Borrowing it
Nothing to install: this file belongs to Quevin/mcp-dayone. 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/Quevin/mcp-dayone/main/CLAUDE.mdgit clone --depth 1 https://github.com/Quevin/mcp-dayoneWrote 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/quevin/mcp-dayone/claude-md)<a href="https://agentmods.dev/instructions/quevin/mcp-dayone/claude-md"><img src="https://agentmods.dev/badge/instructions/quevin/mcp-dayone/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/quevin/mcp-dayone/claude-md"><img src="https://agentmods.dev/badge/instructions/quevin/mcp-dayone/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 | $0.01537 | $0.01537 |
| Opus 5.5 | $0.00615 | $0.00615 |
| Sonnet 5.5 | $0.00307 | $0.00307 |
| Haiku 4.5 | $0.00154 | $0.00154 |
Grade A, and why
mcp-dayone 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 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.
How it starts
The opening of the file, as written. The whole thing — 133 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md
This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
Overview
This is a comprehensive MCP (Message Control Protocol) server that provides full read/write integration between Claude Desktop and Day One Journal. The server implements the MCP protocol with 10 specialized tools for creating, reading, and searching journal entries with rich metadata support.
Project Status - Production Ready
Current Phase: Full-featured production deployment ✅
Progress: Complete read/write functionality with advanced features
Recent Completed Features:
- ✅ Enhanced Text Extraction: Comprehensive rich text JSON parsing from Day One's complex format
- ✅ "On This Day" Feature: Date-based historical entry retrieval across multiple years
- ✅ Direct Database Access: SQLite integration for reading Day One's Core Data database
- ✅ Hybrid Architecture: CLI for writing, database for reading operations
- ✅ 10 MCP Tools: Complete toolkit for journal management
- ✅ Advanced Attachments: Support for photos, videos, audio, PDFs (up to 10 per entry)
- ✅ Location Integration: GPS coordinates and location-aware entries
- ✅ Rich Metadata: Tags, starred entries, timezone support, all-day events
Architecture
Production Python MCP Structure:
- src/mcp_dayone/server.py: Main MCP server with 10 tool handlers and proper error handling
- src/mcp_dayone/tools.py: Hybrid Day One operations:
- CLI wrapper for write operations (create_entry, attachments, location)
- SQLite database access for read operations (Core Data schema)
- Text extraction engine for Day One's rich text JSON format
- pyproject.toml: Python project dependencies and configuration
- docs/: Documentation and examples
Key Implementation Details:
- Database Path:
~/Library/Group Containers/5U8NS4GX82.dayoneapp2/Data/Documents/DayOne.sqlite - Core Data Schema: Uses Z-prefixed tables (ZENTRY, ZJOURNAL, ZTAG, Z_13TAGS)
- Timestamp Conversion: Core Data timestamps (seconds since 2001-01-01) + 978307200
- Rich Text Parsing: Handles multiple JSON formats (attributedString, ops, delta, NSString)
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 · 133 lines · 1,537 tokens per session scan A df6682acbf02
mcp-dayone CLAUDE.md is an instructions file published in the GitHub repository Quevin/mcp-dayone (19 stars, last pushed 1y ago), licensed MIT. It adds 1,537 tokens to every session, about $0.0061 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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