canvas

canvas is a command for Claude Code from dvdsgl/claude-canvas. It costs 15 tokens per session (517 once invoked), scanned A, original, MIT.

A command for opening interactive terminal displays, called canvases, for calendars, Markdown documents, or flight choices.

In plain words
What is it for?
Use it to display events and meeting slots, view or edit Markdown with optional differences, or compare flights and choose seats.
Why use it?
It gives you a focused screen for viewing, editing, comparing, or selecting information instead of handling everything as plain terminal text.

Command for Claude Code

Written for Claude Code: ${CLAUDE_PLUGIN_ROOT} variable.

Runs only inside its plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else. Install the plugin, not this.

Part of the canvas plugin — 4 skills, 1 command shipped together

Good fit Use it to display events and meeting slots, view or edit Markdown with optional differences, or compare flights and choose seats.

Compare 6 commands from other repositories ↓
About the project

Claude Canvas is a terminal user-interface toolkit that gives Claude Code an interactive display separate from its main session. It is for spawning terminal interfaces for tasks such as managing email, calendars, flights, and bookings.

dvdsgl/claude-canvas · 1,516 stars · on GitHub

Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code
/plugin marketplace add dvdsgl/claude-canvas
Claude Code
/plugin install canvas

Made for: Claude Code.

Or install canvas, the plugin that ships this one along with the rest of its 4 skills, 1 command.

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.

agentmods badge for canvas

README.md
[![agentmods](https://agentmods.dev/badge/commands/dvdsgl/claude-canvas/canvas/github.svg)](https://agentmods.dev/commands/dvdsgl/claude-canvas/canvas)
Your own site
<a href="https://agentmods.dev/commands/dvdsgl/claude-canvas/canvas"><img src="https://agentmods.dev/badge/commands/dvdsgl/claude-canvas/canvas/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.

agentmods 80×15 button for canvas

Your own site · 80×15
<a href="https://agentmods.dev/commands/dvdsgl/claude-canvas/canvas"><img src="https://agentmods.dev/badge/commands/dvdsgl/claude-canvas/canvas.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 15 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 517 The whole file, excluding the scripts and references it only reads on demand.
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00015 $0.00517
Opus 5.5 $0.00006 $0.00207
Sonnet 5.5 $0.00003 $0.00103
Haiku 4.5 $0.00002 $0.00052

Measured 2mo ago against content hash 51ec7f86e752, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

canvas 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.

canvas/commands/canvas.md · 90 lines

How it starts

The opening of the file, as written. The whole thing — 90 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Canvas Command

Spawn and control interactive terminal displays (TUIs) in tmux split panes.

Usage

When the user invokes /canvas, help them spawn the appropriate canvas type based on their needs.

Workflow

Step 1: Determine Canvas Type

Ask what kind of canvas the user needs:

  • Calendar - Display events or pick meeting times
  • Document - View or edit markdown content
  • Flight - Compare flights and select seats

Step 2: Gather Configuration

Based on the canvas type, collect the necessary configuration:

Calendar:

  • Events to display (title, start/end times)
  • For meeting picker: multiple calendars with busy times
  • Slot granularity (15/30/60 minutes)

Document:

  • Markdown content to display
  • Document title
  • Edit mode or display-only
  • Optional diff highlighting

Flight:

  • Flight options (airline, times, prices)
  • Seatmap configuration
  • Origin/destination airports

Step 3: Spawn Canvas

Use the CLI to spawn the canvas:

cd ${CLAUDE_PLUGIN_ROOT}
bun run src/cli.ts spawn [type] --scenario [scenario] --config '[json]'

Examples:

# Calendar display
bun run src/cli.ts spawn calendar --config '{"events": [...]}'

# Meeting picker
bun run src/cli.ts spawn calendar --scenario meeting-picker --config '{"calendars": [...]}'

# Document editor
bun run src/cli.ts spawn document --scenario edit --config '{"content": "# Title", "title": "Doc"}'

# Flight booking
bun run src/cli.ts spawn flight --config '{"flights": [...]}'

Step 4: Handle Results

Wait for user interaction and handle the result:

  • Selected: User made a selection (time slot, text, flight+seat)
  • Cancelled: User pressed Escape or quit
  • Error: Something went wrong

Requirements

  • Must be running inside a tmux session
  • Terminal should support mouse input for interactive scenarios

Skills Reference

Read these skills for detailed configuration options:

  • canvas - Overview and IPC communication
  • calendar - Calendar events and meeting picker
  • document - Markdown rendering and text selection
  • flight - Flight comparison and seatmaps

Read the full file on GitHub · 90 lines

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.

  1. 2mo ago First seen · 90 lines · 15 tokens per session scan A 51ec7f86e752

Subscribe to this mod's changes

canvas is a command published in the GitHub repository dvdsgl/claude-canvas (1,516 stars, last pushed 10mo ago), licensed MIT. It adds 15 tokens to every session and 517 once invoked, about $0.0001 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.

Related

canvas compared with commands from other repositories

canvas next to 6 commands from other repositories
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canvasdvdsgl/claude-canvasCommand1.5k10mo agoMITA15Claude Code
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engage.actionshypnguyen1209/offensive-claudeCommand41215d agoMITA11Claude Code
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