Penlog
About
Penlog turns your handwritten Apple Pencil journal into structured tasks and notes your AI can read and write back to, over MCP.
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- Author
- Unknown
- Categories
- Productivity, Other, AI
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Penlog is a handwriting app for iPad. You write by hand with Apple Pencil; Penlog OCRs each page into structuredstructure_json— typed lines with sections, notation, and task status. That structure is what makes your handwritingaddressable: any MCP-compatible agent can read your pages and write typed blocks and tasks back alongside your ink.
These docs are for people building on top of that — connecting an existing agent (Claude, ChatGPT, a CLI client) or authoring their own integration.
- You write ink. Agents write typed blocks.The two never collide — ink is yours alone, so there are no merge conflicts by design.
- Every page is a resource.A page is identified by its journal and date, and exposes its OCR'd lines, tasks, and events.
- Notation drives structure.The symbols you draw — a bullet, a circle, a dash — deterministically map to sections and status. Agents read the result, they don't have to guess.
Quickstart Add Penlog as a connector via one-click OAuth.MCP tool reference The six v1 tools, with input/output schemas and examples.Notation & structure_json How handwriting becomes structured, addressable lines.Data model Journals, pages, blocks, tasks, events, and seeds.Connector authoring The ConnectorService protocol and how Notion / Calendar plug in.Agent recipes Morning brief, weekly-review harvest, seed-from-agent.Remote MCP clients mcp.json + bearer token for CLI and self-hosted clients.Troubleshooting Connection, auth, Pro-gate, and empty-result issues, and how to fix them.
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