.
Download SKILL.mdSave it as
.claude/skills/dax/SKILL.md (or your agent's skills folder). This skill also uses 4 other files; get the full folder from GitHub.- name
- dax
- description
- DAX performance optimization for semantic models. Automatically invoke when the user asks to "optimize DAX", "fix slow DAX", "DAX performance", "tune a measure", "debug a measure", "DAX anti-patterns", or mentions slow queries, server timings, or DAX authoring.
DAX
Skills and references for writing, debugging, and optimizing DAX in semantic models.
Optimization
For systematic DAX query performance optimization, read the workflow reference first:
references/dax-performance-optimization.md — Tiered framework (4 tiers), phased workflow, decision guide, and error handling.
Detailed reference files (progressive disclosure — consult as directed by the workflow):
references/engine-internals.md— FE/SE architecture, xmSQL, compression/segments, SE fusion, trace diagnosticsreferences/dax-patterns.md— Tier 1 DAX patterns (DAX001–DAX021) + Tier 2 query structure (QRY001–QRY004)references/model-optimization.md— Tier 3 model patterns (MDL001–MDL009) + Tier 4 Direct Lake (DL001–DL002)
Trace capture and performance profiling:
- Local models (Power BI Desktop): Use the Tabular Editor CLI
te query(see thete-cliskill) first; as an alternative, theconnect-pbidskill covers FE/SE timing (performance-profiling.md) and intermediate result inspection (evaluateandlog-debugging.md). - Remote models (Fabric Service / XMLA): Run DAX with the Tabular Editor CLI
te query(-s <workspace> -d <model>) against the workspace XMLA endpoint; see thete-cliskill (tabular-editor plugin). - Power BI Modeling MCP: also available for trace and query if you prefer an MCP tool; reach for it after the options above.
Related Skills
semantic-model— Model design, build, and auditing including DAX anti-patterns and best practicesconnect-pbid(pbi-desktop plugin) — Trace capture, performance profiling, EVALUATEANDLOG debugginglineage-analysis— Impact analysis before model changes
© data-goblin, GPL-3.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 4 other files (references) in plugins/semantic-models/skills/dax of data-goblin/power-bi-agentic-development.
- SKILL.md
- references/dax-patterns.md
- references/dax-performance-optimization.md
- references/engine-internals.md
- references/model-optimization.md
Open the folder on GitHubat commit 41886f2
Compare with similar skills
Dax next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Dax this skilldata-goblin/power-bi-agentic-development | 1k | — | ~593 | Automated safety check: Pass | GPL-3.0 | |
| Performance OptimizationThibautBaissac/rails_ai_agents | 665 | — | ~1.2k | Automated safety check: Notes | MIT | |
| Mz ProfileMaterializeInc/materialize | 6.4k | — | ~480 | Automated safety check: Pass | Custom licence | |
| Performance CheckZeroDeng01/sublinkPro | 1.7k | — | ~1.8k | Automated safety check: Pass | MIT | |
| WooCommerce PHP Performance Patternswoocommerce/woocommerce | 11k | — | ~395 | Automated safety check: Pass | Custom licence | |
| Advpl Debuggingthalysjuvenal/advpl-specialist | 185 | — | ~487 | Automated safety check: Pass | MIT |
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Categories
Questions about Dax
What does Dax do?
DAX performance optimization for semantic models. An agent skill from data-goblin/power-bi-agentic-development. Dax is an agent skill from data-goblin/power-bi-agentic-development. DAX performance optimization for semantic models.
When should I use Dax?
Dax fits situations like: asks to optimize DAX; DAX performance; debug a measure; DAX anti-patterns.
How do I install Dax in Claude Code?
Run `npx skills add data-goblin/power-bi-agentic-development --skill dax -a claude-code`. Or copy the skill folder (plugins/semantic-models/skills/dax in data-goblin/power-bi-agentic-development) into .claude/skills/dax in your project. Claude Code loads it when a task matches its description.
How do I install Dax in Codex?
Run `npx skills add data-goblin/power-bi-agentic-development --skill dax -a codex`. Or copy the skill folder (plugins/semantic-models/skills/dax in data-goblin/power-bi-agentic-development) into .agents/skills/dax in your project. Codex loads it when a task matches its description.
Can I use Dax in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add data-goblin/power-bi-agentic-development --skill dax -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/dax, .gemini/skills/dax, .github/skills/dax and .opencode/skills/dax in your project.
What does Dax need to run?
SKILL.md names no scripts, command-line tools or credentials: Dax is instructions for the agent only.
Does Dax access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Dax safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Dax use?
Dax is published under the GPL-3.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Dax use?
About 593 tokens (SKILL.md is roughly 2.4k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 16k tokens, read only when the agent opens those files.
What are the alternatives to Dax?
Skills that share tags, products or a category with Dax: Performance Optimization (ThibautBaissac/rails_ai_agents, 665 stars), Mz Profile (MaterializeInc/materialize, 6.4k stars), Performance Check (ZeroDeng01/sublinkPro, 1.7k stars) and WooCommerce PHP Performance Patterns (woocommerce/woocommerce, 11k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Dax?
data-goblin (a GitHub user) maintains it in data-goblin/power-bi-agentic-development, which has 1,026 GitHub stars. The repository holds 33 skills in this directory. The repository was last updated on October 5, 2026.
Source: data-goblin/power-bi-agentic-development on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.