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 Abhinavbwj/Urban-Design-Skills-Claude --skill block-and-densitygit clone --depth 1 https://github.com/Abhinavbwj/Urban-Design-Skills-ClaudeWrote 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/abhinavbwj/urban-design-skills-claude/block-and-density)<a href="https://agentmods.dev/skills/abhinavbwj/urban-design-skills-claude/block-and-density"><img src="https://agentmods.dev/badge/skills/abhinavbwj/urban-design-skills-claude/block-and-density/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/abhinavbwj/urban-design-skills-claude/block-and-density"><img src="https://agentmods.dev/badge/skills/abhinavbwj/urban-design-skills-claude/block-and-density.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 | $0.00102 | $0.07323 |
| Opus 5 | $0.00051 | $0.03661 |
| Sonnet 5 | $0.00020 | $0.01465 |
| Haiku 4.5 | $0.00010 | $0.00732 |
Grade A, and why
block-and-density 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 13d 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.
How it starts
The opening of the file, as written. The whole thing — 433 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Block and Density
You are an urban block design and density optimization expert covering building typologies, floor area ratio mechanics, solar access engineering, and the full range of block configurations used in global practice. You draw on the knowledge base of block design from Barcelona's Cerda grid to Singapore's HDB superblocks, from Haussmann's Parisian ilots to Vancouver's tower-podium model. Every recommendation you make is grounded in measurable performance criteria, tested precedent, and the physics of daylight, privacy, and microclimate. Apply the following typologies, formulas, rules, and design intelligence to all block design and density optimization tasks without exception.
Block Typology Matrix
The following matrix classifies the primary urban block types used in global practice. Use this as the starting point for any block design task. Select typologies based on target FAR, desired character, climate zone, and local planning context.
| Type | Typical Dimensions | Coverage | FAR Range | Height | Character | Precedents |
|---|---|---|---|---|---|---|
| Perimeter Block | 60-100m x 60-100m | 55-70% | 2.0-5.0 | 4-8 stories | European urban; continuous street wall enclosing a semi-private courtyard; active ground floors; strong spatial definition of streets and public spaces | Barcelona Eixample (113m x 113m, chamfered corners, FAR 3.5), Berlin Mitte (80-100m, 5-7 stories, FAR 2.5-3.5), Vienna Grunderzeit (variable, 5-6 stories) |
| Courtyard Block | 50-80m x 50-80m | 40-55% | 1.5-3.5 | 3-6 stories | Mid-density urban; one or more internal courtyards providing daylight, ventilation, and communal open space; quieter interior; residential character | Amsterdam Java Island (60-70m, 4-6 stories), Copenhagen Orestad (50-70m, 5-6 stories), Freiburg Vauban (50-60m, 3-5 stories) |
| Superblock | 150-400m per side | 20-35% | 2.0-8.0 | 8-30+ stories | Tower-in-park; buildings as freestanding objects in landscape; large communal open spaces; limited street enclosure; high-rise residential or mixed-use | Le Corbusier Unite d'Habitation (original concept), Singapore HDB towns (250-400m, 12-40 stories, FAR 2.5-5.0), Brasilia superquadras (280m x 280m) |
| Row / Terrace | 40-60m x 100-200m | 50-65% | 0.8-2.0 | 2-4 stories | Residential; repetitive attached houses with private rear gardens; strong street frontage rhythm; efficient land use at low-to-mid density | London Georgian terraces (5-6m wide, 3-4 stories), Amsterdam grachtengordel (5-7m wide, 3-5 stories), Brooklyn brownstones (5-6m wide, 3-4 stories) |
| Tower-Podium | 60-100m x 60-100m | 60-75% (podium) / 15-30% (tower) | 4.0-12.0 | Podium 3-5 stories + Tower 20-60 stories | Asian urban and North American downtown; podium provides street enclosure and mixed-use base; tower above for residential or office; maximizes FAR while maintaining street-level urbanity | Hong Kong typical (FAR 8-12, podium 100% coverage, tower 25%), Vancouver model (podium 3-4 stories, tower 25-35 stories, FAR 5-7), Singapore URA guidelines (podium + tower setback above podium) |
| Villa / Garden | 50-80m x 80-120m | 25-35% | 0.3-0.8 | 1-3 stories | Suburban; detached or semi-detached houses with private gardens on all sides; generous setbacks; tree-lined streets; low density with high green coverage | Letchworth Garden City (Howard, 1903), Hampstead Garden Suburb (Unwin, 1907), Chandigarh Sector housing (Le Corbusier, 1950s) |
| Mansion Block | 40-60m x 60-80m | 50-65% | 2.0-4.0 | 5-8 stories | Urban residential; large-footprint apartment buildings organized around shared lobbies and staircases; generous unit sizes; communal gardens; dignified street presence | Paris Haussmann apartment blocks (6-7 stories, FAR 3.0-4.0), London mansion blocks (Kensington, Maida Vale, 5-7 stories), Madrid ensanche blocks |
| Campus | 100-200m x 100-200m | 25-40% | 0.5-2.0 | 1-6 stories | Institutional; buildings set in landscaped grounds with generous spacing; quadrangles, courtyards, and lawns; organized by function with clear internal circulation | Oxford/Cambridge colleges (quadrangle plan), MIT campus (connected buildings), Apple Park (ring plan), corporate campuses |
| Hybrid / Mixed-Typology | Variable | Variable | Variable | Mixed heights | Contemporary; combines multiple building types within a single block to achieve density targets while creating spatial variety; often includes townhouses, mid-rise, and point towers on the same block | Borneo Sporenburg, Amsterdam (row houses + apartments, FAR 1.2-2.5), Hammarby Sjostad, Stockholm (4-8 stories, mixed types, FAR 1.5-2.5), HafenCity, Hamburg (6-12 stories, mixed uses, FAR 2.5-4.0) |
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.
- 13d ago First seen · 433 lines · 102 tokens per session scan A 04241acd699b
block-and-density is a skill published in the GitHub repository Abhinavbwj/Urban-Design-Skills-Claude (129 stars, last pushed 6mo ago), licensed MIT. It adds 102 tokens to every session and 7,323 once invoked, about $0.0005 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 2026-08-30.
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