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Validate protocol_version value

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## Motivation and Context

Currently, MCP supports the following three protocol versions:
"2025-06-18", "2025-03-26", and "2024-11-05".
https://modelcontextprotocol.io/introduction

As shown in the changes to `test/mcp/configuration_test.rb`,
the `protocol_version` value is not currently being validated,
which allows unexpected `protocol_version` values to be accepted.

This PR ensures that only supported protocol versions are accepted.

## How Has This Been Tested?

Existing tests have been updated and new tests have been added.

## Breaking Changes

None. If it becomes an issue, it means a value that was not originally intended has been used.

## Additional context

While one possible approach might be to fall back to a default protocol version
when an invalid `protocol_version` value is provided,
this PR opts to reject invalid `protocol_version` values explicitly.
The reasoning is that encouraging users to provide intentional,
valid input is preferable to silently falling back to a default,
which could lead to unexpected behavior.
This commit is contained in:
Koichi ITO 2025-07-16 01:12:52 +09:00
commit f13522d416
1 changed files with 22 additions and 7 deletions
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README.md
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@ -338,6 +338,8 @@ This will make all new server instances use the specified protocol version inste
MCP::Server.protocol_version = nil
```
If an invalid `protocol_version` value is set, an `ArgumentError` is raised.
Be sure to check the [MCP spec](https://modelcontextprotocol.io/specification/2025-03-26) for the protocol version to understand the supported features for the version being set.
### Exception Reporting