json-canvas

Create and edit JSON Canvas files (.canvas) with nodes, edges, groups, and connections. Use when working with .canvas files, creating visual canvases, mind maps, flowcharts, or when the user mentions Canvas files in Obsidian.

1.12x

Quality

75%

Does it follow best practices?

Impact

96%

1.12x

Average score across 3 eval scenarios

Securityby

Passed

No findings from the security scan

Fix and improve this skill with Tessl

tessl review fix ./plugins/all-skills/skills/json-canvas/SKILL.md

Quality

Content

63%Weight 40%Scale 1-5

Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.

The body is well-structured and highly actionable with complete JSON examples and a validation checklist, but it is verbose for a single-purpose format skill and monolithic, inlining reference material that could be split into bundle files.

Suggestions

Move the four full canvas examples and/or the full attribute spec tables into reference files under references/ and link to them from SKILL.md to improve progressive disclosure and reduce token load.

Trim redundant explanatory prose (e.g. restating that coordinates can be negative or repeating node-type intros) to tighten conciseness.

Consider consolidating the per-node example JSON into one annotated template to cut length while preserving actionability.

Dimension	Reasoning	Score
Conciseness	Format tables are efficient, but ~400 lines of inlined spec plus four full canvas examples repeat content Claude could largely derive from the spec reference, leaving some padding.	3 / 5
Actionability	Provides complete, valid JSON examples per node type and full composite canvases that are copy-paste-ready; minor gaps (e.g. no edge-between-groups example) keep it below 5.	4 / 5
Workflow Clarity	Single-purpose skill with clear section sequencing and an explicit Validation Rules checklist; no destructive/batch operations requiring feedback loops, so the missing-validation cap does not apply.	4 / 5
Progressive Disclosure	Single monolithic file inlines the full spec, attribute tables, and four examples with no references/ scripts/ assets/ bundle to split into; structure exists but content that could live in separate reference files is all inline.	3 / 5
	Total	14 / 20 Passed

Description

87%Weight 40%Scale 1-5

Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.

The description is strong: it names concrete actions, provides natural trigger terms including the .canvas extension, explicitly covers what and when, and occupies a clear niche. Minor synonym gaps in trigger terms are the only weakness.

Dimension	Reasoning	Score
Specificity	Quotes concrete actions ('Create and edit JSON Canvas files ... with nodes, edges, groups, and connections') listing several specific operations; minor gaps keep it just below a comprehensive 5.	4 / 5
Completeness	Explicitly answers both what ('Create and edit JSON Canvas files ...') and when ('Use when working with .canvas files ... when the user mentions Canvas files in Obsidian') with concrete trigger phrases.	5 / 5
Trigger Term Quality	Natural triggers present ('.canvas files', 'mind maps', 'flowcharts', 'Canvas files in Obsidian'); missing a few synonyms (e.g. 'diagrams', 'node-based') so not a full 5.	4 / 5
Distinctiveness Conflict Risk	Clear niche around the JSON Canvas/.canvas format in Obsidian with distinct triggers; minimal overlap risk with other skills.	5 / 5
	Total	18 / 20 Passed

Validation

87%

Warnings & errors only

Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.

Validation — 14 / 16 Passed

Validation for skill structure

Criteria	Description	Result
skill_md_line_count	SKILL.md is long (570 lines); consider splitting into references/ and linking	Warning
frontmatter_unknown_keys	Unknown frontmatter key(s) found; consider removing or moving to metadata	Warning

	Total	14 / 16 Passed

Repository: davepoon/buildwithclaude
Path: plugins/all-skills/skills/json-canvas/SKILL.md
Commit: a9fa86d

Reviewed: about 20 hours ago

Table of Contents

Discovery Implementation Validation

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