IA-QA — 152 QA & Dev Tools for AI Agents

count_tokens

Read-onlyIdempotent

Estimate the token count of a text string using the cl100k_base approximation (~4 chars/token). Shows whether a text fits the context window of a model and what it costs. Returns token estimate, character count, and word count.

Input Schema

Name	Required	Description	Default
`input`	Yes	Text to count tokens for

Output Schema

Name	Required	Description	Default
`chars`	No
`words`	No
`tokens_estimate`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 31, 2026

addedInput schema / examples

Added value: +[
+  {
+    "input": "Hello world, this is a test."
+  }
+]

Changed1 schema field changedJun 21, 2026

addedOutput schema / properties

Added value: +{
+  "chars": {},
+  "tokens_estimate": {},
+  "words": {}
+}

Changed1 schema field changedJun 10, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "additionalProperties": true,
+  "type": "object"
+}

First observedMay 26, 2026

TDQS

Score is being calculated.

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