A tool for creating, editing, checking, and packaging diagrams.net (also called draw.io) diagrams as XML files. It can also export diagrams as local images.

Use it to build flowcharts, system diagrams, and other diagrams, make targeted XML changes, work with shape libraries, repair incomplete XML, and export images.

It lets diagrams be maintained as editable files instead of being trapped in screenshots or a visual editor.

flow-skill — Skill by CodingFeng101

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/codingfeng101/canvasanvil/flow-skill

Any agent

npx skills add CodingFeng101/CanvasAnvil --skill flow-skill

Clone the repo

git clone --depth 1 https://github.com/CodingFeng101/CanvasAnvil

Made for: Claude Code, Codex.

Per session 44 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 564 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin unknown 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	$0.00044	$0.00564
Opus 5	$0.00022	$0.00282
Sonnet 5	$0.00009	$0.00113
Haiku 4.5	$0.00004	$0.00056

Measured 2d ago against content hash bdc39c7eddcd, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

flow-skill 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 2d ago.

The scan reads SKILL.md. This mod also ships 4 executable files (scripts/build-flow-bundle.mjs, scripts/build-preview-html.mjs, scripts/export-drawio-image.mjs, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

skill/flow-skill/SKILL.md · 91 lines

The source is not reproduced here

Licensed AGPL-3.0

The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

Files

What ships with it

44 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

2d ago First seen · 91 lines · 44 tokens per session scan A bdc39c7eddcd

Subscribe to this mod's changes

flow-skill is a skill published in the GitHub repository CodingFeng101/CanvasAnvil (92 stars, last pushed 1mo ago), licensed AGPL-3.0. It adds 44 tokens to every session and 564 once invoked, about $0.0002 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.

Data and AI Frontend LLM ai-agents bom cad diagram drawio

drawio-skill

Create, edit, synchronize, inspect, test, and publish editable draw.io diagrams. Use when the user explicitly requests draw.io/diagrams.net, needs a polished architecture, ERD, UML, sequence, C4, SysML, BPMN, network, swimlane, ML, or infrastructure diagram, wants code/IaC/SQL/OpenAPI converted into a diagram, or…

Agents365-ai/drawio-skill · 127 tokens

bruce-drawio

Use this skill when the user wants to create any diagram: flowchart, architecture, UML (sequence/class), ER, mindmap, network topology, or any visual diagram. Trigger words: "draw", "diagram", "flowchart", "architecture", "UML", "sequence diagram", "mindmap", "ER diagram", "network topology", "visualize", "draw.io"…

bruc3van/bruce-drawio · 129 tokens

FlowForge

TRIGGER when: user asks to draw, illustrate, or visualize any process, structure, or concept — "画个流程图", "draw an architecture diagram", "帮我画个对比图", "visualize this process", "make a diagram for this doc", or mentions 流程图/架构图/示意图/对比图/时序图/泳道图/时间线. Also trigger when user provides a document/article and asks for…

wentong2022-arch/flowforge-skill · 153 tokens

zephyr

Zephyr - A Python REST API client for PTC Windchill PLM. Query parts, documents, change requests, suppliers, BOMs, CAD documents, workflows, and more. Supports OAuth 2.0 and Basic authentication.

srinivasmd/windchill-plm · 51 tokens

diagram-design

Create branded architecture, IT current-state, flowchart, sequence, state machine, ER/data model, timeline, swimlane, quadrant, radar/spider, polar chart (polar/radial lollipop), loop/flywheel, nested, tree, org chart, layer stack, Venn, pyramid/funnel, treemap, bar, line, Gantt and scatter charts, high-level…

cathrynlavery/diagram-design · 188 tokens

dxf

Generate, regenerate, and validate 2D DXF drawings from Python ezdxf sources. Use for DXF files, .dxf.py generators, gendxf() sources, 2D profiles, outlines, templates, gaskets, panels, flat patterns, laser/plasma/waterjet cut layouts, and 2D drawing exports of CAD geometry.

earthtojake/text-to-cad · 77 tokens