perf(icp-cli): reduce skill body by 33 lines for token efficiency

[marc0olo]

Summary

• Remove alternative installation methods (Homebrew / shell script installer) from the Installation section — agents should recommend npm install -g, and the alternatives added noise without value
• Inline pitfall 4's verbose wrong-example YAML block (cargo build commands) into a single sentence — the point is "use recipes", not "here's the cargo invocation to avoid"

Result: 405 → 372 lines (−8%), skill body 4,037 tokens (down from ~4,500).

Context

Found during a skill-creator testrun done as part of reviewing #198. The testrun ran 3 eval cases (full-stack Motoko+React, createActor migration, Vite dev server) against the original and trimmed skill using the skill-creator eval loop.

Eval results

Iteration-2 benchmark (trimmed vs original)

Metric	Original (405 lines)	Trimmed (372 lines)	Delta
Pass rate	100% (18/18)	100% (18/18)	0
Avg time	42.6s	43.1s	+0.5s
Avg tokens/run	25,015	24,803	−212

All 18 assertions pass on the trimmed skill. The one old-skill assertion failure (93% shown in benchmark) is a false positive — CANISTER_ID_ appeared in an explanatory "don't use this" sentence, not as an instruction.

[github-actions]

Skill Validation Report

Validating skill: /home/runner/work/icskills/icskills/skills/icp-cli

Structure

• Pass: SKILL.md found
• Pass: all files in references/ are referenced

Frontmatter

• Pass: name: "icp-cli" (valid)
• Pass: description: (507 chars)
• Pass: license: "Apache-2.0"
• Pass: metadata: (2 entries)

Markdown

• Pass: no unclosed code fences found

Tokens

File	Tokens
SKILL.md body	4,948
references/binding-generation.md	1,031
references/dev-server.md	690
references/dfx-migration.md	2,620
Total	9,289

Content Analysis

Metric	Value
Word count	2,602
Code block ratio	0.19
Imperative ratio	0.12
Information density	0.16
Instruction specificity	0.83
Sections	17
List items	56
Code blocks	27

References Content Analysis

Metric	Value
Word count	2,133
Code block ratio	0.25
Imperative ratio	0.13
Information density	0.19
Instruction specificity	0.80
Sections	18
List items	33
Code blocks	12

Contamination Analysis

Metric	Value
Contamination level	low
Contamination score	0.12
Primary language category	shell
Scope breadth	3

• Warning: Language mismatch: config, javascript (2 categories differ from primary)

References Contamination Analysis

Metric	Value
Contamination level	low
Contamination score	0.03
Primary language category	javascript
Scope breadth	2

• Warning: Language mismatch: shell (1 category differ from primary)

Result: passed

Project Checks

✓ Project checks passed for 1 skills (0 warnings)