feat: add verbose/trace output for API latency debugging (-v to -vvvv)

src/index.ts

@@ -21,13 +21,15 @@ import { registerTaskCommand } from './commands/task.js'
 import { registerTodayCommand } from './commands/today.js'
 import { registerUpcomingCommand } from './commands/upcoming.js'
 import { registerWorkspaceCommand } from './commands/workspace.js'
+import { initializeLogger } from './lib/logger.js'
 
 program
     .name('td')
     .description('Todoist CLI')
     .version(packageJson.version)
     .option('--no-spinner', 'Disable loading animations')
     .option('--progress-jsonl [path]', 'Output progress events as JSONL to stderr or file')
+    .option('-v, --verbose', 'Increase output verbosity (repeat up to 4x: -v, -vv, -vvv, -vvvv)')
     .addHelpText(
         'after',
         `
@@ -56,6 +58,9 @@ registerFilterCommand(program)
 registerNotificationCommand(program)
 registerSkillCommand(program)
 
+// Initialize verbose logger before parsing so it captures all -v flags
+initializeLogger()
+
 program.parseAsync().catch((err: Error) => {
     console.error(err.message)
     process.exit(1)

src/lib/logger.ts

@@ -0,0 +1,266 @@
+/**
+ * Verbose logging module for debugging API latency and CLI behavior.
+ *
+ * Verbosity levels (stackable -v flags):
+ *   -v     (1) INFO    : commands invoked, API endpoints hit, response status + total timing
+ *   -vv    (2) DETAIL  : request parameters, response metadata, pagination progress
+ *   -vvv   (3) DEBUG   : reference resolution steps, HTTP headers, rate-limit info
+ *   -vvvv  (4) TRACE   : full request/response headers, body sizes, connection details
+ *
+ * All output goes to stderr with prefixed tags so it never pollutes stdout data.
+ * Can also be activated via TD_VERBOSE=1..4 environment variable.
+ */
+
+export const Verbosity = {
+    SILENT: 0,
+    INFO: 1,
+    DETAIL: 2,
+    DEBUG: 3,
+    TRACE: 4,
+} as const
+
+export type Verbosity = (typeof Verbosity)[keyof typeof Verbosity]
+
+const LEVEL_TAG: Record<number, string> = {
+    [Verbosity.INFO]: 'info',
+    [Verbosity.DETAIL]: 'detail',
+    [Verbosity.DEBUG]: 'debug',
+    [Verbosity.TRACE]: 'trace',
+}
+
+class Logger {
+    private level: Verbosity = Verbosity.SILENT
+
+    /** Set verbosity from parsed CLI flags or environment. */
+    initialize(): void {
+        // Environment variable takes precedence if set
+        const envLevel = process.env.TD_VERBOSE
+        if (envLevel) {
+            const parsed = parseInt(envLevel, 10)
+            if (parsed >= Verbosity.INFO && parsed <= Verbosity.TRACE) {
+                this.level = parsed as Verbosity
+            }
+        }
+
+        // Count -v flags in argv (supports -v, -vv, -vvv, -vvvv, and repeated --verbose)
+        const args = process.argv.slice(2)
+        let cliLevel = 0
+        for (const arg of args) {
+            if (arg === '--verbose') {
+                cliLevel += 1
+            } else if (/^-v+$/.test(arg)) {
+                // -v = 1, -vv = 2, -vvv = 3, -vvvv = 4
+                cliLevel += arg.length - 1
+            }
+        }
+
+        // CLI flags override env var if higher
+        if (cliLevel > 0) {
+            this.level = Math.min(cliLevel, Verbosity.TRACE) as Verbosity
+        }
+
+        if (this.level >= Verbosity.INFO) {
+            this.log(Verbosity.INFO, `verbose logging enabled (level=${this.level})`)
+        }
+    }
+
+    getLevel(): Verbosity {
+        return this.level
+    }
+
+    isEnabled(level: Verbosity = Verbosity.INFO): boolean {
+        return this.level >= level
+    }
+
+    /** Core log method. Only emits if current verbosity >= requested level. */
+    log(level: Verbosity, message: string, data?: Record<string, unknown>): void {
+        if (this.level < level) return
+
+        const tag = LEVEL_TAG[level] ?? 'log'
+        const ts = new Date().toISOString()
+        let line = `[td:${tag}] ${ts} ${message}`
+
+        if (data && Object.keys(data).length > 0) {
+            const parts: string[] = []
+            for (const [key, value] of Object.entries(data)) {
+                if (value === undefined || value === null) continue
+                parts.push(`${key}=${typeof value === 'object' ? JSON.stringify(value) : value}`)
+            }
+            if (parts.length > 0) {
+                line += ` | ${parts.join(' ')}`
+            }
+        }
+
+        process.stderr.write(`${line}\n`)
+    }
+
+    /** Level-specific convenience methods. */
+    info(message: string, data?: Record<string, unknown>): void {
+        this.log(Verbosity.INFO, message, data)
+    }
+
+    detail(message: string, data?: Record<string, unknown>): void {
+        this.log(Verbosity.DETAIL, message, data)
+    }
+
+    debug(message: string, data?: Record<string, unknown>): void {
+        this.log(Verbosity.DEBUG, message, data)
+    }
+
+    trace(message: string, data?: Record<string, unknown>): void {
+        this.log(Verbosity.TRACE, message, data)
+    }
+
+    /** Log timing of an async operation. Returns the operation result. */
+    async timed<T>(
+        level: Verbosity,
+        label: string,
+        operation: () => Promise<T>,
+        extraData?: Record<string, unknown>,
+    ): Promise<T> {
+        if (this.level < level) {
+            return operation()
+        }
+
+        const start = performance.now()
+        this.log(level, `${label} ...started`, extraData)
+
+        try {
+            const result = await operation()
+            const durationMs = performance.now() - start
+            this.log(level, `${label} ...done`, {
+                ...extraData,
