feat: add WebMCP skill — AI agent tool protocol for IC canisters

[dfinityianblenke]

Summary

Adds a new WebMCP skill that teaches AI agents how to expose IC canister methods as callable tools via the Web Model Context Protocol (W3C, Chrome 146+).

This complements dfinity/ic#9708 which implements the WebMCP stack in the IC repo.

Skill covers:

• dfx.json webmcp config section (all fields documented)
• ic-webmcp-codegen CLI (both did and dfx subcommands)
• CORS headers via .ic-assets.json5
• Browser integration (navigator.modelContext + @dfinity/webmcp)
• Non-Chrome polyfill with OpenAI/Anthropic/LangChain adapters
• Internet Identity scoped delegation for agent auth
• Candid → JSON Schema type mapping table
• 10 common pitfalls (e.g., empty delegation targets, CDN supply chain, recursive types)

Evaluation:

• 4 output evals: add WebMCP to canister, auth tools, polyfill usage, manifest generation
• 8 should-trigger / 6 should-not-trigger queries

Files:

• skills/webmcp/SKILL.md (291 lines, under 500 limit)
• evaluations/webmcp.json

This is related to the ic repo PR !9708: dfinity/ic#9708

[github-actions]

Skill Validation Report

Validating skill: /home/runner/work/icskills/icskills/skills/webmcp

Structure

• Pass: SKILL.md found

Frontmatter

• Pass: name: "webmcp" (valid)
• Pass: description: (402 chars)
• Pass: license: "Apache-2.0"
• Pass: compatibility: (16 chars)
• Pass: metadata: (2 entries)

Markdown

• Pass: no unclosed code fences found

Tokens

File	Tokens
SKILL.md body	3,118
Total	3,118

Content Analysis

Metric	Value
Word count	1,520
Code block ratio	0.33
Imperative ratio	0.12
Information density	0.23
Instruction specificity	1.00
Sections	13
List items	25
Code blocks	10

Contamination Analysis

Metric	Value
Contamination level	medium
Contamination score	0.46
Primary language category	javascript
Scope breadth	5

• Warning: Language mismatch: config, markup, shell, systems (4 categories differ from primary)

Result: passed

Project Checks

✓ Project checks passed for 1 skills (0 warnings)