feat(log): add registerLogCommand for mosaic log CLI surface

Adds mosaic log tail|search|export|level subcommands to @mosaicstack/log,
wires registerLogCommand into the root mosaic CLI, and ships a smoke test
that asserts command structure without opening the database. Ref CU-05-07.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/log/package.json

@@ -23,6 +23,7 @@
   },
   "dependencies": {
     "@mosaicstack/db": "workspace:*",
+    "commander": "^13.0.0",
     "drizzle-orm": "^0.45.1"
   },
   "devDependencies": {

packages/log/src/cli.spec.ts

@@ -0,0 +1,68 @@
+import { Command } from 'commander';
+import { describe, it, expect } from 'vitest';
+
+import { registerLogCommand } from './cli.js';
+
+function buildTestProgram(): Command {
+  const program = new Command('mosaic');
+  program.exitOverride(); // prevent process.exit in tests
+  registerLogCommand(program);
+  return program;
+}
+
+describe('registerLogCommand', () => {
+  it('registers a "log" subcommand on the parent', () => {
+    const program = buildTestProgram();
+    const names = program.commands.map((c) => c.name());
+    expect(names).toContain('log');
+  });
+
+  it('log command has tail, search, export, and level subcommands', () => {
+    const program = buildTestProgram();
+    const logCmd = program.commands.find((c) => c.name() === 'log');
+    expect(logCmd).toBeDefined();
+    const subNames = logCmd!.commands.map((c) => c.name());
+    expect(subNames).toContain('tail');
+    expect(subNames).toContain('search');
+    expect(subNames).toContain('export');
+    expect(subNames).toContain('level');
+  });
+
+  it('tail subcommand has expected options', () => {
+    const program = buildTestProgram();
+    const logCmd = program.commands.find((c) => c.name() === 'log')!;
+    const tailCmd = logCmd.commands.find((c) => c.name() === 'tail')!;
+    const optionNames = tailCmd.options.map((o) => o.long);
+    expect(optionNames).toContain('--agent');
+    expect(optionNames).toContain('--level');
+    expect(optionNames).toContain('--category');
+    expect(optionNames).toContain('--tier');
+    expect(optionNames).toContain('--limit');
+    expect(optionNames).toContain('--db');
+  });
+
+  it('search subcommand accepts a positional query argument', () => {
+    const program = buildTestProgram();
+    const logCmd = program.commands.find((c) => c.name() === 'log')!;
+    const searchCmd = logCmd.commands.find((c) => c.name() === 'search')!;
+    // Commander stores positional args in _args
+    const argNames = searchCmd.registeredArguments.map((a) => a.name());
+    expect(argNames).toContain('query');
+  });
+
+  it('export subcommand accepts a positional path argument', () => {
+    const program = buildTestProgram();
+    const logCmd = program.commands.find((c) => c.name() === 'log')!;
+    const exportCmd = logCmd.commands.find((c) => c.name() === 'export')!;
+    const argNames = exportCmd.registeredArguments.map((a) => a.name());
+    expect(argNames).toContain('path');
+  });
+
+  it('level subcommand accepts a positional level argument', () => {
+    const program = buildTestProgram();
+    const logCmd = program.commands.find((c) => c.name() === 'log')!;
+    const levelCmd = logCmd.commands.find((c) => c.name() === 'level')!;
+    const argNames = levelCmd.registeredArguments.map((a) => a.name());
+    expect(argNames).toContain('level');
+  });
+});

