ActivityPub MCP Server
A comprehensive MCP server that enables LLMs like Claude to explore and interact with the existing Fediverse through standardized MCP tools, resources, and prompts.
Caution. Specific findings reduced this grade. They are listed on the page. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.
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cameronrye
Source: Glama
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Install from
The grade above is for the source repository. Registries can serve a different version, so we mark the ones we were not able to read.
Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.
When Vitest UI server is listening, arbitrary file can be read and executed
@modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse
Anthropic's MCP TypeScript SDK has a ReDoS vulnerability
Model Context Protocol (MCP) TypeScript SDK does not enable DNS rebinding protection by default
ACTIVITYPUB_ACCOUNTSACTIVITYPUB_CONFIG_DIRACTIVITYPUB_DEFAULT_INSTANCEAlternatively, set and ACTIVITYPUB_DEFAULT_TOKEN env vars for a single account without the CLI flow.ACTIVITYPUB_DEFAULT_TOKENAlternatively, set ACTIVITYPUB_DEFAULT_INSTANCE and env vars for a single account without the CLI flow.ACTIVITYPUB_DEFAULT_USERNAMEACTIVITYPUB_ENABLE_WRITES"": "true"AP_MCP_ACTIONAP_MCP_CONFIG_PATHAP_MCP_PACKAGE_NAMEAP_MCP_SERVER_NAMEAUDIT_LOG_ENABLEDAUDIT_LOG_MAX_ENTRIESBLOCKED_INSTANCESCACHE_MAX_SIZECACHE_TTLDYNAMIC_INSTANCE_CACHE_TTLINSTANCES_SOCIAL_TOKENINSTANCE_BLOCKING_ENABLEDLOG_LEVELMAX_DYNAMIC_INSTANCESMAX_RESPONSE_SIZEMAX_RETRIESMAX_UPLOAD_SIZEMCP_HTTP_ALLOWED_HOSTSMCP_HTTP_ALLOWED_ORIGINSMCP_HTTP_CORS_ENABLEDMCP_HTTP_CORS_ORIGINSMCP_HTTP_HOSTMCP_HTTP_PORTMCP_HTTP_SECRETMCP_INSTANCE_SOFTWARE_TTL_MSMCP_SERVER_NAMEMCP_SERVER_VERSIONMCP_THREAD_CROSS_ORIGIN_FETCHMCP_THREAD_MAX_DEPTHMCP_THREAD_MAX_REPLIESMCP_TRANSPORT_MODERATE_LIMIT_CLEANUP_INTERVALRATE_LIMIT_ENABLEDRATE_LIMIT_MAXRATE_LIMIT_WINDOWREQUEST_TIMEOUTRETRY_BASE_DELAYRETRY_MAX_DELAYRUN_INTEGRATION_TESTSXDG_CONFIG_HOMEAll four hints declared on every tool
37/37 tools missing one or more hints — list-accounts (missing: destructiveHint, idempotentHint, openWorldHint); switch-account (missing: destructiveHint, idempotentHint, openWorldHint); verify-account (missing: destructiveHint, idempotentHint, openWorldHint), +34 more. OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.
For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.
Tool inputs are validated
22/25 tool handlers declare input schemas (88%)
Declare an inputSchema with zod/joi/yup on every tool definition.
Tool handlers catch errors
23/25 tool handlers wrap calls in try/catch (92%)
Wrap each tool handler body in try/catch and return a structured error response.
Tool test coverage
Only 7/37 tools referenced in tests (19%)
Write tests that reference each tool by name so every tool has at least one test.
Shell command execution
4 child_process calls — runs shell commands
Prefer library functions over shell-outs. If you must shell out, ensure all inputs are properly escaped.
Production dependencies are patched
0 critical, 3 high severity in production deps — @modelcontextprotocol/sdk@1.18.1 (high), @modelcontextprotocol/sdk@1.18.1 (high)
Run npm audit fix, or upgrade the affected packages to a non-vulnerable version.
Dev dependencies
1 critical/high in dev-only deps (does not ship to users)
Upgrade dev dependencies when convenient.
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