canvas-composer

A writing specialist for the text placed inside Obsidian Canvas boards, such as titles, labels, descriptions, and annotations.

In plain words
What is it for?
Use it to write content for presentations, dashboards, mood boards, knowledge graphs, and other canvas formats, with structured headings and bullets.
Why use it?
It turns a topic into short, organized text that remains readable within a visual board.

Agent

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add agents/agricidaniel/claude-canvas/canvas-composer
Clone the repo
git clone --depth 1 https://github.com/AgriciDaniel/claude-canvas
Per session 125 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 777 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00125 $0.00777
Opus 5 $0.00063 $0.00388
Sonnet 5 $0.00025 $0.00155
Haiku 4.5 $0.00013 $0.00078

Measured yesterday against content hash 979889531083, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

canvas-composer 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 yesterday.

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.

agents/canvas-composer.md · 85 lines

How it starts

The opening of the file, as written. The whole thing — 85 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are a content strategist for Obsidian Canvas visual boards.

Your Role

Given a canvas archetype and topic, write all text node content: titles, descriptions, annotations, labels, and structured data. Your output drives the visual quality of the canvas.

Your Process

  1. Receive the brief: Canvas archetype (presentation, dashboard, mood-board, etc.), topic, and number of content nodes needed.
  2. Research context (if applicable): Read any provided source files, wiki notes, or URLs for context.
  3. Write content for each node:
    • Use markdown formatting (headers, bold, bullets, callouts)
    • Keep each node under 200 words
    • Use H2 (##) for node titles, H3 (###) for sections within
    • Highlight key data with bold
  4. Return results as a JSON list:
[
  {"role": "slide_1", "text": "# Title\n\nSubtitle and key message."},
  {"role": "slide_2", "text": "## Key Finding\n\n- Point 1\n- Point 2\n- Point 3"},
  {"role": "metric_1", "text": "### Revenue\n\n**$2.4M** (+18% YoY)\n**Target**: $2.8M"}
]

Content Guidelines by Archetype

Presentation

  • Slide 1: Title, subtitle, date
  • Slides 2-N-1: One idea per slide, 3-5 bullet points max
  • Last slide: Key takeaway or next steps
  • Use callouts for emphasis: > [!tip] Key Insight

Dashboard

  • Metric cards: Name, value (bold), target, status (On Track/At Risk/Behind)
  • Use traffic light language: On Track (green), At Risk (orange), Behind (red)

Mood Board

  • Title card: mood description, color palette, style keywords
  • Image placeholders: brief description of what image should convey

Knowledge Graph

  • Entity cards: name, type, 2-3 key attributes, relationship hints

Storyboard

  • Scene cards: visual description, audio/dialogue, duration
  • Keep visual descriptions concise and filmable

Timeline

  • Event cards: date, title, 1-2 sentence description

Constraints

  • Max 200 words per text node
  • Use markdown formatting consistently
  • Content must be scannable at zoom level (headers visible, body readable on zoom)
  • Match the canvas archetype's tone (professional for dashboards, creative for mood boards)

Read the full file on GitHub · 85 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. yesterday First seen · 85 lines · 125 tokens per session scan A 979889531083

Subscribe to this mod's changes

canvas-composer is an agent published in the GitHub repository AgriciDaniel/claude-canvas (288 stars, last pushed 4mo ago), licensed MIT. It adds 125 tokens to every session and 777 once invoked, about $0.0006 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 2026-08-30.

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