Borrowing it
Nothing to install: this file belongs to Automaat/lightroom-mcp. 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/Automaat/lightroom-mcp/main/CLAUDE.mdgit clone --depth 1 https://github.com/Automaat/lightroom-mcpWrote 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/automaat/lightroom-mcp/claude-md)<a href="https://agentmods.dev/instructions/automaat/lightroom-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/automaat/lightroom-mcp/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/automaat/lightroom-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/automaat/lightroom-mcp/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 | $0.01368 | $0.01368 |
| Opus 5 | $0.00684 | $0.00684 |
| Sonnet 5 | $0.00274 | $0.00274 |
| Haiku 4.5 | $0.00137 | $0.00137 |
Grade A, and why
lightroom-mcp 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 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.
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 — 77 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Lightroom MCP
MCP server bridging Claude to Adobe Lightroom Classic.
Layout
server/— TypeScript MCP server (ESM, NodeNext). Stdio transport for Claude + raw TCP client to plugin sockets.plugin/LightroomMCP.lrplugin/— Lua plugin loaded by Lightroom Classic.manual-test.mjs— direct TCP probe (bypasses MCP) for validating plugin dispatch.
Architecture (read before changing transport)
Plugin opens two LrSocket binds as servers; MCP server connects to both.
- Plugin :58763 (default) in
mode='receive'— server writes line-delimited JSON requests - Plugin :58764 (default) in
mode='send'— server reads line-delimited JSON responses - Frame:
\nterminator on every message (LrSocket buffers until newline) - Plugin allows one client per port at a time. MCP server holds a persistent connection.
LrSocket.bindinmode='receive'has a 10s no-client timeout that firesonError. Plugin auto-calls:reconnect()from a monitor loop in response. Reconnect storms are prevented by setting flags in callbacks and acting on them in the loop (never:reconnect()synchronously fromonError).onMessageruns in non-yielding context — handler dispatch must be wrapped inLrTasks.startAsyncTasksocatalog:withReadAccessDocan yield.- Catalog queries that yield (
getTargetPhotos,findPhotos) must run outsidewithReadAccessDo. Nesting a yielding query inside the read gate deadlocks on Windows: the task yields to the UI thread holding the gate, never returns, never releases it, wedging the bridge until the server timeout (#124/#134). Only non-yielding per-photo metadata reads belong inside the gate.getAllPhotosis a non-yielding enumeration, safe either side. Specs guard this viagetQueriedInsideReadAccess()inspec_helper.
Pattern verified against MIDI2LR (rsjaffe/MIDI2LR, see src/plugin/Client.lua) — same dual-port LrSocket model, ports 58763/58764 also chosen there.
Commands
Use mise tasks from repo root:
mise run install— npm ci inserver/mise run build—tsc(outputsserver/dist/)mise run test— Jest (ESM via ts-jest)mise run dev—tsc --watchmise run lua:lint—selene plugin/LightroomMCP.lrpluginmise run lua:test—bustedspecs for the pluginmise run skill:test— Python unittest for bundled skill scripts
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 · 77 lines · 1,368 tokens per session scan A 1b78980a6ef0
lightroom-mcp CLAUDE.md is an instructions file published in the GitHub repository Automaat/lightroom-mcp (78 stars, last pushed yesterday), licensed MIT. It adds 1,368 tokens to every session, about $0.0068 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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