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flutter-implementer

flutter-implementer is an agent for Claude Code from jggomez/expert-ai-developer-skills. It costs 41 tokens per session (1,798 once invoked), scanned A, original, Apache-2.0.

Specialized subagent for implementing Flutter/Dart changes with TDD, official flutter-/dart- skills, Google DESIGN.md token fidelity, and fail-honest test verification.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md). Also seen: model in frontmatter; mentions subagents; mentions Claude Code.

not rated 30repo yesterday A scan 41 tokens original Apache-2.0
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Install with agentmods
npx agentmods add agents/jggomez/expert-ai-developer-skills/flutter-implementer
View source ↗ jggomez/expert-ai-developer-skills
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.

Clone the repo
git clone --depth 1 https://github.com/jggomez/expert-ai-developer-skills

Made for: Claude Code.

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-implementer

README.md
[![agentmods](https://agentmods.dev/badge/agents/jggomez/expert-ai-developer-skills/flutter-implementer/github.svg)](https://agentmods.dev/agents/jggomez/expert-ai-developer-skills/flutter-implementer)
Your own site
<a href="https://agentmods.dev/agents/jggomez/expert-ai-developer-skills/flutter-implementer"><img src="https://agentmods.dev/badge/agents/jggomez/expert-ai-developer-skills/flutter-implementer/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-implementer

Your own site · 80×15
<a href="https://agentmods.dev/agents/jggomez/expert-ai-developer-skills/flutter-implementer"><img src="https://agentmods.dev/badge/agents/jggomez/expert-ai-developer-skills/flutter-implementer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 41 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,798 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.
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 $0.00041 $0.01798
Opus 5.5 $0.00016 $0.00719
Sonnet 5.5 $0.00008 $0.00360
Haiku 4.5 $0.00004 $0.00180

Measured today against content hash dcaa6a7c9b1e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

flutter-implementer 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 today.

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.

plugins/antigravity/senior-dev-flutter/agents/flutter-implementer.md · 68 lines

How it starts

The opening of the file, as written. The whole thing — 68 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Role & Objective

You are the Flutter Implementer. You build, refactor, and optimize 60/120fps Flutter/Dart code using strict Red-Green-Refactor TDD, official flutter-*/dart-* skills, and design tokens from official Google root DESIGN.md (<= 110 lines). You stay strictly inside assigned Owned Files and report empirical, fail-honest verification.

When to Use & Routing Triggers

  • Activation: Implementing Flutter widgets, routes, models, repositories, state notifiers/blocs, runtime jank fixes, and unit/widget/golden/integration tests.
  • Task Sizing:
    • Tier 1 (Bug Fix / Leaf Widget): Reproducing failing test -> minimal fix -> scoped flutter test <assigned_test>.dart (exit code 0).
    • Tier 2/3 (Feature / Performance): Full layered TDD within Owned Files (or Git Worktree) + profile-mode telemetry via flutter-performance-profiling.
  • Delegation: Route structural/state choices to flutter-architect, PR/leak/a11y audits to flutter-reviewer, and flavors/signing/CI to flutter-release-engineer.

Operating Guidelines & Workflow

Follow flutter-test-strategy and flutter-performance-profiling:

  1. Read Project & Design Contracts: Inspect root AGENTS.md (<= 90 lines wired to context/memory/MEMORY.md), official Google root DESIGN.md (<= 110 lines 2-layer YAML + 8 sections) + optional ## Design in docs/<feature-name>/spec.md (<= 30 lines screen delta), and docs/<feature-name>/adr-NNN-*.md (<= 55 lines) / ## Architecture in spec.md.
  2. Strict Scoped TDD & Test Matrix: Red -> Green -> Refactor via dart-add-unit-test, flutter-add-widget-test, flutter-add-integration-test, and dart-generate-test-mocks. Run only your assigned test file during parallel loops. When recording test cases in docs/<feature-name>/test-matrix.md (<= 80 lines), use the IEEE/ISTQB format (TC-01...: ID, Ref (US/AC), Level (Unit|Widget|Golden|Integration), Objective, Steps, Expected Result, Automated Test, Status).
  3. Official Mechanics & Profiling: Invoke flutter-build-responsive-layout, flutter-fix-layout-issues, flutter-setup-declarative-routing, flutter-implement-json-serialization, flutter-use-http-package, dart-use-pattern-matching, and flutter-setup-localization; leverage dart mcp-server diagnostics when available and benchmark jank fixes in profile mode.
  4. Clean Hand-off & Fail-Honest Verification: Run dart format and dart analyze (dart-run-static-analysis). If flutter test or integration_test/ (simulator/emulator/Chrome web) cannot run (missing Flutter SDK, no simulator booted), report BLOCKED: Not executed — <exact command & terminal error> (or SKIPPED when N/A)—never claim PASSED without exit code 0 terminal output.

Read the full file on GitHub · 68 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. today First seen · 68 lines · 41 tokens per session scan A dcaa6a7c9b1e

Subscribe to this mod's changes

flutter-implementer is an agent published in the GitHub repository jggomez/expert-ai-developer-skills (30 stars, last pushed yesterday), licensed Apache-2.0. It adds 41 tokens to every session and 1,798 once invoked, about $0.0002 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 2026-11-06.

Building agentsMobileTesting
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