Upload Download File
Uploads a local file to an HTML5 file input, or triggers a download and captures the resulting path. Composes with multi-step-form for file-attaching workflows.
Install
$ agentstack add skill-bettyguo-browser-skills-upload-download-file ✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.
Security review
✓ PassedNo issues found. Passed automated security review. · v0.1.0 How review works →
- ✓ Prompt-injection patterns
- ✓ Secret / credential exfiltration
- ✓ Dangerous shell & filesystem operations
- ✓ Untrusted network calls
- ✓ Known-malicious package signatures
What it can access
- ✓ Network access No
- ✓ Filesystem access No
- ✓ Shell / process execution No
- ✓ Environment & secrets No
- ✓ Dynamic code execution No
From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.
Verified badge
Passed review? Show it. Paste this badge into your README, it links to the public security report.
Links to your public security report.[](https://agentstack.voostack.com/security/report/skill-bettyguo-browser-skills-upload-download-file) Reliability & compatibility
Declared compatibility
Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.
We're building live execution health for every listing: tool-call success rate, median latency, uptime, and last-checked timestamps, measured, not self-reported. It isn't live yet, so we don't show numbers we can't stand behind.
How agent discovery & health will work →About
Upload / Download File
When to invoke
The user task requires uploading a local file or capturing a download. The agent provides the file path in vars.file_path (uploads) or a target directory in vars.download_dir (downloads).
The matcher hits this skill when an `` is present on the page.
Recipe
Upload mode (vars.mode = "upload" or auto-detected via input[type=file] presence)
- waitforselector selector="input[type='file']" state=attached timeout=5s
- fill selector="input[type='file']" value="$vars.file_path"
- wait extra=300ms
Download mode (vars.mode = "download")
Downloads in headless browsers route through the browser's download API; this skill stubs the recipe for now and defers to the runner's download event handler (M5 wiring).
Success criteria (upload mode)
- assert inputtypefilehasfiles selector="input[type='file']"
When NOT to use
- File-attach widgets that don't use a real `` (proprietary
drag-and-drop). Vision fallback or a per-site bespoke approach.
- Multi-file uploads requiring drag-drop reorder. Not in v0.1.
Known failures
- Sites that gate file inputs behind a click-to-reveal: the input
isn't attached until a wrapper button is clicked. Run a click primitive first; spec your agent to chain.
- Server-side validation of file size / type: the skill submits;
the agent reads validation errors via the form's error-message recipe.
- macOS sandboxing of Playwright file uploads: if Playwright runs
in a security context that can't read ~/Documents, uploads silently fail. Document in the agent's expected setup.
Related skills
fill-multi-step-form— common parent flowverify-page-loaded— run before to ensure the file input has rendered
Source & license
This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.
- Author: bettyguo
- Source: bettyguo/browser-skills
- License: MIT
Install and usage instructions live in the source repository linked above.
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Versions
- v0.1.0 Imported from the upstream source.