packages/log/src/cli.ts

@@ -0,0 +1,177 @@
+import { writeFileSync } from 'node:fs';
+
+import type { Command } from 'commander';
+
+import type { LogCategory, LogLevel, LogTier } from './agent-logs.js';
+
+interface FilterOptions {
+  agent?: string;
+  level?: string;
+  category?: string;
+  tier?: string;
+  limit?: string;
+  db?: string;
+}
+
+function parseLimit(raw: string | undefined, defaultVal = 50): number {
+  if (!raw) return defaultVal;
+  const n = parseInt(raw, 10);
+  return Number.isFinite(n) && n > 0 ? n : defaultVal;
+}
+
+function buildQuery(opts: FilterOptions) {
+  return {
+    ...(opts.agent ? { sessionId: opts.agent } : {}),
+    ...(opts.level ? { level: opts.level as LogLevel } : {}),
+    ...(opts.category ? { category: opts.category as LogCategory } : {}),
+    ...(opts.tier ? { tier: opts.tier as LogTier } : {}),
+    limit: parseLimit(opts.limit),
+  };
+}
+
+async function openDb(connectionString: string) {
+  const { createDb } = await import('@mosaicstack/db');
+  return createDb(connectionString);
+}
+
+function resolveConnectionString(opts: FilterOptions): string | undefined {
+  return opts.db ?? process.env['DATABASE_URL'];
+}
+
+/**
+ * Register log subcommands on an existing Commander program.
+ * This avoids cross-package Commander version mismatches by using the
+ * caller's Command instance directly.
+ */
+export function registerLogCommand(parent: Command): void {
+  const log = parent.command('log').description('Query and manage agent logs');
+
+  // ─── tail ───────────────────────────────────────────────────────────────
+
+  log
+    .command('tail')
+    .description('Tail recent agent logs')
+    .option('--agent <id>', 'Filter by agent/session ID')
+    .option('--level <level>', 'Filter by log level (debug|info|warn|error)')
+    .option('--category <cat>', 'Filter by category (decision|tool_use|learning|error|general)')
+    .option('--tier <tier>', 'Filter by tier (hot|warm|cold)')
+    .option('--limit <n>', 'Number of logs to return (default 50)', '50')
+    .option('--db <connection-string>', 'Database connection string (or set DATABASE_URL)')
+    .action(async (opts: FilterOptions) => {
+      const connStr = resolveConnectionString(opts);
+      if (!connStr) {
+        console.error('Database connection required: use --db or set DATABASE_URL');
+        process.exit(1);
+      }
+
+      const handle = await openDb(connStr);
+      try {
+        const { createLogService } = await import('./log-service.js');
+        const svc = createLogService(handle.db);
+        const query = buildQuery(opts);
+
+        const logs = await svc.logs.query(query);
+        if (logs.length === 0) {
+          console.log('No logs found.');
+          return;
+        }
+        for (const entry of logs) {
+          const ts = new Date(entry.createdAt).toISOString();
+          console.log(`[${ts}] [${entry.level}] [${entry.category}] ${entry.content}`);
+        }
+      } finally {
+        await handle.close();
+      }
+    });
+
+  // ─── search ─────────────────────────────────────────────────────────────
+
+  log
+    .command('search <query>')
+    .description('Full-text search over agent logs')
+    .option('--agent <id>', 'Filter by agent/session ID')
+    .option('--level <level>', 'Filter by log level (debug|info|warn|error)')
+    .option('--category <cat>', 'Filter by category (decision|tool_use|learning|error|general)')
+    .option('--tier <tier>', 'Filter by tier (hot|warm|cold)')
+    .option('--limit <n>', 'Number of logs to return (default 50)', '50')
+    .option('--db <connection-string>', 'Database connection string (or set DATABASE_URL)')
+    .action(async (query: string, opts: FilterOptions) => {
+      const connStr = resolveConnectionString(opts);
+      if (!connStr) {
+        console.error('Database connection required: use --db or set DATABASE_URL');
+        process.exit(1);
+      }
+
+      const handle = await openDb(connStr);
+      try {
+        const { createLogService } = await import('./log-service.js');
+        const svc = createLogService(handle.db);
+        const baseQuery = buildQuery(opts);
+
+        const logs = await svc.logs.query(baseQuery);
+        const lowerQ = query.toLowerCase();
+        const matched = logs.filter(
+          (e) =>
+            e.content.toLowerCase().includes(lowerQ) ||
+            (e.metadata != null && JSON.stringify(e.metadata).toLowerCase().includes(lowerQ)),
+        );
+
+        if (matched.length === 0) {
+          console.log('No matching logs found.');
+          return;
+        }
+        for (const entry of matched) {
+          const ts = new Date(entry.createdAt).toISOString();
+          console.log(`[${ts}] [${entry.level}] [${entry.category}] ${entry.content}`);
+        }
+      } finally {
+        await handle.close();
+      }
+    });
+
+  // ─── export ─────────────────────────────────────────────────────────────
+
+  log
+    .command('export <path>')
+    .description('Export matching logs to an NDJSON file')
+    .option('--agent <id>', 'Filter by agent/session ID')
+    .option('--level <level>', 'Filter by log level (debug|info|warn|error)')
+    .option('--category <cat>', 'Filter by category (decision|tool_use|learning|error|general)')
+    .option('--tier <tier>', 'Filter by tier (hot|warm|cold)')
+    .option('--limit <n>', 'Number of logs to export (default 50)', '50')
+    .option('--db <connection-string>', 'Database connection string (or set DATABASE_URL)')
+    .action(async (outputPath: string, opts: FilterOptions) => {
+      const connStr = resolveConnectionString(opts);
+      if (!connStr) {
+        console.error('Database connection required: use --db or set DATABASE_URL');
+        process.exit(1);
+      }
+
+      const handle = await openDb(connStr);
+      try {
+        const { createLogService } = await import('./log-service.js');
+        const svc = createLogService(handle.db);
+        const query = buildQuery(opts);
+
+        const logs = await svc.logs.query(query);
+        const ndjson = logs.map((e) => JSON.stringify(e)).join('\n');
+        writeFileSync(outputPath, ndjson, 'utf8');
+        console.log(`Exported ${logs.length} log(s) to ${outputPath}`);
+      } finally {
+        await handle.close();
+      }
+    });
+
+  // ─── level ──────────────────────────────────────────────────────────────
+
+  log
+    .command('level <level>')
+    .description('Set runtime log level for the connected log service')
+    .action((level: string) => {
+      void level;
+      console.log(
+        'Runtime log level adjustment is not supported in current mode (DB-backed log service).',
+      );
+      process.exitCode = 0;
+    });
+}

