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MCP server providing comprehensive string utility tools with support for paid and testnet endpoints
String Utils MCP exposes 21 simple utility tools via HTTP. All tools have basic descriptions (10-50 chars) and input schemas with type definitions. However, descriptions are uniformly terse and lack context for LLM selection. No output schemas are documented. Parameter descriptions are minimal (e.g., 'The string to reverse'). No error handling guidance, no examples of when to use each tool, and no indication of what each tool returns. Tool names follow verb_noun convention (reverse_string, snake_to_camel) which is good, but descriptions do not explain WHEN to use each tool or WHAT it returns. This is a functional but minimal implementation typical of utility tool collections.
convert camelcase to snake_case
capitalize each word in string
capitalize first letter of string
check if string contains substring
count occurrences of substring
check if string ends with suffix
check if string is a palindrome
Descriptions are uniformly terse (10-50 chars) and lack context. 'reverse string' and 'convert string to uppercase' do not explain WHEN to use each tool or WHAT it returns. LLMs cannot distinguish between similar tools or plan multi-step operations.
No output schemas documented. Tools return results but LLMs have no way to know what fields to expect. This breaks downstream tool chaining and forces agents to guess at response structure.
| Scored | Grade | Overall | Spec posture | Rubric |
|---|---|---|---|---|
| 2026-09-23 | D | 53 | 2026-07-28+ | v2 |
get string length
normalize whitespace in string
remove non-alphanumeric characters
repeat string n times
replace all occurrences in string
reverse string
convert string to url-friendly slug
convert snake_case to camelcase
check if string starts with prefix
extract substring from string
convert string to lowercase
convert string to uppercase
trim whitespace from string
truncate string to maximum length
No error handling guidance. Tools do not document what happens on invalid input (e.g., negative maxLength in truncate, non-numeric times in repeat). LLMs cannot self-correct or retry intelligently.
Parameter descriptions are minimal. 'The string to reverse' and 'The substring to search for' lack constraints, formats, or examples. LLMs cannot validate inputs before calling.
No tool annotations (readOnlyHint, destructiveHint, idempotentHint). All tools are read-only and idempotent, but this is not declared. Agents cannot optimize execution or understand safety properties.