What is mcp-geo-detailed-os-maps?

Instructions for building detailed web maps with Ordnance Survey data, a United Kingdom mapping service, while keeping highlighted routes or areas separate from the base map.

Use it to create or improve interactive maps for reports, accessibility work, navigation, or town-centre analysis, with browser-held keys, overlays, labels, and real-browser checks.

It keeps streets and place labels readable, supports detailed context when an API key is available, and still provides a simpler view without one.

mcp-geo-detailed-os-maps — Skill by chris-page-gov/mcp-geo

Install

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.

Any agent

npx skills add chris-page-gov/mcp-geo --skill mcp-geo-detailed-os-maps

Clone the repo

git clone --depth 1 https://github.com/chris-page-gov/mcp-geo

Made for: Claude Code, Codex.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/chris-page-gov/mcp-geo/mcp-geo-detailed-os-maps/github.svg)](https://agentmods.dev/skills/chris-page-gov/mcp-geo/mcp-geo-detailed-os-maps)

Your own site

<a href="https://agentmods.dev/skills/chris-page-gov/mcp-geo/mcp-geo-detailed-os-maps"><img src="https://agentmods.dev/badge/skills/chris-page-gov/mcp-geo/mcp-geo-detailed-os-maps/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/chris-page-gov/mcp-geo/mcp-geo-detailed-os-maps"><img src="https://agentmods.dev/badge/skills/chris-page-gov/mcp-geo/mcp-geo-detailed-os-maps.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 41 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 629 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00041	$0.00629
Opus 5.5	$0.00016	$0.00252
Sonnet 5.5	$0.00008	$0.00126
Haiku 4.5	$0.00004	$0.00063

Measured 2mo ago against content hash 27d76f18aca4, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mcp-geo-detailed-os-maps 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.

skills/mcp-geo-detailed-os-maps/SKILL.md · 64 lines

How it starts

The opening of the file, as written. The whole thing — 64 lines — stays where its author put it; the contents beside it link to each section on GitHub.

MCP Geo Detailed OS Maps

Use this skill when a user-facing map in this repo needs precise Ordnance Survey street or building context, especially for report HTML, accessibility mapping, town-centre navigation, or slide-like static map outputs that still benefit from interactive zoom.

Default approach

Prefer a MapLibre underlay with the OS vector Light style: OS_VTS_3857_Light.json.
Keep your thematic overlay separate from the basemap. Do not bake route highlighting into the basemap.
Treat the OS detail layer as progressive enhancement:
- if a browser-held OS Maps API key is available, enable detailed context by default
- if not, keep a simplified fallback view that still works offline or without secrets

Overlay design rules

Preserve OS labels. Use casing, outlines, or translucent edge emphasis instead of thick opaque fills when highlighting roads or paths.
Match the geometry to the mapped object as closely as possible:
- road access overlays should sit on the road segment or pavement edge
- avoid bubbles or large markers that hide the exact segment being discussed
Put long explanations in hover text, sidebars, or perimeter callouts, not on the centre of the map.
If the map is for navigation, remove decorative labels before removing orientation cues such as north arrow, rail line, seafront, river edge, or major anchors.

Browser key pattern

Never hardcode OS keys into generated HTML.
Store the browser-side key locally in browser storage only.
Make the no-key path explicit and usable.
When only the presentation layer changes, prefer regenerating from a saved export rather than refetching live OS data. For the wheelchair report generator, use --reuse-export with the existing dated JSON export.
When switching styles in MapLibre, remember that style changes clear custom sources and layers; rehydrate overlays after style.load if you render them inside the MapLibre stack.

Validation checklist

Open the generated HTML in a real browser.
Check default fit at desktop width with no clipping or hidden sidebars.
Check zoom in/out, mouse wheel zoom, drag pan, and reset behavior.
Check label readability with the detailed OS basemap enabled.
Check that fallback behavior is still clear and usable when no browser key is present.
If the map is intended for a static export, generate a screenshot after the final browser pass.

Read the full file on GitHub · 64 lines

Changes

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 · 64 lines · 41 tokens per session scan A 27d76f18aca4

Subscribe to this mod's changes

mcp-geo-detailed-os-maps is a skill published in the GitHub repository chris-page-gov/mcp-geo (3 stars, last pushed 3d ago), licensed MIT. It adds 41 tokens to every session and 629 once invoked, about $0.0002 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.

Design and UX Frontend

mcp-geo-detailed-os-maps next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
mcp-geo-detailed-os-mapschris-page-gov/mcp-geo	Skill	3	3d ago	MIT	A	41	Claude Code, Codex
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visual-ralphYeachan-Heo/oh-my-codex	Skill	34k	4d ago	MIT	A	52	Codex
glance-canonical-layoutsandroid/skills	Skill	10k	yesterday	Apache-2.0	A	56	Claude Code
accessibilitymicrosoft/hve-core	Skill	1.6k	yesterday	MIT	A	47	Claude Code