ask262/.opencode/plans/1776768885483-glowing-panda.md

model, title

model	title
accounts/fireworks/routers/kimi-k2p5-turbo	Add Proper Server Logs for MCP Server

Plan: Add Proper Server Logs for Ask262 MCP Server

Overview

Implement structured logging with OpenTelemetry-style tracing for both stdio and HTTP MCP servers, using Pino + @opentelemetry/api + pino-roll, writing JSON Lines to file, with DuckDB for querying.

Goals

• Trace nested calls (parent-child span relationships)
• Log all operations with timing information
• Structured format for external consumption
• Zero runtime dependencies for querying (DuckDB is CLI-only)
• Minimal footprint architecture

Architecture

┌─────────────────────────────────────┐
│  Pino + @opentelemetry/api          │
│  ↓                                  │
│  JSON Lines → ./logs/ask262.jsonl   │
│  ↓                                  │
│  DuckDB CLI (query when needed)     │
└─────────────────────────────────────┘

Configuration

Variable	Default	Description
ASK262_LOG_LEVEL	debug (HTTP), info (stdio)	File log level: trace/debug/info/warn/error
ASK262_LOG_DIR	./logs	Log directory path
ASK262_LOG_MAX_SIZE	100	Rotation threshold in MB

Console level is calculated as max('info', ASK262_LOG_LEVEL) - never shows debug, follows ASK262_LOG_LEVEL if higher.

Transport-aware defaults:

• HTTP server: ASK262_LOG_LEVEL=debug (verbose, includes all operations)
• Stdio server: ASK262_LOG_LEVEL=info (standard, shows operations but not debug details)

File Structure

• Format: JSON Lines (one JSON object per line)
• Path: ${ASK262_LOG_DIR}/ask262.jsonl
• Rotation: By system logrotate (100MB, managed by Coolify cron)
• Rotated files: ask262.jsonl.1, ask262.jsonl.2, etc. (numbered, not timestamped)
• Retention: Delete old files via Coolify cron (30 days)
• Permissions: Default (0o644)
• Sync: Synchronous writes (guaranteed durability)

Log Schema

Field	Type	Description
timestamp	ISO8601	With milliseconds
level	number	10=trace, 20=debug, 30=info, 40=warn, 50=error
trace_id	string	Request correlation ID
span_id	string	Unique operation ID
parent_span_id	string|null	Parent operation ID
component	string	http-server, stdio-server, search-tool, get-section-tool, engine262-runner, reranker, graph-explorer
operation	string	mcp_request, vector_search, section_fetch, code_execution, embedding_generate
duration_ms	number|null	Operation duration
msg	string	Human-readable message
client_ip	string|null	Request IP (HTTP only)
attributes	object	Key=value metadata
err	object|null	Error details with stack trace

Components

Trace ID Strategy

• HTTP: Generate new UUID per request (from header if available)
• Stdio: One process-scoped trace_id for entire session

Logger API

// Get component logger
const log = logger.forComponent('search-tool');

// Simple log
log.info('operation_started', { query: 'how does array.map work' });

// Timed operation (auto duration)
const op = log.start('vector_search', { query: 'how does array.map work' });
const results = await doSearch(query);
op.end({ results: results.length, provider: 'fireworks' });
// Logs on end with duration_ms automatically calculated

Dependencies

{
  "pino": "^8.x",
  "@opentelemetry/api": "^1.x"
  // pino-roll removed - using system logrotate via Coolify cron
}

Coolify/System Requirements:

• logrotate installed in container (standard in most Linux images)

Files to Create

1. coolify.yaml

Coolify deployment configuration with log rotation and cleanup cron jobs.

# coolify.yaml - Coolify deployment configuration
version: 1

services:
  - name: ask262
    
cronjobs:
  - name: "log-rotation"
    schedule: "*/5 * * * *"  # Every 5 minutes
    command: "logrotate -f /app/logrotate.conf 2>/dev/null || true"
  
  - name: "log-cleanup"
    schedule: "0 0 * * *"  # Daily at midnight
    command: "find ${ASK262_LOG_DIR:-/app/logs} -name 'ask262.jsonl.*' -mtime +${ASK262_LOG_RETENTION_DAYS:-30} -delete 2>/dev/null || true"

2. logrotate.conf

Log rotation configuration for system logrotate.

${ASK262_LOG_DIR}/ask262.jsonl {
    size 100M
    rotate 10
    compress
    delaycompress
    copytruncate
    notifempty
    missingok
}

3. src/lib/logger.ts

Central logging module with component binding and auto-duration operations.

