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 dleerdefi/claude-code-construction --skill viewport-highlightergit clone --depth 1 https://github.com/dleerdefi/claude-code-constructionWrote 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/dleerdefi/claude-code-construction/viewport-highlighter)<a href="https://agentmods.dev/skills/dleerdefi/claude-code-construction/viewport-highlighter"><img src="https://agentmods.dev/badge/skills/dleerdefi/claude-code-construction/viewport-highlighter/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/dleerdefi/claude-code-construction/viewport-highlighter"><img src="https://agentmods.dev/badge/skills/dleerdefi/claude-code-construction/viewport-highlighter.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 | $0.00057 | $0.04633 |
| Opus 5 | $0.00028 | $0.02316 |
| Sonnet 5 | $0.00011 | $0.00927 |
| Haiku 4.5 | $0.00006 | $0.00463 |
Grade A, and why
viewport-highlighter scanned grade A with 1 finding 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 9d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -s --fail-with-body -X POST "{api_url}/projects/{project_id}/viewport-suggestions/ingest" \ How it starts
The opening of the file, as written. The whole thing — 486 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Viewport Highlighter
Purpose
Automate viewport segmentation of construction drawing sheets. Each sheet typically contains 1-12+ distinct views (floor plans, sections, elevations, details, schedules). This skill identifies all views, determines their boundaries, extracts metadata (title, detail number, scale, type), and creates viewport highlights — producing the same result as a user manually drawing and labeling each viewport in the UI.
Does NOT: modify existing viewports, delete viewports, or change element data. Only creates new viewport highlights and populates their metadata.
Step 0: Verify AgentCM Mode
This skill requires AgentCM. It writes viewport overlays through the AgentCM REST API and has no standalone output path.
Check for .construction/ directory at the project root.
If .construction/ is absent, stop immediately and tell the user:
"viewport-highlighter requires an AgentCM project —
.construction/directory not found. This skill submits viewport overlays through the AgentCM API and cannot operate without it. Open this project in AgentCM first, then re-run."
If .construction/ exists:
- Read
.construction/CLAUDE.mdfor project context - Read
.construction/database.yamlforquery_command,project_id,api_url - Read
.construction/index/sheet_index.yamlfor sheet inventory - Sheet images at
.construction/rasters/{sheet_number}.png - OCR data queryable via
extracted_itemstable in PostgreSQL - Write viewports via REST API
Step 1: User Scopes the Task
User provides sheet scope:
- Specific sheets: "A2.01, A2.02, A5.01"
- By discipline: "all architectural sheets"
- All sheets: "every sheet in the set"
Optional: user can specify which view types to look for (e.g., "only floor plans and sections"). Default: identify ALL views on each sheet.
Before proceeding: Confirm the sheet list and any filters with the user. Show the count of sheets to process.
Step 2: Vision — Identify View Boundaries
What ships with it
3 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.
- 9d ago First seen · 486 lines · 57 tokens per session scan A b4ab069535b3
viewport-highlighter is a skill published in the GitHub repository dleerdefi/claude-code-construction (37 stars, last pushed 4mo ago), licensed MIT. It adds 57 tokens to every session and 4,633 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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