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 SharePoint/spfx-dev-skills --skill spfxgit clone --depth 1 https://github.com/SharePoint/spfx-dev-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/sharepoint/spfx-dev-skills/spfx)<a href="https://agentmods.dev/skills/sharepoint/spfx-dev-skills/spfx"><img src="https://agentmods.dev/badge/skills/sharepoint/spfx-dev-skills/spfx/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/sharepoint/spfx-dev-skills/spfx"><img src="https://agentmods.dev/badge/skills/sharepoint/spfx-dev-skills/spfx.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 | $0.00143 | $0.00501 |
| Opus 5.5 | $0.00057 | $0.00200 |
| Sonnet 5.5 | $0.00029 | $0.00100 |
| Haiku 4.5 | $0.00014 | $0.00050 |
Grade A, and why
spfx 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 2mo 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
SPFx Development
Pick the reference(s) that match the user's intent. Load only what is needed and execute the steps exactly:
- Create a project → create.md
- Upgrade a project → upgrade.md
- Working on UI in a React SPFx project (components, styling, layout, accessibility) → react-design.md
- Reading or writing SharePoint / Microsoft Graph data → pnpjs.md
Global rules (apply to every SPFx task)
- Use PnPjs by default for all SharePoint and Microsoft Graph data operations. See pnpjs.md. Only fall back to raw
SPHttpClient/MSGraphClientV3when the user explicitly requires it or a dependency cannot be added. - When running
npm install, always run it synchronously with a timeout of at least 3 minutes. SPFx projects have heavy dependency trees.
Toolchain decision rule
SPFx switched build systems at v1.22.0. Determine the version from .yo-rc.json (@microsoft/generator-sharepoint.version) or package.json, then:
| Installed SPFx version | Toolchain |
|---|---|
| v1.22.0 and newer | Heft |
| v1.0 – v1.21.1 | gulp (legacy) |
What ships with it
4 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.
- 2mo ago First seen · 29 lines · 143 tokens per session scan A eef818b67b86
spfx is a skill published in the GitHub repository SharePoint/spfx-dev-skills (25 stars, last pushed 2mo ago), licensed MIT. It adds 143 tokens to every session and 501 once invoked, about $0.0006 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 2026-08-31.
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