Kode-cli/docs/develop/modules/context-system.md

Context System

Overview

The Context System (src/context.ts) manages all contextual information about the project and environment that gets injected into AI conversations. It provides automatic context gathering, caching, and intelligent injection to improve AI response quality.

Architecture

Core Context Manager

interface ContextManager {
  // Context gathering
  getContext(): Promise<CompleteContext>
  getGitContext(): Promise<GitContext>
  getProjectContext(): Promise<ProjectContext>
  getSystemContext(): SystemContext
  
  // Context files
  loadContextFile(): Promise<string | null>
  loadClaudeFile(): Promise<string | null>
  
  // Context manipulation
  setContext(key: string, value: any): void
  removeContext(key: string): void
  clearContext(): void
  
  // Caching
  invalidateCache(): void
  getCacheStatus(): CacheStatus
}

Context Types

Complete Context Structure

interface CompleteContext {
  // Project information
  projectName?: string
  projectDescription?: string
  projectType?: string
  
  // Git information
  gitStatus?: string
  recentCommits?: string
  currentBranch?: string
  remoteUrl?: string
  
  // Directory structure
  directoryStructure?: string
  importantFiles?: string[]
  
  // Code style and patterns
  codeStyle?: CodeStyle
  dependencies?: Dependencies
  
  // Documentation
  contextFile?: string      // AGENTS.md content
  claudeFile?: string       // CLAUDE.md content
  readmeContent?: string    // README.md content
  
  // System information
  platform?: string
  cwd?: string
  timestamp?: string
  
  // Custom context
  customContext?: Record<string, any>
}

Git Context

interface GitContext {
  isGitRepo: boolean
  branch?: string
  status?: string
  recentCommits?: Commit[]
  modifiedFiles?: string[]
  untrackedFiles?: string[]
  stagedFiles?: string[]
  remotes?: Remote[]
  lastCommitInfo?: {
    hash: string
    author: string
    date: string
    message: string
  }
}

async function getGitContext(): Promise<GitContext> {
  const isGitRepo = await checkIsGitRepo()
  
  if (!isGitRepo) {
    return { isGitRepo: false }
  }
  
  const [status, branch, commits, remotes] = await Promise.all([
    getGitStatus(),
    getCurrentBranch(),
    getRecentCommits(10),
    getRemotes()
  ])
  
  return {
    isGitRepo: true,
    branch,
    status,
    recentCommits: commits,
    modifiedFiles: parseModifiedFiles(status),
    untrackedFiles: parseUntrackedFiles(status),
    stagedFiles: parseStagedFiles(status),
    remotes,
    lastCommitInfo: commits[0]
  }
}

Project Context

interface ProjectContext {
  type: ProjectType
  framework?: string
  language?: string
  packageManager?: PackageManager
  testFramework?: string
  buildTool?: string
  dependencies?: Record<string, string>
  devDependencies?: Record<string, string>
  scripts?: Record<string, string>
  configuration?: ProjectConfig
}

class ProjectAnalyzer {
  async analyze(): Promise<ProjectContext> {
    const files = await this.discoverProjectFiles()
    const type = this.detectProjectType(files)
    
    switch (type) {
      case 'node':
        return this.analyzeNodeProject()
      case 'python':
        return this.analyzePythonProject()
      case 'rust':
        return this.analyzeRustProject()
      case 'go':
        return this.analyzeGoProject()
      default:
        return this.analyzeGenericProject()
    }
  }
  
  private async analyzeNodeProject(): Promise<ProjectContext> {
    const packageJson = await this.readPackageJson()
    
    return {
      type: 'node',
      framework: this.detectFramework(packageJson),
      language: this.detectLanguage(packageJson),
      packageManager: this.detectPackageManager(),
      testFramework: this.detectTestFramework(packageJson),
      buildTool: this.detectBuildTool(packageJson),
      dependencies: packageJson.dependencies,
      devDependencies: packageJson.devDependencies,
      scripts: packageJson.scripts,
      configuration: await this.loadNodeConfig()
    }
  }
  
  private detectFramework(pkg: PackageJson): string | undefined {
    const deps = { ...pkg.dependencies, ...pkg.devDependencies }
    
    if (deps['react']) return 'react'
    if (deps['vue']) return 'vue'
    if (deps['@angular/core']) return 'angular'
    if (deps['svelte']) return 'svelte'
    if (deps['next']) return 'nextjs'
    if (deps['nuxt']) return 'nuxt'
    if (deps['express']) return 'express'
    if (deps['fastify']) return 'fastify'
    if (deps['koa']) return 'koa'
    if (deps['nest']) return 'nestjs'
    