+                duration_ms: Math.round(durationMs),
+            })
+            return result
+        } catch (error) {
+            const durationMs = performance.now() - start
+            this.log(level, `${label} ...FAILED`, {
+                ...extraData,
+                duration_ms: Math.round(durationMs),
+                error: error instanceof Error ? error.message : String(error),
+            })
+            throw error
+        }
+    }
+}
+
+// Global singleton
+let logger: Logger | null = null
+
+export function getLogger(): Logger {
+    if (!logger) {
+        logger = new Logger()
+    }
+    return logger
+}
+
+export function initializeLogger(): void {
+    const log = getLogger()
+    log.initialize()
+
+    // When verbose, patch globalThis.fetch so SDK-internal HTTP calls are also logged.
+    // This is the only way to get HTTP-level visibility for @doist/todoist-api-typescript
+    // since it uses fetch() internally and doesn't expose hooks.
+    if (log.isEnabled()) {
+        patchGlobalFetch()
+    }
+}
+
+/** Save original fetch and replace with logging wrapper. */
+function patchGlobalFetch(): void {
+    const originalFetch = globalThis.fetch
+
+    globalThis.fetch = async (input: RequestInfo | URL, init?: RequestInit): Promise<Response> => {
+        const log = getLogger()
+        const urlStr =
+            typeof input === 'string' ? input : input instanceof URL ? input.toString() : input.url
+        const method =
+            init?.method ?? (typeof input === 'object' && 'method' in input ? input.method : 'GET')
+        const urlObj = new URL(urlStr)
+
+        log.info(`fetch ${method} ${urlObj.pathname}`)
+        log.detail(`fetch ${method} ${urlStr}`)
+
+        // Log request body size at DETAIL
+        if (init?.body) {
+            const bodyStr =
+                typeof init.body === 'string'
+                    ? init.body
+                    : init.body instanceof URLSearchParams
+                      ? init.body.toString()
+                      : null
+            if (bodyStr) {
+                log.detail('request body', { size_bytes: bodyStr.length })
+                if (init.body instanceof URLSearchParams) {
+                    log.trace('request body keys', { keys: Array.from(init.body.keys()) })
+                }
+            }
+        }
+
+        // Log request headers at TRACE (redact Authorization)
+        if (log.isEnabled(Verbosity.TRACE) && init?.headers) {
+            const hdrs: Record<string, string> = {}
+            if (init.headers instanceof Headers) {
+                init.headers.forEach((v, k) => {
+                    hdrs[k] = k.toLowerCase() === 'authorization' ? '[REDACTED]' : v
+                })
+            } else if (typeof init.headers === 'object') {
+                for (const [k, v] of Object.entries(init.headers)) {
+                    hdrs[k] = k.toLowerCase() === 'authorization' ? '[REDACTED]' : String(v)
+                }
+            }
+            log.trace('request headers', hdrs)
+        }
+
+        const startTime = performance.now()
+        const response = await originalFetch(input, init)
+        const durationMs = Math.round(performance.now() - startTime)
+
+        // INFO: status + timing
+        log.info(`fetch ${method} ${urlObj.pathname} => ${response.status}`, {
+            duration_ms: durationMs,
+        })
+
+        // DETAIL: content-length
+        const contentLength = response.headers.get('content-length')
+        if (contentLength) {
+            log.detail('response', { content_length: contentLength })
+        }
+
+        // DEBUG: rate-limit and diagnostic headers
+        const diagHeaders: Record<string, string> = {}
+        for (const name of [
+            'x-request-id',
+            'x-ratelimit-limit',
+            'x-ratelimit-remaining',
+            'x-ratelimit-reset',
+            'retry-after',
+            'cf-ray',
+        ]) {
+            const val = response.headers.get(name)
+            if (val) diagHeaders[name] = val
+        }
+        if (Object.keys(diagHeaders).length > 0) {
+            log.debug('response headers', diagHeaders)
+        }
+
+        // TRACE: all response headers
+        if (log.isEnabled(Verbosity.TRACE)) {
+            const allHeaders: Record<string, string> = {}
+            response.headers.forEach((value, name) => {
+                if (!name.toLowerCase().includes('set-cookie')) {
+                    allHeaders[name] = value
+                }
+            })
+            log.trace('all response headers', allHeaders)
+        }
+
+        return response
+    }
+}
+
+/** Reset for testing. */
+export function resetLogger(): void {
+    logger = null
+}

src/lib/skills/content.ts

@@ -45,6 +45,7 @@ Most list commands also support:
 
 - \`--no-spinner\` - Disable loading animations
 - \`--progress-jsonl\` - Machine-readable progress events (JSONL to stderr)
+- \`-v, --verbose\` - Verbose output to stderr (repeat: -v info, -vv detail, -vvv debug, -vvvv trace)
 
 ## Task References
 

src/lib/spinner.ts

@@ -59,7 +59,14 @@ class LoadingSpinner {
 
         // Check process arguments for flags that should disable spinner
         const args = process.argv
-        const spinnerDisablingFlags = ['--json', '--ndjson', '--no-spinner', '--progress-jsonl']
+        const spinnerDisablingFlags = [
+            '--json',
+            '--ndjson',
+            '--no-spinner',
+            '--progress-jsonl',
+            '--verbose',
+            '-v',
+        ]
 
         // Check for both exact matches and prefix matches (to handle --flag=value variants)
         return spinnerDisablingFlags.some(