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Readme

CostHawk MCP Server

Official MCP server for CostHawk - AI API cost monitoring and optimization platform.

Early Alpha - CostHawk is currently in early alpha testing. Join the waitlist to get early access.

Overview

CostHawk helps teams track, analyze, and optimize their AI API spending across providers like Anthropic, OpenAI, and Google.

Key Features:

Real-time usage tracking and cost analytics
Claude Code local usage tracking with optional auto-sync (NEW in v1.3.0)
Codex local usage tracking with optional auto-sync (NEW in v1.3.1)
Savings analysis for flat-rate subscriptions (Claude Pro/Max, OpenAI Pro)
Budget alerts and anomaly detection
Webhook notifications (Slack, Discord, PagerDuty)

Quick Install

# Global installation (all projects)
claude mcp add -s user -e COSTHAWK_API_KEY=YOUR_TOKEN_HERE costhawk -- npx -y costhawk@latest

# Project-specific installation
claude mcp add -e COSTHAWK_API_KEY=YOUR_TOKEN_HERE costhawk -- npx -y costhawk@latest

Get your access token from Settings → Developer in your CostHawk dashboard (requires approved account).

Auto-sync is off by default. Enable it by setting COSTHAWK_AUTO_SYNC=true in your MCP configuration.

Quick Verify (Recommended)

Make sure you’re running the latest MCP build before debugging tool lists:

npx -y costhawk@latest --self-test

This prints:

the MCP version
the full tool list (including Codex tools)
basic local checks (Claude/Codex directories, API key presence)

If Claude Code doesn’t show the tools, restart it after installing and re-run:

npx -y costhawk@latest --tools

To see exactly which local directories and sample files are read:

npx -y costhawk@latest --what-we-read

To include the git commit hash in --self-test (and --version), build with:

COSTHAWK_GIT_SHA=$(git rev-parse --short HEAD) npm run build

Available Tools

Usage Tracking

Tool	Description
`costhawk_get_usage_summary`	Get usage and costs over a time period (by provider/model)
`costhawk_get_usage_by_tag`	Get usage grouped by custom tags (user_id, feature, etc.)
`costhawk_detect_anomalies`	Check for cost anomalies and unusual usage patterns

Claude Code Local Tracking (Optional Auto-Sync)

These tools parse your local Claude Code transcripts from ~/.claude/projects/ to track token usage - including the 4 token types Claude Code uses.

Auto-Sync (Opt-in): Set COSTHAWK_AUTO_SYNC=true to automatically sync your Claude Code usage to CostHawk every 15 minutes while running. Requires COSTHAWK_API_KEY.

input_tokens - Regular input
output_tokens - Regular output
cache_creation_input_tokens - Writing to prompt cache
cache_read_input_tokens - Reading from cache (10x cheaper!)

Tool	Description
`costhawk_sync_claude_code_usage`	Sync local usage to CostHawk dashboard for savings analysis
`costhawk_get_local_claude_code_usage`	View local usage offline with cost breakdown
`costhawk_list_claude_code_sessions`	List available Claude Code sessions

Example: Check local usage offline

Use costhawk_get_local_claude_code_usage with subscriptionPlan="max_5x"

This shows your token usage, costs at retail rates, and whether you're saving money vs your subscription.

Codex Local Tracking (Beta)

These tools parse your local Codex session logs from ~/.codex/sessions/ to track token usage by type.

Optional Auto-Sync: Set COSTHAWK_AUTO_SYNC=true to enable auto-sync, and optionally set COSTHAWK_CODEX_AUTO_SYNC=false to disable Codex auto-sync.

Tool	Description
`costhawk_sync_codex_usage`	Sync local Codex usage to CostHawk dashboard
`costhawk_get_local_codex_usage`	View local Codex usage offline with token breakdown
`costhawk_list_codex_sessions`	List available Codex sessions

Savings Analysis

Tool	Description
`costhawk_get_savings`	Compare retail costs vs subscription costs
`costhawk_get_savings_breakdown`	Per-model breakdown of usage and costs
`costhawk_list_subscriptions`	List your active flat-rate subscriptions

Pricing & Alerts

Tool	Description
`costhawk_get_model_pricing`	Get current AI model pricing (input/output per 1M tokens)
`costhawk_list_alerts`	List budget warnings, cost spikes, and anomaly alerts

Webhooks

Tool	Description
`costhawk_list_webhooks`	List configured webhook endpoints
`costhawk_create_webhook`	Create webhook for Slack, Discord, Teams, PagerDuty

Claude Code Token Types Explained

Claude Code uses caching extensively, which significantly affects your costs:

Token Type	Description	Sonnet 4 Pricing
Input	Regular input tokens	$3/1M
Output	Regular output tokens	$15/1M
Cache Write	Writing to prompt cache	$3.75/1M
Cache Read	Reading from cache	$0.30/1M (10x cheaper!)

