Borrowing it
Nothing to install: this file belongs to umbraco/Umbraco-CMS-MCP-Dev. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/umbraco/Umbraco-CMS-MCP-Dev/main/CLAUDE.mdgit clone --depth 1 https://github.com/umbraco/Umbraco-CMS-MCP-DevWrote 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/instructions/umbraco/umbraco-cms-mcp-dev/claude-md)<a href="https://agentmods.dev/instructions/umbraco/umbraco-cms-mcp-dev/claude-md"><img src="https://agentmods.dev/badge/instructions/umbraco/umbraco-cms-mcp-dev/claude-md/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/instructions/umbraco/umbraco-cms-mcp-dev/claude-md"><img src="https://agentmods.dev/badge/instructions/umbraco/umbraco-cms-mcp-dev/claude-md.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 | $0.01872 | $0.01872 |
| Opus 5.5 | $0.00749 | $0.00749 |
| Sonnet 5.5 | $0.00374 | $0.00374 |
| Haiku 4.5 | $0.00187 | $0.00187 |
Grade A, and why
Umbraco-CMS-MCP-Dev CLAUDE.md 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 8d 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 — 149 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Umbraco CMS MCP — Repository Conventions
This file is the canonical conventions source for build agents and MCP tooling.
The detailed rules live in .rulesync/rules/*.md; this file summarises the
build/test/tooling conventions and points at them.
Rule references
.rulesync/rules/cursor-mcp.md— MCP development guide (tools, resources, Umbraco API integration).rulesync/rules/cursor-mcp-testing.md— testing guide (builders, helpers, snapshot testing).rulesync/rules/cursor-model-context-provider-typescript.md— MCP TypeScript SDK reference.rulesync/rules/cursor-project-context.md— project context and background.rulesync/rules/schema-flattening-addition-for-folders.md— folder schema flattening notes
Project layout
- MCP tools live at
src/umbraco-api/tools/, grouped by entity and REST verb (get/post/put/delete). - The Orval-generated Umbraco Management API client lives at
src/umbraco-api/api/. - The Orval config is
src/umbraco-api/orval/umbraco-api.ts(wrapped by the rootorval.config.ts). - Path aliases:
@/umbraco-api/*→src/umbraco-api/api/*;@umb-management-client→src/umbraco-api/umbraco-management-client.ts.
Releasing: version-bearing files
A release bumps the version in exactly these files. Bump all of them, and nothing else:
package.json:versionpackage-lock.json:versionandpackages[""].versionserver.json:versionandpackages[0].version.claude-plugin/marketplace.json:metadata.versionandplugins[0].versionplugins-server/.claude-plugin/plugin.json:version
Check after bumping: git grep -nF "<previous version>" -- . ':!**/__snapshots__/**'
should find nothing.
Build / test / tooling
npm run compile— tsc type-check (safe to run anytime).npm run build— tsup build.npm run generate— regenerate the Orval client (requires Umbraco running, plusUMBRACO_BASE_URL/UMBRACO_CLIENT_ID/UMBRACO_CLIENT_SECRETin.env— the SDK's target-major transformer reads the instance's version to stampsrc/config/umbraco-target.generated.ts, and fails the run if it can't).npm test— integration/unit suite (requires Umbraco running).npm run test:one -- <path-to-test>— run a single test file (--runInBand --forceExit, no path pattern).npm run test:evals— eval tests (requires Umbraco running).npm run test:all— full pass:build+ integration (test) +test:evals.npm run start:umbraco— alias ofnpm run umbraco:start; starts the demo-site Umbraco instance.
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.
- 8d ago Changed · +13 lines · +135 tokens per session 952bc44935cb
- 2mo ago First seen · 136 lines · 1,737 tokens per session scan A 909011172b6e
Umbraco-CMS-MCP-Dev CLAUDE.md is an instructions file published in the GitHub repository umbraco/Umbraco-CMS-MCP-Dev (39 stars, last pushed yesterday), licensed MIT. It adds 1,872 tokens to every session, about $0.0075 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 2026-08-30.
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