    return undefined
  }
}

Context Files

AGENTS.md

class ContextFileLoader {
  private readonly CONTEXT_PATHS = [
    'AGENTS.md',
    '.claude/AGENTS.md',
    'docs/AGENTS.md',
    '.github/AGENTS.md'
  ]
  
  async loadContextFile(): Promise<string | null> {
    for (const path of this.CONTEXT_PATHS) {
      const fullPath = join(getCwd(), path)
      
      if (existsSync(fullPath)) {
        try {
          const content = await fs.readFile(fullPath, 'utf-8')
          return this.processContextFile(content)
        } catch (error) {
          console.warn(`Failed to read ${path}:`, error)
        }
      }
    }
    
    return null
  }
  
  private processContextFile(content: string): string {
    // Process includes
    content = this.processIncludes(content)
    
    // Process variables
    content = this.processVariables(content)
    
    // Process conditionals
    content = this.processConditionals(content)
    
    return content
  }
  
  private processIncludes(content: string): string {
    const INCLUDE_REGEX = /<!-- include: (.+) -->/g
    
    return content.replace(INCLUDE_REGEX, (match, filePath) => {
      try {
        const fullPath = join(getCwd(), filePath.trim())
        if (existsSync(fullPath)) {
          return readFileSync(fullPath, 'utf-8')
        }
      } catch (error) {
        console.warn(`Failed to include ${filePath}:`, error)
      }
      return match
    })
  }
  
  private processVariables(content: string): string {
    const variables = {
      PROJECT_NAME: this.getProjectName(),
      CWD: getCwd(),
      DATE: new Date().toISOString(),
      GIT_BRANCH: this.getCurrentBranch(),
      NODE_VERSION: process.version
    }
    
    return content.replace(/\{\{(\w+)\}\}/g, (match, key) => {
      return variables[key] || match
    })
  }
}

CLAUDE.md

class ClaudeFileLoader {
  private readonly CLAUDE_PATHS = [
    'CLAUDE.md',
    '.claude/CLAUDE.md'
  ]
  
  private readonly GLOBAL_CLAUDE_PATH = join(homedir(), '.claude', 'CLAUDE.md')
  
  async loadClaudeFile(): Promise<ClaudeFileContent> {
    const [projectFile, globalFile] = await Promise.all([
      this.loadProjectClaudeFile(),
      this.loadGlobalClaudeFile()
    ])
    
    return {
      project: projectFile,
      global: globalFile,
      merged: this.mergeClaudeFiles(projectFile, globalFile)
    }
  }
  
  private async loadProjectClaudeFile(): Promise<string | null> {
    for (const path of this.CLAUDE_PATHS) {
      const fullPath = join(getCwd(), path)
      
      if (existsSync(fullPath)) {
        return fs.readFile(fullPath, 'utf-8')
      }
    }
    
    return null
  }
  
  private async loadGlobalClaudeFile(): Promise<string | null> {
    if (existsSync(this.GLOBAL_CLAUDE_PATH)) {
      return fs.readFile(this.GLOBAL_CLAUDE_PATH, 'utf-8')
    }
    
    return null
  }
  
  private mergeClaudeFiles(
    project: string | null,
    global: string | null
  ): string {
    const parts: string[] = []
    
    if (global) {
      parts.push('# Global Instructions\n\n' + global)
    }
    
    if (project) {
      parts.push('# Project Instructions\n\n' + project)
    }
    
    return parts.join('\n\n---\n\n')
  }
}

Directory Structure Analysis

Directory Scanner

class DirectoryStructureAnalyzer {
  private readonly IGNORE_PATTERNS = [
    'node_modules',
    '.git',
    'dist',
    'build',
    'coverage',
    '.next',
    '__pycache__',
    '.pytest_cache',
    'venv',
    '.venv',
    'target',
    '.idea',
    '.vscode'
  ]
  
  private readonly MAX_DEPTH = 4
  private readonly MAX_FILES = 1000
  
  async analyze(rootPath: string = getCwd()): Promise<DirectoryStructure> {
    const structure = await this.scanDirectory(rootPath, 0)
    const summary = this.generateSummary(structure)
    const tree = this.generateTree(structure)
    
    return {
      structure,
      summary,
      tree,
      importantFiles: this.identifyImportantFiles(structure)
    }
  }
  