The cache read savings are significant - CostHawk tracks all 4 types to give you accurate cost calculations.

Environment Variables

Variable	Required	Description
`COSTHAWK_API_KEY`	Yes*	Your CostHawk API token
`COSTHAWK_API_URL`	No	API base URL (defaults to https://costhawk.ai)
`COSTHAWK_DEBUG`	No	Log API requests (set to `true`)
`COSTHAWK_AUTO_SYNC`	No	Enable auto-sync (set to `true`)
`COSTHAWK_CODEX_AUTO_SYNC`	No	Disable Codex auto-sync (set to `false`)

*Required for most tools. Local Claude Code tools work offline without an API key.

CLI Flags

Flag	Description
`--version` / `-v`	Print the MCP server version and exit
`--tools`	Print the registered tool names and exit
`--self-test`	Print version + tool list + local env checks and exit
`--what-we-read`	Print local directories and sample files read by the MCP

Privacy & Trust

CostHawk’s MCP server is designed to be local-first and transparent:

Local parsing only: We read ~/.claude/projects/ and ~/.codex/sessions/ locally to compute usage.
No conversation content sent: Only token totals and metadata are transmitted.
Dry-run mode: Use dryRun=true in costhawk_sync_claude_code_usage or costhawk_sync_codex_usage to preview payloads without uploading.
Payload previews: Use previewLimit to see the first N sessions that would be uploaded.
File list visibility: Use includeFileList=true to see which local files were read.
Auto-sync is opt-in: Enabled only when you set COSTHAWK_AUTO_SYNC=true.
Debug logging: Set COSTHAWK_DEBUG=true to log API requests.

Example dry run (no upload):

Use costhawk_sync_claude_code_usage with dryRun=true includeFileList=true previewLimit=3

Getting Started

Get Early Access: Join the waitlist and wait for approval
Create API Token: Go to Settings → Developer → Create Token
Install MCP Server: Use the quick install command above
Start Tracking: Use the tools in Claude Code or Claude Desktop

Example Workflows

Check if your Claude Max subscription is worth it

1. costhawk_list_claude_code_sessions (see what's available)
2. costhawk_get_local_claude_code_usage with subscriptionPlan="max_5x"
3. Review the savings breakdown

Sync usage to dashboard for team visibility

1. costhawk_sync_claude_code_usage (uploads to CostHawk)
2. View detailed analytics at costhawk.ai/dashboard

Set up cost spike alerts

1. costhawk_create_webhook with type="slack" and events=["cost_spike", "budget_alert"]
2. Get notified when costs exceed thresholds

Changelog

v1.3.5 (February 2026)

Trust & Transparency

New: Dry-run support for Claude + Codex sync tools
New: includeFileList and payload previews for sync tools
New: --what-we-read CLI flag to show local paths and samples
New: COSTHAWK_DEBUG=true to log API requests
New: COSTHAWK_GIT_SHA support for version/diagnostics
Updated: Auto-sync is opt-in (COSTHAWK_AUTO_SYNC=true)

v1.3.2 (February 2026)

CLI Quality-of-Life

New: --version flag for fast version checks
New: --tools flag to list MCP tools without starting the server
New: --self-test flag to show tool list + local environment checks
Updated: Recommend npx -y costhawk@latest to avoid stale global binaries

v1.3.1 (February 2026)

Codex Local Tracking (Beta)

New: costhawk_sync_codex_usage - Sync local Codex session usage to CostHawk
New: costhawk_get_local_codex_usage - View Codex usage offline with token breakdown
New: costhawk_list_codex_sessions - List available local Codex sessions
New: Optional Codex auto-sync (COSTHAWK_CODEX_AUTO_SYNC=true)

v1.2.1 (January 2026)

Auto-Sync - Automatic background syncing

New: Auto-sync Claude Code usage every 15 minutes while MCP server is running
New: Initial sync 30 seconds after server starts
New: Graceful shutdown handling for sync cleanup
Requires COSTHAWK_API_KEY to be configured for auto-sync

v1.2.0 (January 2026)

Claude Code Local Tracking - Major new feature release

New: costhawk_sync_claude_code_usage - Sync local Claude Code transcripts to CostHawk
New: costhawk_get_local_claude_code_usage - View usage offline with cost breakdown
New: costhawk_list_claude_code_sessions - List available local sessions
New: Full support for all 4 Claude Code token types (input, output, cache write, cache read)
New: Offline cost calculation with embedded pricing
New: Savings comparison vs Claude Pro/Max subscriptions

v1.1.x

Savings analysis tools (costhawk_get_savings, costhawk_get_savings_breakdown)
Subscription management (costhawk_list_subscriptions)
Webhook support for Slack, Discord, Teams, PagerDuty
Usage tracking and anomaly detection

v1.0.x

Initial release
Basic usage summary and cost tracking
Model pricing lookup
Alert notifications

License

MIT

costhawk