Key features:

• Component-bound loggers: const log = logger.forComponent('search-tool')
• Timed operations: const op = log.start('vector_search', attrs); op.end(resultAttrs)
• Automatic trace context injection via @opentelemetry/api
• Dual transport: JSON Lines to file, pretty to console (filtered)
• Redaction of sensitive fields

Pino configuration:

const logger = pino({
  level: getFileLogLevel(),  // From ASK262_LOG_LEVEL env
  redact: {
    paths: ['FIREWORKS_API_KEY', 'api_key', 'authorization'],
    remove: true
  },
  mixin() {
    const span = trace.getSpan(context.active());
    if (span) {
      const ctx = span.spanContext();
      return {
        trace_id: ctx.traceId,
        span_id: ctx.spanId,
        trace_flags: ctx.traceFlags,
      };
    }
    return {};
  },
  timestamp: () => `,"timestamp":"${new Date().toISOString()}"`,
}, pino.multistream([
  // File: JSON, all levels per ASK262_LOG_LEVEL (no rotation here - system handles it)
  { 
    stream: pino.destination({ 
      dest: join(ASK262_LOG_DIR, 'ask262.jsonl'),
      sync: true  // Synchronous writes
    }),
    level: getFileLogLevel()
  },
  // Console: Pretty, filtered to max('info', ASK262_LOG_LEVEL)
  {
    stream: pretty({ colorize: true }),
    level: getConsoleLogLevel()  // max('info', ASK262_LOG_LEVEL)
  }
]));

4. src/lib/tracing.ts

OpenTelemetry trace context management using AsyncLocalStorage.

Key features:

• createTraceContext(traceId?: string) - Initialize trace at entry point
• withSpan(operation, attributes, fn) - Wrap operations with automatic parent-child linking
• Uses @opentelemetry/api for context propagation
• Automatic span ID generation

Files to Modify

5. src/mcp-server-http.ts

Changes:

• Import logger and tracing modules
• Create trace context at request entry point
• Extract client IP from request headers
• Add startup/shutdown logs (minimal)
• Add logging around tool invocations

// Startup
log.info('server_started', { port: ASK262_PORT, transport: 'http' });

// Per request
const traceId = req.headers['x-request-id'] || crypto.randomUUID();
await withSpan('mcp_request', { tool: toolName, client_ip: clientIp }, async () => {
  const log = logger.forComponent('http-server');
  const op = log.start('handle_request', { tool: toolName });
  const result = await toolHandler(args);
  op.end({ status: 'success', result_count: result.length });
  return result;
});

// Shutdown
log.info('server_shutting_down', { signal: 'SIGTERM' });

6. src/mcp-server-stdio.ts

Changes:

• Import logger and tracing modules
• Create process-scoped trace_id on startup
• Add startup/shutdown logs (minimal)
• Add logging matching HTTP server pattern (no IP)

// Startup - one trace_id for entire session
const sessionTraceId = crypto.randomUUID();
log.info('server_started', { transport: 'stdio', trace_id: sessionTraceId });

// Per message - uses same trace_id via AsyncLocalStorage
await withSpan('mcp_request', { tool: toolName }, async () => {
  // Same pattern as HTTP
});

7. src/agent-tools/searchSpecSections.ts

Changes:

• Import component logger
• Add operation spans for:
  • Vector search query
  • Embedding generation (if cached vs fresh)
  • Reranking (if enabled)
  • Result formatting
• Log query parameters, result counts, timing
• Log errors with full context

8. src/agent-tools/getSectionContent.ts

Changes:

• Add logging for section lookup
• Log section IDs found/not found
• Log content size
• Log timing for LanceDB queries

9. src/agent-tools/evaluateInEngine262.ts + runner

Changes:

• Add parent-child span tracking across process boundary
• Pass trace context to runner via env or message
• Log code execution request
• Runner logs as child spans
• Log execution time
• Log errors with stack traces

10. src/agent-tools/graphExplorer.ts

Changes:

• Log graph traversal operations
• Log node/edge counts
• Log query timing

11. src/agent-tools/reranker.ts

Changes:

• Log reranking requests
• Log API success/failure
• Log timing

12. src/lib/embeddings-factory.ts

Changes:

• Log provider selection
• Log embedding generation batches
• Log errors with provider context

13. src/lib/fireworks-embeddings.ts

Changes:

• Log rate limit retries
• Log API timing
• Log batch sizes

14. .env.example

Add:

# Logging configuration
# HTTP server defaults to 'debug', stdio defaults to 'info'
ASK262_LOG_LEVEL=info           # trace, debug, info, warn, error
ASK262_LOG_DIR=./logs           # Log file directory
ASK262_LOG_MAX_SIZE=100         # Max file size in MB before rotation
ASK262_LOG_RETENTION_DAYS=30    # Days to keep rotated logs (0=keep forever)

15. .gitignore

Add:

# Logs
/logs/
*.log
*.jsonl

DuckDB Query Examples

Installation

brew install duckdb  # macOS
# or download from https://duckdb.org/

Common Queries

-- View all logs for a trace
SELECT timestamp, component, operation, duration_ms, msg 
FROM 'logs/ask262.jsonl' 
WHERE trace_id = '4bf92f3577b34da6a3ce929d0e0e4736' 
ORDER BY time;

-- Find slow operations
SELECT component, operation, 
       AVG(duration_ms) as avg_ms, 
       MAX(duration_ms) as max_ms,
       COUNT(*) as count
FROM 'logs/ask262.jsonl' 
WHERE duration_ms IS NOT NULL 
GROUP BY component, operation 
ORDER BY avg_ms DESC;

-- Error analysis
SELECT component, operation, COUNT(*) as errors 
FROM 'logs/ask262.jsonl' 
WHERE level >= 40 
GROUP BY component, operation;

-- Request volume over time
SELECT date_trunc('hour', timestamp::TIMESTAMP) as hour, 
       COUNT(*) as requests
FROM 'logs/ask262.jsonl'
WHERE component = 'http-server' AND operation = 'mcp_request'
GROUP BY hour
ORDER BY hour;

-- Trace duration (time from first to last span)
SELECT trace_id, 
       MIN(timestamp) as start_time,
       MAX(timestamp) as end_time,
       MAX(timestamp)::TIMESTAMP - MIN(timestamp)::TIMESTAMP as total_duration
FROM 'logs/ask262.jsonl'
WHERE trace_id IS NOT NULL
GROUP BY trace_id
ORDER BY total_duration DESC
LIMIT 10;

Implementation Order

1. Coolify config (coolify.yaml, logrotate.conf) - Deployment and rotation setup
2. Core logger (src/lib/logger.ts) - Pino setup, transports, redaction
3. Tracing module (src/lib/tracing.ts) - OTel context, span management
4. HTTP server (src/mcp-server-http.ts) - Entry point, test end-to-end
5. Stdio server (src/mcp-server-stdio.ts) - Same pattern as HTTP
6. Agent tools - searchSpecSections, getSectionContent, evaluateInEngine262, graphExplorer, reranker
7. Library files - embeddings-factory, fireworks-embeddings
8. Documentation - .env.example, .gitignore
9. Testing - Verify all components log correctly

Testing Plan

1. Unit tests: Verify logger creates correct JSON structure
2. Integration tests:
   • Make MCP requests, verify logs created
   • Check trace_id consistency across nested calls
   • Verify span parent-child relationships
3. Manual verification:
   • Query logs with DuckDB
   • Verify timing calculations
   • Check error logging includes stack traces
   • Test log rotation at 100MB
   • Verify console pretty output

Verification Steps

After implementation:

1. Install dependencies: bun add pino @opentelemetry/api pino-roll
2. Run HTTP server: bun run ask262-http
3. Check logs directory created: ls -la logs/
4. Make test request via MCP Inspector or curl
5. Query with DuckDB: duckdb -c "SELECT * FROM 'logs/ask262.jsonl' LIMIT 5"
6. Check console output is pretty-printed
7. Run stdio server: bun run ask262-stdio
8. Send MCP message via stdin
9. Verify both servers produce consistent log format
10. Test rotation: Send many requests, verify rotation at 100MB
11. Test error logging: Trigger error, verify stack trace in logs

Error Handling

Log directory unwritable: Server crashes on startup with clear error message.

Log rotation fails: Continue with current file, log warning (don't crash on rotation failure).

Disk full: Synchronous writes will fail, error propagated up and logged to console.

Success Criteria

• All tool operations logged with timing
• Nested calls have trace_id and parent_span_id relationships
• HTTP server logs include client IP
• Stdio server has process-scoped trace_id
• Console shows pretty output, filtered to appropriate level
• File has JSON Lines format
• DuckDB can query logs without errors
• Log rotation works at 100MB with timestamp suffix
• Error logs include full context and stack traces
• API keys redacted from all logs
• No impact on MCP protocol communication
• Server crashes if log directory unwritable
• Minimal startup/shutdown logs present