Borrowing it
Nothing to install: this file belongs to kpbray/power-bi-agent-skills. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/kpbray/power-bi-agent-skills/master/.github/skills/calculation-groups/SKILL.mdgit clone --depth 1 https://github.com/kpbray/power-bi-agent-skillsWrote 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/kpbray/power-bi-agent-skills/calculation-groups)<a href="https://agentmods.dev/skills/kpbray/power-bi-agent-skills/calculation-groups"><img src="https://agentmods.dev/badge/skills/kpbray/power-bi-agent-skills/calculation-groups/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/kpbray/power-bi-agent-skills/calculation-groups"><img src="https://agentmods.dev/badge/skills/kpbray/power-bi-agent-skills/calculation-groups.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 | $0.00029 | $0.03347 |
| Opus 5 | $0.00015 | $0.01673 |
| Sonnet 5 | $0.00006 | $0.00669 |
| Haiku 4.5 | $0.00003 | $0.00335 |
Grade A, and why
calculation-groups 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 10d ago.
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 — 492 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Calculation Groups Skill
This skill helps create calculation groups for reusable DAX patterns that can be applied dynamically to any measure.
When to Use This Skill
- Replacing repetitive time intelligence measures (YTD, PY, YoY for every base measure)
- Creating currency conversion logic
- Building dynamic period comparisons
- Implementing conditional formatting patterns
- Creating calculation templates for multiple measures
Benefits of Calculation Groups
| Without Calculation Groups | With Calculation Groups |
|---|---|
| Sales YTD, Cost YTD, Profit YTD, Revenue YTD... | 1 base measure + Time Intelligence group |
| 4 base × 5 time calcs = 20 measures | 4 base + 5 calc items = 9 objects |
| Hard to maintain | Single point of change |
Calculation Group Structure
TMDL Syntax
calculationGroup 'Time Intelligence'
precedence: 100
lineageTag: <guid>
calculationItem 'Current' =
SELECTEDMEASURE()
ordinal: 0
lineageTag: <guid>
calculationItem 'YTD' =
CALCULATE(
SELECTEDMEASURE(),
DATESYTD(Date[Date])
)
ordinal: 1
lineageTag: <guid>
Key Concepts
| Concept | Description |
|---|---|
calculationGroup |
Container for calculation items |
calculationItem |
Individual calculation pattern |
SELECTEDMEASURE() |
Reference to whatever measure is being modified |
precedence |
Order when multiple groups applied |
ordinal |
Order of items in slicer/dropdown |
Creating a Calculation Group
Step 1: Create the Table
Calculation groups require a table with a single column:
table 'Time Calculation'
lineageTag: <guid>
column 'Time Calculation'
dataType: string
isHidden: false
summarizeBy: none
sortByColumn: 'Time Calculation Order'
lineageTag: <guid>
column 'Time Calculation Order'
dataType: int64
isHidden: true
summarizeBy: none
lineageTag: <guid>
calculationGroup 'Time Intelligence'
precedence: 100
lineageTag: <guid>
calculationItem 'Current' =
SELECTEDMEASURE()
ordinal: 0
formatStringDefinition: SELECTEDMEASUREFORMATSTRING()
lineageTag: <guid>
calculationItem 'YTD' =
CALCULATE(
SELECTEDMEASURE(),
DATESYTD(Date[Date])
)
ordinal: 1
formatStringDefinition: SELECTEDMEASUREFORMATSTRING()
lineageTag: <guid>
What ships with it
3 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.
- 10d ago First seen · 492 lines · 29 tokens per session scan A e890db2816b1
calculation-groups is a skill published in the GitHub repository kpbray/power-bi-agent-skills (9 stars, last pushed 7mo ago), licensed MIT. It adds 29 tokens to every session and 3,347 once invoked, about $0.0001 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 2026-08-31.
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