browser4-dev

name	browser4-dev
title	browser4-dev
tier	procedure
description	Develop features inside the Browser4 repository itself: add CLI commands, agent tool domains, REST endpoints, tests, and skills; analyze impact, plan dev tasks, check CDP pitfalls, and verify builds. Use when the user asks to add a new browser4-cli command, new tool domain, REST endpoint, modify Browser4's own Kotlin/Rust code, or check which modules a change affects.
allowed-tools	coding.scaffoldFlow coding.scaffoldFromExample coding.mvnBuild coding.devTask coding.impact coding.moduleGraph coding.trapCheck coding.protect coding.scaffold coding.write coding.read coding.readLines coding.replace coding.replaceRegex coding.editLines coding.insertAfter coding.revert coding.validate coding.shell coding.ktSymbols coding.ktReferences coding.ktInheritance coding.diagnostics coding.references coding.symbols coding.tokenStats coding.estimateTokens

browser4-dev

Quick Start

Add a new browser4-cli command with one call:

coding.scaffoldFlow(type="b4-cli-command", name="my-command", verify=true)

scaffoldFlow generates the whole chain — commands.rs CommandDef, backend MCP alias, tool executor, and test — from a single name; verify=true runs the type-appropriate build check. For other work (agent tool, REST endpoint, test class, skill), use the matching type and see Workflows below.

Develop features inside the Browser4 repository itself, following the repository's own conventions (AGENTS.md) — with multi-file skeletons generated from the repository's real reference implementations, so the output never goes stale.

When to Use

• User wants to add a new browser4-cli command
• User wants to add a new agent tool domain (plugin tool)
• User wants to add a REST endpoint (Controller + Service)
• User wants to add a test class or a skill
• User wants to modify Browser4's own Kotlin/Rust code and verify it compiles
• User wants to know which modules a change affects, or plan a whole dev task

How It Works

scaffoldFlow derives multi-file skeletons from the repository's real reference implementations, so generated code matches current conventions instead of stale templates. moduleGraph/impact rebuild the dependency picture from the live pom.xml files, and mvnBuild verifies with structured diagnostics. Follow AGENTS.md conventions at every step.

Patterns

1. Add a new CLI command

coding.scaffoldFlow(type="b4-cli-command", name="my-command", verify=true)
coding.mvnBuild(module="browser4-rest")

2. Add a REST endpoint

coding.scaffoldFlow(type="rest-endpoint", name="my-resource", verify=true)

3. Modify browser driver code

coding.trapCheck(path="browser4-core/browser4-browser/src/.../PulsarWebDriver.kt")
coding.impact(path=<file>)
coding.mvnBuild(module="browser4-core/browser4-browser")

Flags

coding tools take structured arguments, not CLI flags — see Workflows below for each tool's parameters.

Errors & Recovery

Symptom	Cause	Fix
mvnBuild fails after scaffolding	Generated code conflicts with existing code	Read diagnostics, fix the conflicting file, re-run
scaffoldFlow rejects verify=true	Type-specific build check failed	Run without verify, inspect, then re-run after fixing
Unknown blast radius	Skipped moduleGraph/impact	Run them first — see Workflow 0

Workflows

0. Before changing anything — know the blast radius

coding.moduleGraph(module="browser4-core/browser4-browser")
  → LIVE module graph rebuilt from the real pom.xml files: direct deps,
    transitive dependents, and drift warnings vs the static snapshot

coding.impact(path="browser4-core/browser4-browser/src/.../PulsarWebDriver.kt")
  → owning module + affected modules (transitively) + suggested test commands

coding.trapCheck(path=<browser-driver file>)
  → CDP pitfall advisories (mouseWheel race, cursor positioning, insertText racing)

1. Add a new CLI command

coding.scaffoldFlow(type="b4-cli-command", name="extract-prices",
     description="Extract product prices from a page", category="Extract")
  → 4 files: commands.rs CommandDef, MCPToolController alias, backend skeleton, test

coding.write(path="cli/browser4-cli/src/commands.rs", content=<CommandDef block>)
coding.write(path="browser4-rest/.../MCPToolController.kt", content=<alias snippet>)
... write each piece ...

