flutter-mcp-toolkit-maintain-web

Agent Building

Maintains flutter_test_app and intentcall web targets (Chrome, web codegen, WebMCP bootstrap, web-showcase, webmcp verify). Use when editing web/index.html, agent_manifest.json, intentcall_webmcp.generated.js, web platform sync, Chrome dogfood, or WebMCP modelContext.

QUICK START

How to use this skill

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Prompt to paste

I want to install this Agent Skill for this project in Codex.

Source SKILL.md: https://github.com/Arenukvern/mcp_flutter/blob/HEAD/plugin/skills/flutter-mcp-toolkit-maintain-web/SKILL.md

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Maintain Web (Chrome + WebMCP)

Dogfood app: flutter_test_app. Canonical platform doc: flutter_test_app/INTENTCALL_PLATFORM.md.

WebMCP vs VM MCP

Path	Proves
VM extensions + `fmt_*` tools	MCP toolkit dogfood (always)
`document.modelContext`	True WebMCP (Chrome flag / `--web-browser-flag`)

ADR: decisions/0008_web_agent_invoke_js_only.mdx — JS fetch('/agent/invoke') 404 by design; Dart invokeDirect works when modelContext exists.

Launch (repeatable WebMCP)

make web-showcase
# WS_URI from .showcase/web_app.log (re-grep after hot reload)
grep -Eo 'ws://127\.0\.0\.1:[0-9]+/[A-Za-z0-9_=-]+/ws' .showcase/web_app.log | tail -1

dart run mcp_server_dart/bin/flutter_mcp_toolkit.dart webmcp chrome-args
dart run mcp_server_dart/bin/flutter_mcp_toolkit.dart webmcp verify --web-port 8080

Stop: make showcase-stop.

Do not rely on chrome://flags alone across machines — use webmcp chrome-args / make web-showcase.

Codegen & hooks

dart run mcp_server_dart/bin/flutter_mcp_toolkit.dart codegen sync \
  --platform web,android,ios,macos,linux,windows \
  --project-dir flutter_test_app

dart run mcp_server_dart/bin/flutter_mcp_toolkit.dart init intentcall-platform \
  --project-dir flutter_test_app --check

Artifact	Source
`web/intentcall_webmcp.generated.js`	`codegen sync` from `web/agent_manifest.json`
`web/index.html`	`init intentcall-platform` script tag
Dart bootstrap	`registerAgentWebMcpFromEntries` in `mcp_toolkit_extensions.dart` (debug web, after `addEntries`; `intentcall_platform`)

Runtime validate

dart run mcp_server_dart/bin/flutter_mcp_toolkit.dart --save-images \
  --output-dir .showcase/web_iter validate-runtime \
  --target "$WS_URI" \
  --flutter-device chrome \
  --timeout-ms 45000

Pass --web-browser-debugging-port <cdp> if CDP discovery fails.

Known issues

Duplicate tool name — generated JS + registerAgentWebMcpFromEntries both call registerTool; dedupe or gate one path (agent_web_mcp_bootstrap_web.dart name cache).
CDP probe — webmcp verify may report webmcp_active_log_evidence while CDP hasModelContext is false (Flutter execution context).
Stale WS_URI — always grep fresh token after hot restart before eval/validate.

docs/superpowers/evals/2026-05-26-webmcp-verification.md
flutter-mcp-cli-runtime-validation — validate-runtime details
flutter-mcp-toolkit-dogfood-iterations — scored iterations