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Lisa edited this page Dec 16, 2025 · 21 revisions

CKB Configuration Guide

Overview

CKB configuration is stored in .ckb/config.json in your repository root. This file is created when you run ckb init.

Configuration File

Location

your-repo/
└── .ckb/
    ├── config.json    # Configuration
    └── ckb.db         # SQLite database

Full Schema

{
  "version": 5,
  "backends": {
    "scip": {
      "enabled": true,
      "indexPath": "index.scip",
      "autoReindex": false
    },
    "lsp": {
      "enabled": true,
      "servers": {}
    },
    "git": {
      "enabled": true
    }
  },
  "queryPolicy": {
    "backendLadder": ["scip", "lsp", "git"],
    "mergeStrategy": "prefer-first"
  },
  "lspSupervisor": {
    "startupTimeoutMs": 30000,
    "shutdownTimeoutMs": 5000,
    "maxRestarts": 3,
    "healthCheckIntervalMs": 60000
  },
  "modules": {
    "detectStrategy": "auto",
    "customRoots": []
  },
  "importScan": {
    "enabled": true,
    "maxDepth": 10
  },
  "cache": {
    "queryCacheTtlSeconds": 300,
    "viewCacheTtlSeconds": 3600,
    "negativeCacheTtlSeconds": 60,
    "maxCacheEntries": 10000
  },
  "budget": {
    "maxModules": 10,
    "maxSymbolsPerModule": 5,
    "maxImpactItems": 20,
    "maxDrilldowns": 5,
    "estimatedMaxTokens": 4000
  },
  "backendLimits": {
    "maxRefsPerQuery": 10000,
    "maxSymbolsPerSearch": 1000,
    "maxFilesScanned": 5000,
    "maxFileSizeBytes": 1048576,
    "maxUnionModeTimeMs": 60000,
    "maxScipIndexSizeMb": 500
  },
  "privacy": {
    "redactPaths": false,
    "excludePatterns": []
  },
  "logging": {
    "level": "info",
    "format": "human"
  }
}

Configuration Sections

version

Schema version number. Current version is 5.

{
  "version": 5
}

backends

Configure which backends are enabled and their settings.

backends.scip

SCIP (Source Code Intelligence Protocol) backend.

Field Type Default Description
enabled bool true Enable SCIP backend
indexPath string "index.scip" Path to SCIP index file
autoReindex bool false Automatically regenerate stale index 
{
  "backends": {
    "scip": {
      "enabled": true,
      "indexPath": "index.scip",
      "autoReindex": false
    }
  }
}

backends.lsp

Language Server Protocol backend.

Field Type Default Description
enabled bool true Enable LSP backend
servers object {} Language-specific server configs 
{
  "backends": {
    "lsp": {
      "enabled": true,
      "servers": {
        "go": {
          "command": "gopls",
          "args": ["serve"]
        },
        "typescript": {
          "command": "typescript-language-server",
          "args": ["--stdio"]
        }
      }
    }
  }
}

backends.git

Git backend for fallback operations.

Field Type Default Description
enabled bool true Enable Git backend

queryPolicy

Controls how queries are routed and merged.

Field Type Default Description
backendLadder string[] ["scip", "lsp", "git"] Backend priority order
mergeStrategy string "prefer-first" How to merge results

Merge Strategies:

  • prefer-first: Use first successful backend response
  • union: Merge all backend responses, deduplicate
{
  "queryPolicy": {
    "backendLadder": ["scip", "lsp", "git"],
    "mergeStrategy": "prefer-first"
  }
}

lspSupervisor

Controls LSP server lifecycle management.

Field Type Default Description
startupTimeoutMs int 30000 Max time to wait for server start
shutdownTimeoutMs int 5000 Max time to wait for graceful shutdown
maxRestarts int 3 Max restart attempts before giving up
healthCheckIntervalMs int 60000 Health check interval

modules

Module detection settings.