  private async scanDirectory(
    path: string,
    depth: number
  ): Promise<DirectoryNode> {
    if (depth >= this.MAX_DEPTH) {
      return { path, type: 'directory', truncated: true }
    }
    
    const entries = await fs.readdir(path, { withFileTypes: true })
    const children: DirectoryNode[] = []
    let fileCount = 0
    
    for (const entry of entries) {
      if (this.shouldIgnore(entry.name)) continue
      if (fileCount >= this.MAX_FILES) break
      
      const fullPath = join(path, entry.name)
      
      if (entry.isDirectory()) {
        const child = await this.scanDirectory(fullPath, depth + 1)
        children.push(child)
      } else {
        children.push({
          path: fullPath,
          name: entry.name,
          type: 'file',
          size: await this.getFileSize(fullPath),
          extension: extname(entry.name)
        })
        fileCount++
      }
    }
    
    return {
      path,
      type: 'directory',
      children,
      fileCount,
      totalSize: await this.calculateTotalSize(children)
    }
  }
  
  private generateTree(node: DirectoryNode, prefix = ''): string {
    const lines: string[] = []
    
    if (node.type === 'file') {
      lines.push(prefix + node.name)
    } else if (node.children) {
      for (let i = 0; i < node.children.length; i++) {
        const child = node.children[i]
        const isLast = i === node.children.length - 1
        const connector = isLast ? '└── ' : '├── '
        const extension = isLast ? '    ' : '│   '
        
        lines.push(prefix + connector + basename(child.path))
        
        if (child.type === 'directory' && child.children) {
          const subtree = this.generateTree(child, prefix + extension)
          lines.push(subtree)
        }
      }
    }
    
    return lines.join('\n')
  }
  
  private identifyImportantFiles(structure: DirectoryNode): string[] {
    const important: string[] = []
    const importantPatterns = [
      /^package\.json$/,
      /^tsconfig\.json$/,
      /^README\.md$/i,
      /^CONTEXT\.md$/,
      /^CLAUDE\.md$/,
      /^\.env(\.example)?$/,
      /^docker-compose\.yml$/,
      /^Dockerfile$/,
      /^requirements\.txt$/,
      /^pyproject\.toml$/,
      /^Cargo\.toml$/,
      /^go\.mod$/,
      /^pom\.xml$/,
      /^build\.gradle$/
    ]
    
    function traverse(node: DirectoryNode) {
      if (node.type === 'file') {
        const name = basename(node.path)
        if (importantPatterns.some(pattern => pattern.test(name))) {
          important.push(node.path)
        }
      } else if (node.children) {
        node.children.forEach(traverse)
      }
    }
    
    traverse(structure)
    return important
  }
}

Code Style Detection

Style Analyzer

class CodeStyleAnalyzer {
  async analyze(): Promise<CodeStyle> {
    const files = await this.findSourceFiles()
    const samples = await this.takeSamples(files, 10)
    
    return {
      indentation: this.detectIndentation(samples),
      quotes: this.detectQuotes(samples),
      semicolons: this.detectSemicolons(samples),
      lineEndings: this.detectLineEndings(samples),
      trailingCommas: this.detectTrailingCommas(samples),
      bracketSpacing: this.detectBracketSpacing(samples),
      naming: this.detectNamingConventions(samples),
      maxLineLength: this.detectMaxLineLength(samples),
      fileNaming: this.detectFileNaming(files)
    }
  }
  
  private detectIndentation(samples: string[]): IndentationStyle {
    let spaces = 0
    let tabs = 0
    let twoSpaces = 0
    let fourSpaces = 0
    
    for (const sample of samples) {
      const lines = sample.split('\n')
      
      for (const line of lines) {
        if (line.startsWith('\t')) {
          tabs++
        } else if (line.startsWith('    ')) {
          fourSpaces++
          spaces++
        } else if (line.startsWith('  ')) {
          twoSpaces++
          spaces++
        }
      }
    }
    
    if (tabs > spaces) {
      return { type: 'tabs', size: 1 }
    } else if (fourSpaces > twoSpaces) {
      return { type: 'spaces', size: 4 }
    } else {
      return { type: 'spaces', size: 2 }
    }
  }
  
  private detectNamingConventions(samples: string[]): NamingConventions {
    const patterns = {
      camelCase: /[a-z][a-zA-Z0-9]*/g,
      PascalCase: /[A-Z][a-zA-Z0-9]*/g,
      snake_case: /[a-z]+(_[a-z]+)+/g,
      kebab_case: /[a-z]+(-[a-z]+)+/g,
      SCREAMING_SNAKE: /[A-Z]+(_[A-Z]+)+/g
    }
    