# Verify both sides:
coding.shell(command="cargo test --bin browser4-cli")          # Rust side
coding.mvnBuild(module="browser4-rest", goals="compile")       # Kotlin side

2. Add a new agent tool domain (plugin)

coding.scaffoldFlow(type="agent-tool", name="browser4-weather", domain="weather",
     basePackage="ai.platon.pulsar.weather", toolMethod="fetchWeather",
     description="Fetch weather for the current page")
  → 2 files: ToolExecutor + ToolMount auto-config

coding.mvnBuild(module="browser4-plugins/browser4-weather", goals="compile")
coding.validate(type="plugin", path="browser4-plugins/browser4-weather")

3. Add a REST endpoint

coding.scaffoldFlow(type="rest-endpoint", name="analysis",
     description="Run an analysis task")
  → 3 files: AnalysisController + AnalysisService + AnalysisControllerTest

4. Add a test class / skill

coding.scaffoldFlow(type="test-class", name="my-tool",
     basePackage="ai.platon.pulsar.agentic.tools")
coding.scaffoldFlow(type="skill", name="browser4-myflow",
     description="A custom Browser4 flow")

5. Clone an existing implementation (anti-staleness)

# Single file:
coding.scaffoldFromExample(path="browser4-plugins/browser4-seo/.../SeoToolExecutor.kt")
  → discovery: shows parameters (basePackage, className, domain, toolMethod)
coding.scaffoldFromExample(path=<same>, basePackage="ai.platon.pulsar.weather",
     className="WeatherToolExecutor", domain="weather", toolMethod="fetchWeather")

# Whole plugin directory (cross-file consistent + stem-derived siblings):
coding.scaffoldFromExample(path="browser4-plugins/browser4-seo",
     className="WeatherToolExecutor", basePackage="ai.platon.pulsar.weather",
     domain="weather", artifactId="browser4-weather")
  → renames the executor AND sibling classes sharing the stem
    (SeoAutoConfiguration→WeatherAutoConfiguration, SeoService→WeatherService, ...)

6. Plan a whole dev task in one call

coding.devTask(task="fix the mouseWheel race in PulsarWebDriver.kt under
     browser4-core/browser4-browser/src/main/kotlin, add a regression test",
     verify=true)
  → AGENTS.md dev-flow plan (read → impact → mvnBuild → tests → trapCheck →
    repo-consistency → commit), with the fast checks already RUN:
    compile of the inferred module, CDP trap check, repo-consistency.
    Add runTests=true to also execute the module's test suite.

Rules

1. Prefer scaffoldFlow over hand-writing — multi-file consistency (same identifier in commands.rs + alias + test) is automatic.
2. Verify both sides for CLI changes: cargo test --bin browser4-cli for Rust, coding.mvnBuild for Kotlin.
3. Kotlin diagnostics: use coding.mvnBuild (fast compiler passthrough) — no JDTLS server is configured.
4. AGENTS.md is the contract — when the repo's conventions change, regenerate skeletons from the updated reference implementations rather than editing stale output.
5. Keep changes small: one command/domain/endpoint per cycle; coding.revert undoes a bad edit.
6. Governance files are protected: delete/replace on VERSION, AGENTS.md, CLAUDE.md, root pom.xml, the BOM, and the CI workflow are blocked by design — ask the user for explicit intent instead of working around it. Add session-level protections for any other file with coding.protect(path, on).
7. Module topology is live: coding.moduleGraph/coding.impact rebuild from the real poms; the static ModuleMap snapshot is guarded by E2E tests against drift — sync it when adding a module. Use coding.ktReferences(scope="module") and coding.ktInheritance before refactoring shared Kotlin symbols.

Examples

User: 给 browser4-cli 加一个 extract-prices 命令
Agent: 1. coding.scaffoldFlow(type="b4-cli-command", name="extract-prices", ...)
       2. 写 commands.rs CommandDef、MCPToolController alias、后端骨架、测试
       3. coding.shell(command="cargo test --bin browser4-cli")
       4. coding.mvnBuild(module="browser4-rest", goals="compile")
       5. 报告：6 处触点全部就位，双端编译通过

User: 克隆 browser4-seo 插件成天气插件
Agent: 1. coding.scaffoldFromExample(path="browser4-plugins/browser4-seo",
          className="WeatherToolExecutor", basePackage="ai.platon.pulsar.weather",
          domain="weather", artifactId="browser4-weather")
       2. 逐文件 coding.write
       3. coding.mvnBuild(module="browser4-plugins/browser4-weather")
       4. coding.validate(type="plugin", path="browser4-plugins/browser4-weather")