Borrowing it
Nothing to install: this file belongs to nestordemeure/lantern-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/nestordemeure/lantern-mcp/main/CLAUDE.mdgit clone --depth 1 https://github.com/nestordemeure/lantern-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/nestordemeure/lantern-mcp/claude-md)<a href="https://agentmods.dev/instructions/nestordemeure/lantern-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/nestordemeure/lantern-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/nestordemeure/lantern-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/nestordemeure/lantern-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 | $0.02300 | $0.02300 |
| Opus 5 | $0.01150 | $0.01150 |
| Sonnet 5 | $0.00460 | $0.00460 |
| Haiku 4.5 | $0.00230 | $0.00230 |
Grade A, and why
lantern-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 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 — 99 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Lantern MCP Server
A CLI and an MCP server for Lantern, the full-text index of the digitised entertainment trade press of the Media History Digital Library. It needs no key, it resolves to a page, and the search response holds the keyword in context.
Stack
- Python ≥3.12, uv, fastMCP ≥2.0.0, httpx ≥0.27.0
Functions
- A full-text search at leaf level, with the extract in the search response
- Filters for the year range, the collection, the publication title, the format and the language
- A facet listing, so that you can give a full-string filter value exactly
- An OCR text download for each leaf, taken out of a cached derivative of the full volume
- Pagination at up to 100 results for each request
Structure
lantern-mcp/
├── .claude/skills/lantern-search/ # Skill documenting the CLI
├── src/lantern_mcp/
│ ├── __init__.py
│ ├── client.py # API client + caching
│ ├── cli.py # `lantern` command-line interface
│ ├── paths.py # Cache location resolution
│ ├── ratelimit.py # Cross-process request pacing
│ ├── server.py # FastMCP tools
│ └── install.py # MCP server installer
├── pyproject.toml
└── CLAUDE.md # This file
client.py holds all the behaviour. server.py and cli.py are thin presentation layers over it, so the search semantics and the cache stay identical for each method of access. The CLI shows each filter without a condition. The MCP server hides them behind --enable-advanced-search.
Two hosts, one client
Lantern indexes text that it does not hold. The search and the facets come from lantern.mediahist.org. The OCR comes from archive.org. The same limiter paces both hosts.
| Service | URL | Returns |
|---|---|---|
| Search | https://lantern.mediahist.org/catalog.json |
JSON:API |
| Facet values | https://lantern.mediahist.org/catalog/facet/<field>.json |
JSON |
| Item file listing | https://archive.org/metadata/<item> |
JSON |
| OCR derivative | https://archive.org/download/<item>/<file> |
gzip or XML |
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 First seen · 99 lines · 2,300 tokens per session scan A 6e6fbec46693
lantern-mcp CLAUDE.md is an instructions file published in the GitHub repository nestordemeure/lantern-mcp (0 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 2,300 tokens to every session, about $0.0115 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 2026-09-01.
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