Claude Code Telemetry

Comprehensive SQL Server telemetry for Claude Code sessions. Track every interaction, tool usage, timing, thinking blocks, subagent executions, and full conversation history.

What Gets Tracked

Data	Hook	Table
Your prompts	UserPromptSubmit	UserPrompts
Tool calls & parameters	PreToolUse	ToolInvocations, ToolParameters
Tool results & timing	PostToolUse	ToolInvocations (ToolResult, DurationMs)
Session metadata	SessionStart	Sessions (Model, GitBranch, GitCommit)
Subagent completions	SubagentStop	SubagentEvents
Context summarization	PreCompact	CompactEvents
System notifications	Notification	NotificationEvents
Full conversations	PostToolUse, UserPromptSubmit, Stop	Messages (incremental + final)
Thinking blocks	PostToolUse, UserPromptSubmit, Stop	Messages.ThinkingContent
Token usage	PostToolUse, UserPromptSubmit, Stop	TokenUsage
Cost estimates	PostToolUse, UserPromptSubmit, Stop	TokenUsage.EstimatedCostUsd
Git file changes	Stop	GitChanges
Raw hook payloads	All	HookEvents.RawJson
Working directory	All	HookEvents.Cwd
Permission mode	All	HookEvents.PermissionMode
Claude session ID	All	HookEvents.ClaudeSessionId
Transcript path	All	HookEvents.TranscriptPath

Requirements

• Python 3.8+
• SQL Server (local or remote)
• ODBC Driver 17 for SQL Server
• pyodbc

Installation

1. Install Python Dependencies

pip install pyodbc

2. Create Database

Run the migration script against your SQL Server:

sqlcmd -S localhost -E -i migrations/001_initial_schema.sql

Or in SSMS, open and execute migrations/001_initial_schema.sql.

3. Configure Connection

Set environment variable for your connection string:

# Windows
set CLAUDE_TELEMETRY_CONNECTION="Driver={ODBC Driver 17 for SQL Server};Server=localhost;Database=ClaudeConversations;Trusted_Connection=yes;"

# Linux/Mac
export CLAUDE_TELEMETRY_CONNECTION="Driver={ODBC Driver 17 for SQL Server};Server=localhost;Database=ClaudeConversations;Trusted_Connection=yes;"

Or edit hooks/db_logger.py directly to set your connection string.

4. Install Plugin

From GitHub (RedJay Marketplace):

/plugin marketplace add JoshuaRamirez/claude-code-telemetry

Then install "claude-code-telemetry" from the RedJay marketplace in /plugin Discover tab.

For local development:

claude --plugin-dir C:\Source\claude-code-telemetry

Schema

Sessions (1) ─────┬───── (*) HookEvents ─────┬───── (*) ToolInvocations ───── (*) ToolParameters
                  │                          ├───── (*) UserPrompts
                  │                          ├───── (*) StopEvents
                  │                          ├───── (*) SubagentEvents
                  │                          ├───── (*) CompactEvents
                  │                          └───── (*) NotificationEvents
                  │
                  └───── (*) Messages

Useful Queries

Session Overview

SELECT
    s.SessionId,
    s.StartedAt,
    s.EndedAt,
    s.Model,
    s.GitBranch,
    s.WorkingDirectory,
    (SELECT COUNT(*) FROM HookEvents WHERE SessionId = s.SessionId) AS EventCount,
    (SELECT COUNT(*) FROM Messages WHERE SessionId = s.SessionId) AS MessageCount
FROM Sessions s
ORDER BY s.StartedAt DESC;

Tool Usage Stats

SELECT
    ToolName,
    COUNT(*) AS Uses,
    AVG(DurationMs) AS AvgMs,
    MAX(DurationMs) AS MaxMs,
    SUM(LEN(ToolResult)) / 1024 AS ResultKB
FROM ToolInvocations
WHERE DurationMs IS NOT NULL
GROUP BY ToolName
ORDER BY Uses DESC;

Recent Prompts

SELECT TOP 20
    s.StartedAt,
    LEFT(up.PromptText, 200) AS Prompt
FROM UserPrompts up
JOIN HookEvents he ON up.EventId = he.EventId
JOIN Sessions s ON he.SessionId = s.SessionId
ORDER BY he.EventId DESC;

Thinking Block Analysis

SELECT
    m.Role,
    LEFT(m.Content, 100) AS ContentPreview,
    LEFT(m.ThinkingContent, 200) AS ThinkingPreview,
    LEN(m.ThinkingContent) AS ThinkingLength
FROM Messages m
WHERE m.ThinkingContent IS NOT NULL
ORDER BY m.MessageId DESC;

Architecture

Claude Code Session
        │
        ├─► PreToolUse ──────► db_pretooluse.py ──┐
        ├─► PostToolUse ─────► db_posttooluse.py ─┤
        ├─► UserPromptSubmit ► db_userpromptsubmit.py
        ├─► SessionStart ────► db_sessionstart.py ├──► db_logger.py ──► SQL Server
        ├─► SubagentStop ────► db_subagentstop.py ┤
        ├─► PreCompact ──────► db_precompact.py ──┤
        ├─► Notification ────► db_notification.py ┤
        └─► Stop ────────────► db_stop.py ────────┘

Features

• Tool Correlation: PreToolUse and PostToolUse linked via tool_use_id
• Timing: Automatic duration calculation for every tool call
• Concurrent Sessions: Safe handling of multiple Claude instances
• Thinking Capture: Extended thinking blocks stored separately
• Git Context: Branch and commit captured at session start
• Fail-Safe: Errors logged to stderr, never blocks Claude operations

Development

After making changes to the repo, sync to your active hooks:

.\scripts\sync.ps1

Changes take effect immediately - no restart needed.

Migrations

If upgrading from an older version, run any new migration scripts:

sqlcmd -S localhost -E -i migrations/002_add_hookevents_columns.sql

License

MIT