agentmods.dev

flutter-mcp

flutter-mcp is a skill for Claude Code from Arenukvern/mcp_flutter. It costs 75 tokens per session (1,249 once invoked), scanned A, original, MIT.

A set of instructions for using the Flutter MCP toolkit to inspect, control, and live-edit a Flutter app through its running debug connection.

In plain words
What is it for?
Use it to drive Flutter interfaces, inspect or capture them, apply hot reloads, and confirm that code changes took effect.
Why use it?
It provides a checked workflow for snapshots, taps, text entry, scrolling, hot reloads, and runtime validation, reducing mistakes when working with a live app.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: mentions subagents.

Part of the flutter-mcp-toolkit plugin — 16 skills, 1 agent shipped together

not rated 389repo +3 changed 15d ago A scan SkillSpector: pass 75 tokens original MIT

Good fit Use it to drive Flutter interfaces, inspect or capture them, apply hot reloads, and confirm that code changes took effect.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/arenukvern/mcp_flutter/flutter-mcp
View source ↗ Arenukvern/mcp_flutter docs.page
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.

Any agent
npx skills add Arenukvern/mcp_flutter --skill flutter-mcp
Clone the repo
git clone --depth 1 https://github.com/Arenukvern/mcp_flutter

Made for: Claude Code.

Or install flutter-mcp-toolkit, the plugin that ships this one along with the rest of its 16 skills, 1 agent.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for flutter-mcp

README.md
[![agentmods](https://agentmods.dev/badge/skills/arenukvern/mcp_flutter/flutter-mcp/github.svg)](https://agentmods.dev/skills/arenukvern/mcp_flutter/flutter-mcp)
Your own site
<a href="https://agentmods.dev/skills/arenukvern/mcp_flutter/flutter-mcp"><img src="https://agentmods.dev/badge/skills/arenukvern/mcp_flutter/flutter-mcp/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for flutter-mcp

Your own site · 80×15
<a href="https://agentmods.dev/skills/arenukvern/mcp_flutter/flutter-mcp"><img src="https://agentmods.dev/badge/skills/arenukvern/mcp_flutter/flutter-mcp.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 75 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,249 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin original 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00075 $0.01249
Opus 5.5 $0.00030 $0.00500
Sonnet 5.5 $0.00015 $0.00250
Haiku 4.5 $0.00007 $0.00125

Measured 15d ago against content hash 23764ab97632, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

flutter-mcp 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 15d ago.

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.

plugin/skills/flutter-mcp/SKILL.md · 91 lines

How it starts

The opening of the file, as written. The whole thing — 91 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Flutter MCP

Golden path for agents driving a live Flutter app via the flutter-mcp-toolkit MCP server entry. Older configs may use the legacy flutter-inspector mcpServers registry id for the same binary (that id is not the Claude subagent flutter-mcp-toolkit-runtime).

When to use

  • User references a running Flutter app (debug mode) and wants to inspect, screenshot, interact with, or hot-reload it.
  • User pastes a VM service URI (ws://127.0.0.1:8181/.../ws) or mentions port 8181.
  • You need runtime proof (before/after screenshots) that a code edit took effect.

Preflight (always first)

Before any VM-dependent call:

  1. Call doctor (or run flutter-mcp-toolkit doctor --json) — parses env, ports, app reachability.
  2. Confirm required toolkit extensions exist on the target:
    • ext.mcp.toolkit.app_errors
    • ext.mcp.toolkit.view_details
    • ext.mcp.toolkit.view_screenshots
    • ext.mcp.toolkit.inspect_widget_at_point

If missing, stop and report the instrumentation gap — do not guess:

  • Add mcp_toolkit to pubspec.yaml.
  • Ensure MCPToolkitBinding.instance..initialize()..initializeFlutterToolkit(); runs before runApp.
  • Hot restart (not reload) — reload is often insufficient for extension registration.

Tool naming (v3.0.0+)

All MCP tools surface under the fmt_ capability prefix (fmt_tap_widget, fmt_hot_reload_and_capture, etc.). The prefix is mandatory in tools/call. Skill-local references below use the bare name for readability — when invoking, prepend fmt_. Dynamic-registry host tools (fmt_list_client_tools_and_resources, fmt_client_tool, fmt_client_resource) use the same prefix for a single consistent surface.

Interaction loop (Playwright-style)

  1. fmt_semantic_snapshot → returns s_0..s_N refs + snapshot_id.
  2. fmt_tap_widget / fmt_enter_text / fmt_scroll / fmt_swipe / fmt_long_press / fmt_drag — act on a ref. Always pass snapshotId — you get a structured stale_snapshot error if the tree moved, instead of a silent wrong tap.
  3. fmt_reveal_search — for off-screen semantic targets, bounded snapshot/search/scroll that returns a fresh ref + snapshotId.
  4. fmt_evaluate_dart_expression — read state directly (e.g. AgentState.instance.counter).
  5. fmt_hot_reload_and_capture — after a code edit, returns reload status + screenshot + fresh snapshot + errors in one response. Prefer this over manual reload + separate capture.

Read the full file on GitHub · 91 lines

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.

  1. 15d ago Changed · +1 lines 23764ab97632
  2. 1mo ago First seen · 90 lines · 75 tokens per session scan A 63e8612aae50

Subscribe to this mod's changes

flutter-mcp is a skill published in the GitHub repository Arenukvern/mcp_flutter (389 stars, last pushed 5d ago), licensed MIT. It adds 75 tokens to every session and 1,249 once invoked, about $0.0003 per session on Opus 5.5. 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 2026-09-03.

Building agentsMobileaidartdynamic-toolsfluttermcpmcp-server
Related

Other skills, from other repositories

at_client_skills-sdk

Use this skill when a developer is building a Dart or Flutter app that depends on atclient or atclientflutter from pub.dev, stores or shares data via the Atsign Protocol, needs onboarding (CRAM new-atsign, atKeys file, keychain, APKAM) or APKAM enrollment, asks how to open, own, stop or switch an AtClient or read its…

atsign-foundation/at_client_sdk · 267 tokens

flutter-pre-caching

Use when preloading fonts, asset/network images, Lottie/Rive animations, local JSON/config, warming initial API data, or optimizing Flutter Web startup.

evanca/flutter-ai-rules · 36 tokens

firebase-messaging

Use when setting up Firebase Cloud Messaging, managing permissions and tokens, handling background/foreground notification taps, or dispatching messages server-side (HTTP v1).

evanca/flutter-ai-rules · 35 tokens

bloc

Use when creating a Cubit or Bloc, modeling state with sealed classes or status enums, wiring BlocBuilder/BlocListener/BlocProvider, writing bloc tests, or choosing between Cubit and Bloc.

evanca/flutter-ai-rules · 42 tokens

firebase-database

Use when syncing real-time data, structuring JSON trees, reading/writing, creating listeners, enabling offline persistence, managing presence, sharding, or writing security rules.

evanca/flutter-ai-rules · 38 tokens

flutter-app-architecture

Use when scaffolding a project, refactoring into layers, creating view models/repositories, configuring dependency injection, or implementing unidirectional data flow (MVVM).

evanca/flutter-ai-rules · 38 tokens