Field Type Default Description
detectStrategy string "auto" Detection strategy
customRoots string[] [] Additional module roots

Detection Strategies:

  • auto: Detect based on language markers (go.mod, package.json, etc.)
  • manual: Only use customRoots
  • directory: Treat each top-level directory as a module
{
  "modules": {
    "detectStrategy": "auto",
    "customRoots": ["internal/legacy"]
  }
}

importScan

Import/dependency scanning settings.

Field Type Default Description
enabled bool true Enable import scanning
maxDepth int 10 Maximum dependency depth

cache

Cache tier configuration.

Field Type Default Description
queryCacheTtlSeconds int 300 Query cache TTL (5 min)
viewCacheTtlSeconds int 3600 View cache TTL (1 hour)
negativeCacheTtlSeconds int 60 Negative cache TTL
maxCacheEntries int 10000 Max entries per cache tier 
{
  "cache": {
    "queryCacheTtlSeconds": 300,
    "viewCacheTtlSeconds": 3600,
    "negativeCacheTtlSeconds": 60,
    "maxCacheEntries": 10000
  }
}

budget

Response budget limits for LLM optimization.

Field Type Default Description
maxModules int 10 Max modules in response
maxSymbolsPerModule int 5 Max symbols per module
maxImpactItems int 20 Max impact items
maxDrilldowns int 5 Max drilldown suggestions
estimatedMaxTokens int 4000 Target token budget 
{
  "budget": {
    "maxModules": 10,
    "maxSymbolsPerModule": 5,
    "maxImpactItems": 20,
    "maxDrilldowns": 5,
    "estimatedMaxTokens": 4000
  }
}

backendLimits

Hard limits to protect against resource exhaustion.

Field Type Default Description
maxRefsPerQuery int 10000 Max references per query
maxSymbolsPerSearch int 1000 Max symbols per search
maxFilesScanned int 5000 Max files to scan
maxFileSizeBytes int 1048576 Max file size (1 MB)
maxUnionModeTimeMs int 60000 Max time for union merge
maxScipIndexSizeMb int 500 SCIP index size warning

privacy

Privacy and redaction settings.

Field Type Default Description
redactPaths bool false Redact file paths in responses
excludePatterns string[] [] Glob patterns to exclude 
{
  "privacy": {
    "redactPaths": false,
    "excludePatterns": [
      "**/secrets/**",
      "**/*.env"
    ]
  }
}

logging

Logging configuration.

Field Type Default Description
level string "info" Log level (debug, info, warn, error)
format string "human" Output format (human, json) 
{
  "logging": {
    "level": "info",
    "format": "human"
  }
}

Environment Variables

Configuration can be overridden with environment variables:

Variable Description
CKB_LOG_LEVEL Override log level
CKB_LOG_FORMAT Override log format
CKB_CONFIG_PATH Custom config path

Examples

Minimal Configuration

{
  "version": 5,
  "backends": {
    "scip": { "enabled": true },
    "lsp": { "enabled": false },
    "git": { "enabled": true }
  }
}

High-Performance Configuration

{
  "version": 5,
  "backends": {
    "scip": {
      "enabled": true,
      "autoReindex": true
    },
    "lsp": { "enabled": false },
    "git": { "enabled": true }
  },
  "queryPolicy": {
    "backendLadder": ["scip", "git"],
    "mergeStrategy": "prefer-first"
  },
  "cache": {
    "queryCacheTtlSeconds": 600,
    "viewCacheTtlSeconds": 7200,
    "maxCacheEntries": 50000
  }
}

Large Codebase Configuration

{
  "version": 5,
  "budget": {
    "maxModules": 20,
    "maxSymbolsPerModule": 10,
    "maxImpactItems": 50,
    "estimatedMaxTokens": 8000
  },
  "backendLimits": {
    "maxRefsPerQuery": 50000,
    "maxSymbolsPerSearch": 5000,
    "maxFilesScanned": 20000
  }
}

Validation

Validate your configuration:

ckb doctor

This checks:

  • JSON syntax
  • Schema version compatibility
  • Required fields
  • Value ranges
  • Backend availability

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