canvas-sync

canvas-sync is a skill for Claude Code, Codex from haabe/mycelium. It costs 24 tokens per session (405 once invoked), scanned A, original, MIT.

A Git-based workflow for keeping shared product knowledge consistent between team sessions. Git is a version-control system that records file changes and helps people combine work.

In plain words
What is it for?
Use it when starting or ending a session, after product decisions change, or when canvas files conflict. It pulls updates, reviews changes, and commits shared canvas and decision files.
Why use it?
It reduces the chance that team members work from outdated product information or lose changes made by others. It also provides a process for handling conflicting edits.

Skill for Claude CodeCodex

Part of the mycelium plugin — 54 skills, 6 hooks shipped together

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 skills/haabe/mycelium/canvas-sync
Any agent
npx skills add haabe/mycelium --skill canvas-sync
Clone the repo
git clone --depth 1 https://github.com/haabe/mycelium

Made for: Claude Code, Codex.

Or install mycelium, the plugin that ships this one along with the rest of its 54 skills, 6 hooks.

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-sync

README.md
[![agentmods](https://agentmods.dev/badge/skills/haabe/mycelium/canvas-sync.svg)](https://agentmods.dev/skills/haabe/mycelium/canvas-sync)
Your own site
<a href="https://agentmods.dev/skills/haabe/mycelium/canvas-sync"><img src="https://agentmods.dev/badge/skills/haabe/mycelium/canvas-sync.svg" alt="Measured on agentmods" height="20"></a>
Per session 24 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 405 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 $0.00024 $0.00405
Opus 5 $0.00012 $0.00202
Sonnet 5 $0.00005 $0.00081
Haiku 4.5 $0.00002 $0.00040

Measured 4d ago against content hash 8627804b3360, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

canvas-sync 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 4d 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.

plugins/mycelium/skills/canvas-sync/SKILL.md · 40 lines

What it actually says

Canvas Sync

When to Use

  • Starting a new session (pull latest canvas)
  • Ending a session (commit canvas changes)
  • After team discussion that changes product direction
  • When canvas conflicts arise from parallel work

Workflow

Pull Latest

git pull origin main

Then run /mycelium:diamond-assess to see what changed.

Commit Changes

git add .claude/canvas/ .claude/harness/decision-log.md .claude/memory/
git commit -m "canvas: [brief description of what changed and why]"

Conflict Resolution

  • Different canvas files: auto-merges (no conflict)
  • Same file, different sections: usually auto-merges
  • Same field conflicting: the person with more evidence wins — a manual resolution heuristic for the team, not an automated merge. No tooling evaluates evidence weight; Gated by: a /canvas-merge procedure (read both versions, compare provenance depth on overlapping entries, recommend) — not yet built.
  • When uncertain: discuss as team, log decision

GitOps Principle

The canvas system IS GitOps for product knowledge — git is the single source of truth, changes are declarative (YAML), and updates flow through version control with review. For infrastructure GitOps (ArgoCD, Flux), see JiT tooling detection for Kubernetes/infrastructure-as-code projects.

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. 4d ago First seen · 40 lines · 24 tokens per session scan A 8627804b3360

Subscribe to this mod's changes

canvas-sync is a skill published in the GitHub repository haabe/mycelium (45 stars, last pushed today), licensed MIT. It adds 24 tokens to every session and 405 once invoked, about $0.0001 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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