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 skills add jnPiyush/AgentX --skill canvas-app-yamlgit clone --depth 1 https://github.com/jnPiyush/AgentXWrote 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/jnpiyush/agentx/canvas-app-yaml)<a href="https://agentmods.dev/skills/jnpiyush/agentx/canvas-app-yaml"><img src="https://agentmods.dev/badge/skills/jnpiyush/agentx/canvas-app-yaml/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/jnpiyush/agentx/canvas-app-yaml"><img src="https://agentmods.dev/badge/skills/jnpiyush/agentx/canvas-app-yaml.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00076 | $0.01302 |
| Opus 5.5 | $0.00030 | $0.00521 |
| Sonnet 5.5 | $0.00015 | $0.00260 |
| Haiku 4.5 | $0.00008 | $0.00130 |
Grade A, and why
canvas-app-yaml 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 1mo 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 — 124 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Power Apps Canvas App YAML
Purpose: emit canvas app source that round-trips through
pac canvas unpack/pac canvas packand packs into a solution underCanvasApps/.
When to Use
- Generating a canvas app (forms, galleries, screens over Dataverse or other data) from a PRD-LOWCODE
- Editing screen logic or controls in an existing unpacked app
- Reviewing Power Fx before packaging
On-Disk Layout (after pac canvas unpack)
CanvasApps/
<prefix>_<appname>_<DocumentUri>/
CanvasManifest.json # app metadata, dependencies, data sources, app-level Power Fx
Src/
App.fx.yaml # App.OnStart, App.Formulas, named formulas
<ScreenName>.fx.yaml # one file per screen, control tree + Power Fx
Component/ # reusable canvas components
Assets/ # images, media
Connections/ # data source connection metadata
DataSources/ # *.json per data source (table, connector)
pac canvas pack --sources ./Src --msapp build/app.msapp rebuilds the .msapp, which pac solution pack then embeds.
The Src YAML Control Tree
Each screen is a YAML tree. Indentation defines nesting. Each control has Control: and a properties block. Power Fx expressions are prefixed with =.
Screens:
HomeScreen:
Properties:
Fill: =RGBA(248, 249, 250, 1)
Children:
- TitleLabel:
Control: [email protected]
Properties:
Text: ="Issues"
Size: =24
FontWeight: =FontWeight.Semibold
- IssueGallery:
Control: [email protected]
Variant: galleryVertical
Properties:
Items: =SortByColumns(Filter(Issues, Status.Value = "Open"), "agx_duedate")
OnSelect: =Set(varSelected, ThisItem)
Children:
- TitleRow:
Control: [email protected]
Properties:
Text: =ThisItem.agx_name
Rules:
Control: <Name>@<version>-- the version must match a control the target environment ships. Use current GA versions; do not invent.- Property values are Power Fx, always
=-prefixed. Children:is an ordered list; z-order follows list order.
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.
- 1mo ago Changed e9b2d87c6fd7
- 1mo ago First seen · 124 lines · 76 tokens per session scan A 2778f6647e0e
canvas-app-yaml is a skill published in the GitHub repository jnPiyush/AgentX (16 stars, last pushed 3d ago), licensed Apache-2.0. It adds 76 tokens to every session and 1,302 once invoked, about $0.0003 per session on Opus 5.5. 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 2026-09-03.
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