A single-file HTML framework for Openclaw Skills that turns engineering inputs into print-ready calculations, diagrams, and client deliverables.
Install & Download
1. ClawHub CLI
The fastest way to install a skill directly from the registry.
npx clawhub@latest install ephemeral-eng
2. Manual Installation
Copy the skill folder to one of these locations
~/.openclaw/skills/ <project>/skills/ Priority: Workspace > Local > Bundled
3. Prompt Installation
Copy this prompt to OpenClaw to install it automatically.
Help me install ephemeral-eng using Clawhub. If Clawhub is not installed, install it first (npm i -g clawhub).
Prefer to download?
Get the raw skill files in a ZIP archive.
What is ephemeral-eng Input-to-Deliverable Engineering Tools?
ephemeral-eng is an Openclaw Skills workflow for creating one self-contained HTML file that acts as both the engineering calculator and the final client deliverable. The user works in a browser with an input panel on the left while the right side renders a paginated, print-ready report that can be issued directly to PDF.
The skill standardizes the entire lifecycle: brand tokens, input schemas, pure JavaScript calculation logic, live SVG sketches, report pages, save/load JSON state, and a strict verification workflow. Every file ships unverified by default, preserving the draft watermark and verification note until the engineer completes VERIFICATION.md and confirms the numbers by hand.
ephemeral-eng Input-to-Deliverable Engineering Tools Use Cases
- Building engineering calculators, calc tools, and report generators from a single HTML file
- Producing load checks and evaluation letters for beams, columns, footings, headers, fasteners, anchors, wind, guardrails, and canopies
- Revising existing single-file tools that already use a form-panel and report-page layout
- Creating client-issued PDF reports that must show every input, assumption, and substituted calculation
- Preloading jobs from architect notes, emails, or plan documents with traceable inputs
- Saving portable project state for archived jobs and future revisions
How ephemeral-eng Input-to-Deliverable Engineering Tools Works
- Clarify the scope, governing code edition, design method, exposed inputs, and final deliverable type.
- State the formulas, assumptions, and code citations in plain English first, then wait for confirmation before coding.
- Start from the template and fill only the five slots: brand tokens, input schema, calc engine, live diagram, and report pages.
- Keep the calculation engine pure, validate inputs, and render substituted-number steps plus a live SVG diagram for quick review.
- Preserve versioning, footer stamps, watermark behavior, and JSON save/load portability so the file stays reusable across revisions.
- Deliver the HTML file, the formula and citation list, the exclusions and assumptions, and the explicit unverified-tool warning with a pointer to VERIFICATION.md.
ephemeral-eng Input-to-Deliverable Engineering Tools Setup
- Start from template/ephemeral-template.html or the user's latest working tool.
- Copy it into a versioned filename and keep the existing layout intact.
cp template/ephemeral-template.html V26150_Footing_Check_v1_0.html
- Edit only the five template slots; do not change the framework chrome.
- Keep the draft watermark checkbox ON and preserve the verification footer note.
- Leave the Save inputs / Load inputs JSON module in place so project state stays portable.
- Open the file in a browser and verify the result against VERIFICATION.md before use.
open V26150_Footing_Check_v1_0.html
ephemeral-eng Input-to-Deliverable Engineering Tools Data Schema & Taxonomy
The skill uses a fixed internal taxonomy so every Openclaw Skills tool stays portable, reviewable, and easy to diff.
| Element | Shape | Purpose |
|---|---|---|
FIRM |
JS object | Brand tokens, identity, fonts, colors, version strings, and logo handling |
f_* inputs |
Form controls | Every editable input uses an f_camelCase id and is grouped into branded fieldsets |
r |
Flat result object | Derived values, pass/fail states, DCRs, and other computed outputs |
d |
Data snapshot | Input snapshot passed into drawDiagram(inp, r), buildReport(d, r), and wm(d) |
images.logoData |
Nullable data URL | Uploaded brand logo preserved through save/load |
images.imgData |
Nullable data URL | Optional appendix exhibit or dropped image preserved through save/load |
_meta |
JSON object | framework, tool, toolVersion, saved, and source metadata |
.report-page |
HTML section | US Letter report page with footer, watermark, and print pagination |
Metadata taxonomy for exported state:
_meta.frameworkis alwaysephemeral-eng._meta.toolstores the tool name fromFIRM.toolName._meta.toolVersionis the visible version used in the title, badge, and footer._meta.savedis an ISO-8601 timestamp._meta.sourceisuserfor manual saves andaifor pre-generated inputs.inputscontains everyf_*field exactly as exported.imagescontains the saved logo and exhibit image payloads.
File organization and output conventions:
- Main deliverable:
{ProjectNo_}ToolName_vX_Y.html - Portable state file: JSON export from
serializeInputs,exportJSON, andimportJSON - Optional appendix: dropped images only if the user provides them
- Report construction:
buildReport(d, r)emits.report-pageblocks, while numbers are formatted withnum(x, dp)and user text is escaped withesc(s)
ephemeral-eng Input-to-Deliverable Engineering Tools Advanced Features
- Single-file distribution with no build step, no dependencies, and no server
- Live to-scale-ish SVG diagram with screen-only PASS/FAIL feedback
- Print-ready US Letter report pages with branded footers and optional appendices
- Save/load JSON state that preserves every
f_*input and dropped image - AI pre-generation mode for loading traceable inputs from project notes or emails by setting
_meta.sourcetoai - Explicit code citations, substituted-number calculations, and DCR / PASS-FAIL summary tables
- Letter-generator variant for evaluation and compliance letters, with prose front matter and calculation exhibits
- Safe revision workflow: change only what was requested, keep the layout stable, and bump the version on any functional change
- Brand re-skinning by editing only the
:rootCSS variables andFIRMobject, keeping the rest of the template untouched
SKILL.md
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