    const counts: Record<string, number> = {}
    
    for (const sample of samples) {
      for (const [name, pattern] of Object.entries(patterns)) {
        const matches = sample.match(pattern) || []
        counts[name] = (counts[name] || 0) + matches.length
      }
    }
    
    return {
      variables: this.getMostCommon(counts, ['camelCase', 'snake_case']),
      functions: this.getMostCommon(counts, ['camelCase', 'snake_case']),
      classes: this.getMostCommon(counts, ['PascalCase', 'camelCase']),
      constants: this.getMostCommon(counts, ['SCREAMING_SNAKE', 'camelCase']),
      files: this.getMostCommon(counts, ['kebab_case', 'snake_case', 'camelCase'])
    }
  }
}

Context Injection

Message Context Builder

class MessageContextBuilder {
  buildSystemContext(context: CompleteContext): string {
    const sections: string[] = []
    
    // Add CLAUDE.md instructions first (highest priority)
    if (context.claudeFile) {
      sections.push(context.claudeFile)
    }
    
    // Add project context
    if (context.contextFile) {
      sections.push('# Project Context\n\n' + context.contextFile)
    }
    
    // Add git status
    if (context.gitStatus) {
      sections.push('# Git Status\n\n```\n' + context.gitStatus + '\n```')
    }
    
    // Add directory structure
    if (context.directoryStructure) {
      sections.push('# Directory Structure\n\n```\n' + context.directoryStructure + '\n```')
    }
    
    // Add important files list
    if (context.importantFiles?.length) {
      sections.push('# Important Files\n\n' + context.importantFiles.map(f => `- ${f}`).join('\n'))
    }
    
    // Add code style
    if (context.codeStyle) {
      sections.push('# Code Style\n\n' + this.formatCodeStyle(context.codeStyle))
    }
    
    // Add custom context
    if (context.customContext) {
      sections.push('# Additional Context\n\n' + JSON.stringify(context.customContext, null, 2))
    }
    
    return sections.join('\n\n---\n\n')
  }
  
  private formatCodeStyle(style: CodeStyle): string {
    return `
- Indentation: ${style.indentation.type} (${style.indentation.size})
- Quotes: ${style.quotes}
- Semicolons: ${style.semicolons}
- Line endings: ${style.lineEndings}
- Trailing commas: ${style.trailingCommas}
- Bracket spacing: ${style.bracketSpacing}
- Max line length: ${style.maxLineLength}
`
  }
}

Smart Context Injection

class SmartContextInjector {
  inject(
    messages: Message[],
    context: CompleteContext,
    options: InjectionOptions = {}
  ): Message[] {
    const injector = new ContextInjector(context, options)
    
    // Determine what context to include based on conversation
    const relevantContext = injector.analyzeRelevance(messages)
    
    // Build system message with relevant context
    const systemMessage = injector.buildSystemMessage(relevantContext)
    
    // Inject at appropriate position
    return injector.injectAtPosition(messages, systemMessage, options.position || 'start')
  }
  
  private analyzeRelevance(messages: Message[]): RelevantContext {
    const keywords = this.extractKeywords(messages)
    const topics = this.identifyTopics(keywords)
    
    return {
      includeGit: topics.includes('version-control') || keywords.has('commit'),
      includeStructure: topics.includes('architecture') || keywords.has('structure'),
      includeStyle: topics.includes('formatting') || keywords.has('style'),
      includeDependencies: topics.includes('packages') || keywords.has('install'),
      includeTests: topics.includes('testing') || keywords.has('test'),
      includeConfig: topics.includes('configuration') || keywords.has('config')
    }
  }
  
  private extractKeywords(messages: Message[]): Set<string> {
    const keywords = new Set<string>()
    const commonWords = new Set(['the', 'a', 'an', 'is', 'are', 'was', 'were'])
    
    for (const message of messages) {
      const words = message.content
        .toLowerCase()
        .split(/\W+/)
        .filter(word => word.length > 2 && !commonWords.has(word))
      
      words.forEach(word => keywords.add(word))
    }
    
    return keywords
  }
}

Caching

Context Cache

class ContextCache {
  private cache: Map<string, CachedContext> = new Map()
  private readonly TTL = 60000 // 1 minute
  
  get(key: string): CompleteContext | null {
    const cached = this.cache.get(key)
    
    if (!cached) return null
    
    if (Date.now() - cached.timestamp > this.TTL) {
      this.cache.delete(key)
      return null
    }
    
    return cached.context
  }
  
  set(key: string, context: CompleteContext): void {
    this.cache.set(key, {
      context,
      timestamp: Date.now()
    })
    
