What is TablaCognita CLAUDE.md?

Repository instructions for TablaCognita, a collaborative Markdown editor with a browser editor, a Node.js relay, and AI connections through MCP.

Use them when developing or testing the editor, WebSocket relay, MCP tools, sessions, document sections, locks, notifications, or shared protocol.

They give developers the startup commands, architecture, component responsibilities, and rules that keep document editing synchronized.

How PStryder/TablaCognita configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to PStryder/TablaCognita. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/PStryder/TablaCognita/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/PStryder/TablaCognita

Made for: Claude Code.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/pstryder/tablacognita/claude-md/github.svg)](https://agentmods.dev/instructions/pstryder/tablacognita/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/pstryder/tablacognita/claude-md"><img src="https://agentmods.dev/badge/instructions/pstryder/tablacognita/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/pstryder/tablacognita/claude-md"><img src="https://agentmods.dev/badge/instructions/pstryder/tablacognita/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 482 This file is loaded in full into every session.

When invoked 482 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00482	$0.00482
Opus 5	$0.00241	$0.00241
Sonnet 5	$0.00096	$0.00096
Haiku 4.5	$0.00048	$0.00048

Measured 8d ago against content hash 3d73c63a4631, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

TablaCognita 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.

CLAUDE.md · 54 lines

What it actually says

TablaCognita

MCP-native collaborative markdown editor. Three components:

Editor (browser): CodeMirror 6, single source of truth, all doc state
Relay (Node.js): Stateless MCP↔WebSocket bridge
AI Client: Any MCP-capable app

Quick Start

npm install
npm test          # 122 tests
npm start         # Starts relay (stdio MCP) + editor server on :3000

Architecture

server/index.js    — MCP server + Express + WebSocket relay entry point
server/relay.js    — WebSocket relay, request/response correlation
server/sessions.js — Session management (1 session = 1 browser tab = 1 MCP client)
server/tools.js    — MCP tool definitions and handlers

shared/protocol.js      — Message types, error codes, constants
shared/sections.js      — Section parser (heading-based + I10 paragraph fallback)
shared/fuzzy.js         — 4-level fuzzy matching (exact → ws-normalized → md-stripped → Levenshtein)
shared/locks.js         — Lock state machine (explicit + auto, TTL, owner tracking)
shared/notifications.js — Notification debouncing and validation

editor/app.js      — Browser editor: CodeMirror 6, WebSocket client, request handlers
editor/index.html  — Editor shell with importmap for ESM CDN
editor/styles.css  — Dark theme

test/              — Node.js test runner, no deps needed

Key Invariants (from DESIGN.md)

I1: Browser is single source of truth (relay holds zero doc state)
I2: Section IDs stable across renames
I3: Locks have bounded lifetime (max 120s)
I4: One session = one browser tab = one MCP client
I5: Dirty flags reset only on get_section()
I8: Auto-lock is atomic with the edit
I9: Agent edits are undoable (CM6 transactions)
I10: Headingless docs get implicit paragraph sections

Development

Pure ESM ("type": "module")
Node.js 18+, no build step
Tests: node --test test/*.test.js
shared/ modules work in both Node.js and browser

Changes

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 · 54 lines · 482 tokens per session scan A 3d73c63a4631

Subscribe to this mod's changes

TablaCognita CLAUDE.md is an instructions file published in the GitHub repository PStryder/TablaCognita (2 stars, last pushed 6mo ago), licensed Apache-2.0. It adds 482 tokens to every session, about $0.0024 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 2026-08-31.

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TablaCognita: Instructions file for Claude Code