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 Wals-pro/claude-power-automate --skill power-automate-expression-syntaxgit clone --depth 1 https://github.com/Wals-pro/claude-power-automateWrote 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/wals-pro/claude-power-automate/power-automate-expression-syntax)<a href="https://agentmods.dev/skills/wals-pro/claude-power-automate/power-automate-expression-syntax"><img src="https://agentmods.dev/badge/skills/wals-pro/claude-power-automate/power-automate-expression-syntax/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/wals-pro/claude-power-automate/power-automate-expression-syntax"><img src="https://agentmods.dev/badge/skills/wals-pro/claude-power-automate/power-automate-expression-syntax.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 | $0.00072 | $0.00348 |
| Opus 5 | $0.00036 | $0.00174 |
| Sonnet 5 | $0.00014 | $0.00070 |
| Haiku 4.5 | $0.00007 | $0.00035 |
Grade A, and why
power-automate-expression-syntax 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 11d 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.
What it actually says
Power Automate Expression Syntax
Power Automate cloud flows use Workflow Definition Language expressions. Power Fx is a separate formula language and is not the default for cloud-flow JSON.
Workflow
- Identify the expression host:
- Cloud-flow action/condition/JSON: WDL expressions.
- Desktop flow formula mode: Power Fx.
- For cloud-flow expressions, read
references/cloud-flow-expressions.md. - For desktop-flow Power Fx, read
references/power-fx-desktop-flows.md. - Validate against live run inputs where possible; expression errors are often data-shape errors rather than syntax-only errors.
Cloud-Flow Guardrails
- Use
@{...}inside string interpolation and@...when the whole value is an expression. - Prefer null-safe access with
?[]for optional action outputs. - Use exact action names in
outputs('Action_Name'),body('Action_Name'), andactions('Action_Name'). - Avoid copying expressions from rendered docs without checking quotes and invisible characters.
- Confirm a function exists in
power-automate-reference(the complete WDL namespace) before using it — the namespace is closed; do not invent functions.
What ships with it
2 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.
- 11d ago First seen · 38 lines · 72 tokens per session scan A af78355c7c47
power-automate-expression-syntax is a skill published in the GitHub repository Wals-pro/claude-power-automate (11 stars, last pushed 2d ago), licensed MIT. It adds 72 tokens to every session and 348 once invoked, about $0.0004 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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