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MCP Adapter · Version history

MCP Adapter changelog and version history

Latest version
0.7.1
Oct 16, 2026 (24 days ago)
Releases
2
since 2026
In the last year
2
about one every 14 days
Tested up to
WordPress 7.1.4
PHP 7.4 or later

20262 releases

  1. MCP Adapter 0.7.1Latest

    • Fixed
    • Bound stored session initialization parameters to 4 KiB and automatically recover oversized session data, preventing repeated database failures and excessive logging. Affected clients need to reconnect once. Client icons are excluded from storage so large inline icons do not prevent connections.
    • Register the installed plugin’s autoloader before checking for bundled copies, allowing version selection before an older bundled class is loaded.
    • Unknown ability names from MCP clients no longer generate WordPress developer notices.
    • Changed
    • Unavailable abilities return clearer errors with relevant available ability names or a pointer to discovery. Abilities not exposed through MCP return the same ability_not_found error as unknown names.
    • Added
    • A site-owner guide covers connecting an AI client, Application Passwords, and troubleshooting.

  2. MCP Adapter 0.7.0

    • Breaking Changes
    • The adapter serves exactly two MCP schema revisions, 2025-11-25 and 2026-07-28. Clients that propose 2025-06-18 or 2024-11-05 still connect and are served through the 2025-11-25 schema.
    • The generated DTO classes, the McpToolValidator, McpResourceValidator, and McpPromptValidator classes, and the mcp_adapter_validation_enabled filter have been removed. Wire validation always runs through the selected schema.
    • Invalid protocol fields are no longer silently dropped or repaired. Components that no supported revision can represent are rejected.
    • Custom transports must delegate to HttpRequestHandler or McpWireOrchestrator. JSON-RPC batch requests are rejected.
    • WP\MCP\Cli classes are final.
    • Added
    • MCP 2026-07-28 support, including the sessionless server/discover lifecycle and the new HTTP headers.
    • Direct callable tools can request elicitation input under 2026-07-28 by returning McpInputRequired.
    • McpRequestContext, an immutable per-request context with the selected schema, transport, and session data.
    • Changed
    • Using MCP Adapter as a bundled library is deprecated. Install the MCP Adapter plugin instead.
    • Fixed
    • mcp-adapter/get-ability-info serializes an empty input_schema as {} instead of [].
    • Default abilities register when another plugin initializes the Abilities API before the MCP server initializes.
    • See the 0.7.0 migration guide and CHANGELOG.md for the full list of changes.

Questions about MCP Adapter’s releases

What is the latest version of MCP Adapter?

0.7.1, released on Oct 16, 2026 (3 weeks ago). It’s tested up to WordPress 7.1.4 and needs PHP 7.4 or later.

How often is MCP Adapter updated?

2 releases in the last year, about one every 14 days. Its first release on WordPress.org dates from October 2026.

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Release dates come from the day each version’s folder was made in MCP Adapter’s WordPress.org SVN repository; the notes from its readme’s changelog, as its authors wrote it.