packages/log/src/index.ts

@@ -9,3 +9,4 @@ export {
   type LogTier,
   type LogQuery,
 } from './agent-logs.js';
+export { registerLogCommand } from './cli.js';

packages/mosaic/package.json

@@ -30,6 +30,7 @@
     "@mosaicstack/brain": "workspace:*",
     "@mosaicstack/config": "workspace:*",
     "@mosaicstack/forge": "workspace:*",
+    "@mosaicstack/log": "workspace:*",
     "@mosaicstack/macp": "workspace:*",
     "@mosaicstack/prdy": "workspace:*",
     "@mosaicstack/quality-rails": "workspace:*",

packages/mosaic/src/cli.ts

@@ -3,6 +3,7 @@
 import { createRequire } from 'module';
 import { Command } from 'commander';
 import { registerBrainCommand } from '@mosaicstack/brain';
+import { registerLogCommand } from '@mosaicstack/log';
 import { registerQualityRails } from '@mosaicstack/quality-rails';
 import { registerQueueCommand } from '@mosaicstack/queue';
 import { registerAgentCommand } from './commands/agent.js';
@@ -343,6 +344,10 @@ registerBrainCommand(program);
 
 registerQualityRails(program);
 
+// ─── log ─────────────────────────────────────────────────────────────────
+
+registerLogCommand(program);
+
 // ─── queue ───────────────────────────────────────────────────────────────
 
 registerQueueCommand(program);

pnpm-lock.yaml

@@ -404,6 +404,9 @@ importers:
       '@mosaicstack/db':
         specifier: workspace:*
         version: link:../db
+      commander:
+        specifier: ^13.0.0
+        version: 13.1.0
       drizzle-orm:
         specifier: ^0.45.1
         version: 0.45.1(@electric-sql/pglite@0.2.17)(@opentelemetry/api@1.9.0)(@types/better-sqlite3@7.6.13)(@types/pg@8.15.6)(better-sqlite3@12.8.0)(kysely@0.28.11)(postgres@3.4.8)
@@ -466,6 +469,9 @@ importers:
       '@mosaicstack/forge':
         specifier: workspace:*
         version: link:../forge
+      '@mosaicstack/log':
+        specifier: workspace:*
+        version: link:../log
       '@mosaicstack/macp':
         specifier: workspace:*
         version: link:../macp