cameronrye/activitypub-mcp

v2.2.0 Feature

This release adds 2 notable features for engineering teams evaluating rollout.

Published 5d MCP Data & Storage

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✓ No known CVEs patched

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✓ No known CVEs patched in this version

Topics

activitypub fedify fediverse mcp mcp-server webfinger

Affected surfaces

auth breaking_upgrade

Summary

AI summary

Platform‑aware write layer adds Misskey/Foundkey core support and normalizes API responses.

Changes in this release

Type	Severity	Summary	CVE
Feature
Feature	Medium	Adds platform‑aware write layer routing to correct fediverse API per instance via NodeInfo detection. Adds platform‑aware write layer routing to correct fediverse API per instance via NodeInfo detection. Source: llm_adapter@2026-05-30 Confidence: high	—
Feature	Medium	Adds `UnsupportedOnPlatformError` for bookmarks, poll voting, and scheduled posts on Misskey. Adds `UnsupportedOnPlatformError` for bookmarks, poll voting, and scheduled posts on Misskey. Source: llm_adapter@2026-05-30 Confidence: high	—
Feature	Low	Introduces Misskey/Foundkey adapter for core‑parity write ops normalized to Mastodon types. Introduces Misskey/Foundkey adapter for core‑parity write ops normalized to Mastodon types. Source: granite4.1:30b@2026-05-30-audit Confidence: low	—
Refactor	Low	Introduces `src/auth/adapters/` module with `WriteAdapter` interface, guarded `authenticatedFetch`, and adapter implementations. Introduces `src/auth/adapters/` module with `WriteAdapter` interface, guarded `authenticatedFetch`, and adapter implementations. Source: llm_adapter@2026-05-30 Confidence: high	—

Full changelog

[2.2.0] - 2026-05-29

Added

Platform-aware write layer. Authenticated operations now route to the
correct fediverse API per instance via NodeInfo software detection. A new
Misskey/Foundkey adapter covers core-parity ops (post/reply, renote, reaction,
follow/unfollow, mute/block, account verify, media upload, home timeline,
notifications), normalizing responses into the existing Mastodon-shaped types.
Mastodon-API-compatible software (Pleroma, Akkoma, GotoSocial, Sharkey,
Firefish) and undetected instances continue to use the Mastodon adapter.
UnsupportedOnPlatformError. Bookmarks, poll voting, and scheduled posts —
which have no Misskey equivalent — now return a clear "not supported on
Misskey" error instead of an opaque HTTP failure.

Internal

New src/auth/adapters/ module: WriteAdapter interface + shared guarded
authenticatedFetch, MastodonWriteAdapter (existing logic), and
MisskeyWriteAdapter. AuthenticatedClient is now a thin router resolving the
adapter from detected software; account-manager.verifyAccount routes through
the adapter so Misskey accounts verify against /api/i.

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About cameronrye/activitypub-mcp

A comprehensive MCP server that enables LLMs to explore and interact with the Fediverse through ActivityPub protocol. Features WebFinger discovery, timeline fetching, instance exploration, and cross-platform support for Mastodon, Pleroma, Misskey, and other ActivityPub servers.

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Related context

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Earlier breaking changes

v2.1.0 `activitypub://instance-info/{domain}` `software` field now an object instead of a string.
v2.1.0 Removed `activitypub://post-thread/{postUrl}` URI form; use `{domain}/{statusId}` instead.
v2.0.0 'get-relationship' no longer accepts legacy `accountIds` array; requires single `acct` string.
v2.0.0 `MCP_HTTP_CORS_ORIGINS` no longer defaults to '*'; must be set explicitly.
v2.0.0 `scheduledId` renamed to `scheduledPostId` in scheduling tools.