    // Limit cache size
    if (this.cache.size > 10) {
      const oldest = Array.from(this.cache.entries())
        .sort((a, b) => a[1].timestamp - b[1].timestamp)[0]
      
      this.cache.delete(oldest[0])
    }
  }
  
  invalidate(pattern?: string): void {
    if (!pattern) {
      this.cache.clear()
      return
    }
    
    for (const key of this.cache.keys()) {
      if (key.includes(pattern)) {
        this.cache.delete(key)
      }
    }
  }
  
  getCacheKey(options: ContextOptions): string {
    return JSON.stringify({
      cwd: getCwd(),
      includeGit: options.includeGit,
      includeStructure: options.includeStructure,
      includeStyle: options.includeStyle
    })
  }
}

Lazy Loading

class LazyContextLoader {
  private loaders: Map<string, () => Promise<any>> = new Map()
  private results: Map<string, any> = new Map()
  
  constructor() {
    this.registerLoaders()
  }
  
  private registerLoaders(): void {
    this.loaders.set('git', () => getGitContext())
    this.loaders.set('project', () => new ProjectAnalyzer().analyze())
    this.loaders.set('structure', () => new DirectoryStructureAnalyzer().analyze())
    this.loaders.set('style', () => new CodeStyleAnalyzer().analyze())
    this.loaders.set('contextFile', () => new ContextFileLoader().loadContextFile())
    this.loaders.set('claudeFile', () => new ClaudeFileLoader().loadClaudeFile())
  }
  
  async load(keys: string[]): Promise<Record<string, any>> {
    const promises = keys.map(async key => {
      if (this.results.has(key)) {
        return { key, value: this.results.get(key) }
      }
      
      const loader = this.loaders.get(key)
      if (!loader) {
        console.warn(`No loader for context key: ${key}`)
        return { key, value: null }
      }
      
      try {
        const value = await loader()
        this.results.set(key, value)
        return { key, value }
      } catch (error) {
        console.error(`Failed to load context ${key}:`, error)
        return { key, value: null }
      }
    })
    
    const results = await Promise.all(promises)
    
    return results.reduce((acc, { key, value }) => {
      acc[key] = value
      return acc
    }, {} as Record<string, any>)
  }
  
  clear(): void {
    this.results.clear()
  }
}

Performance Monitoring

Context Metrics

class ContextMetrics {
  private metrics: Map<string, Metric> = new Map()
  
  async measure<T>(
    name: string,
    operation: () => Promise<T>
  ): Promise<T> {
    const start = Date.now()
    
    try {
      const result = await operation()
      const duration = Date.now() - start
      
      this.record(name, duration, 'success')
      return result
      
    } catch (error) {
      const duration = Date.now() - start
      this.record(name, duration, 'error')
      throw error
    }
  }
  
  private record(
    name: string,
    duration: number,
    status: 'success' | 'error'
  ): void {
    const metric = this.metrics.get(name) || {
      count: 0,
      totalDuration: 0,
      avgDuration: 0,
      maxDuration: 0,
      minDuration: Infinity,
      errors: 0
    }
    
    metric.count++
    metric.totalDuration += duration
    metric.avgDuration = metric.totalDuration / metric.count
    metric.maxDuration = Math.max(metric.maxDuration, duration)
    metric.minDuration = Math.min(metric.minDuration, duration)
    
    if (status === 'error') {
      metric.errors++
    }
    
    this.metrics.set(name, metric)
    
    // Log slow operations
    if (duration > 1000) {
      console.warn(`Slow context operation ${name}: ${duration}ms`)
    }
  }
  
  getReport(): MetricsReport {
    return {
      operations: Array.from(this.metrics.entries()).map(([name, metric]) => ({
        name,
        ...metric
      })),
      totalOperations: Array.from(this.metrics.values()).reduce((sum, m) => sum + m.count, 0),
      totalDuration: Array.from(this.metrics.values()).reduce((sum, m) => sum + m.totalDuration, 0)
    }
  }
}

The Context System provides comprehensive project understanding through automatic discovery, intelligent caching, and smart injection, ensuring AI responses are always contextually relevant and accurate.