naftiko/skills/count-tokens-in-a-message
skills/count-tokens-in-a-message/SKILL.md
# Count Tokens In A Message Count the number of tokens that would be consumed by a message before sending it, enabling informed decisions about message length and token budget management. ## API Details - **API**: Anthropic Messages API - **Method**: POST - **Path**: `/v1/messages/count_tokens` - **Operation ID**: `countTokens` - **OpenAPI**: [anthropic-messages-api-openapi.yml](../../openapi/anthropic-messages-api-openapi.yml) ## Sandbox Mock server URL: `http://localhost:8080/rest/anthrop
$ install --global
skillsauthnpx skillsauth add naftiko/anthropic-sandbox skills/count-tokens-in-a-messageInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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Last scanned: Apr 8, 2026, 2:23 AM9.6s1 file scanned
SKILL.md
Count Tokens In A Message
Count the number of tokens that would be consumed by a message before sending it, enabling informed decisions about message length and token budget management.
API Details
- API: Anthropic Messages API
- Method: POST
- Path:
/v1/messages/count_tokens - Operation ID:
countTokens - OpenAPI: anthropic-messages-api-openapi.yml
Sandbox
Mock server URL: http://localhost:8080/rest/anthropic-models-api/2025-03-05/v1/messages/count_tokens
Required Headers
anthropic-version: 2023-06-01x-api-key: {api-key}Content-Type: application/json
Request Body
{
"model": "claude-sonnet-4-20250514",
"messages": [
{
"role": "user",
"content": "Hello, how are you?"
}
]
}
| Field | Type | Required | Description |
|-------|------|----------|-------------|
| model | string | Yes | The Claude model to use for token counting |
| messages | array | Yes | Messages to count tokens for |
| system | string/array | No | System prompt to include in count |
| tools | array | No | Tool definitions to include in count |
| thinking | object | No | Thinking configuration to include in count |
Example Request
curl -X POST "http://localhost:8080/rest/anthropic-models-api/2025-03-05/v1/messages/count_tokens" \
-H "anthropic-version: 2023-06-01" \
-H "x-api-key: your-api-key" \
-H "Content-Type: application/json" \
-d '{"model": "claude-sonnet-4-20250514", "messages": [{"role": "user", "content": "Hello, how are you?"}]}'
Example Response
{
"input_tokens": 2095
}
Instructions
When the user asks to count tokens in a message or wants to know the token cost before sending, use this operation by making a POST request to /v1/messages/count_tokens with the same parameters you would use for a message creation request (without actually sending it).
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