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Side-by-side MCP evidence comparison
Evidence fieldKlaviyoWatchlist candidateNotion MCPMCP100 Selected
Task fit
Best for
  • Klaviyo teams that need analytics/marketing workflows in an AI client and can use read-only/user-content restrictions where appropriate.
  • Reading and updating explicitly shared Notion pages
  • Markdown-oriented page workflows
  • Teams able to create a dedicated least-privilege integration
Not ideal for
  • Teams handling sensitive marketing/customer data without clear API scopes or prompt-injection controls.
  • Whole-workspace access without page scoping
  • Stable local-server APIs with no migration monitoring
  • Workflows that only need occasional manual Notion lookup
Avoid when
  • For exploratory use, prefer `read-only=true` and disable tools that expose user-generated content unless those features are specifically needed.
  • Sensitive workspace content cannot be exposed to the connected model/client
  • You cannot create a dedicated read-only integration or restrict page access
  • You depend on removed pre-2.0 database tool names
Provenance
Provenance details

First-party MCP

endpoint:https: · Publisher source ↗

First-party MCP

Notion · Publisher source ↗

Maintenance
Maintenance details

Stale

Repo: Not documented

Package: Not documented

Repo: Jul 25, 2026

Package: Jul 25, 2026

Popularity evidence
GitHub starsNot documented

4,594

GitHub stars · checked 2026-08-14T18:46:26.000Z

Package downloads / 30 daysNo reliable download data

624,402

package downloads / 30 days · checked 2026-07-29T17:30:00.000Z

Client coverage
Client coverage detailsNot documented
Claude Code✓ Streamable HTTP
Claude Desktop✓ Streamable HTTP
Codex✓ Streamable HTTP
VS Code✓ Streamable HTTP
Cursor✓ Streamable HTTP
OpenCode✓ Streamable HTTP
Client coverage noteLocal stdio runs on your computer. Streamable HTTP connects to a remotely hosted MCP server.
Access and data
AuthenticationHosted service uses OAuth/dynamic client registration; local server can use a scoped Klaviyo private API key.The supported hosted service uses OAuth. The documented local server uses NOTION_TOKEN or OPENAPI_MCP_HEADERS; HTTP transport has a separate bearer token and supports carefully configured per-request Notion token passthrough.
CostKlaviyo plan/API and model/provider costs apply.The local server is MIT licensed. A Notion account and workspace plan are required, and Notion plan/API limits apply; hosted MCP-specific charges were not established in the reviewed materials.
PermissionsPermissions follow OAuth/API scopes. Hosted read-only mode disables write tools; UGC-related tools can also be disabled.Local access is limited by the Notion integration capabilities and pages connected to that integration. Read-only capability is available; write-capable tools can create or update workspace content. Local HTTP transport requires bearer authentication unless an explicitly unsafe flag disables it.
Data handlingMarketing/customer/account data and potentially user-generated content can be exposed to the AI client/provider. Klaviyo explicitly provides a control to disable UGC tools.Page/database content accessible to the integration can be returned to the MCP client and model. The local server calls Notion APIs; hosted Notion MCP additionally processes requests through Notion's remote service.
Limitations
Tradeoffs
  • Promoted after strict re-audit: canonical identity and MCP-native/publisher-backed implementation are sufficiently evidenced, with real workflow value, usable documentation, understandable permissions, plausible maintenance, and no unresolved security veto. Still not strong enough for Selected.
  • Hosted OAuth is actively supported and easier; the local repository warns it may be sunset.
  • Write capability enables useful edits but raises deletion, overwrite, and prompt-injection risk.
  • Version 2 changed database operations to data-source tools, requiring updates to hardcoded prompts.
Risk contextSensitive customer/marketing data, mutating campaign operations and prompt-injection risk from user-generated content require explicit controls.Workspace content may be read or modified within the integration's reach. Use a dedicated integration, Read content only where possible, explicitly connect only needed pages, avoid unsafe HTTP auth disabling, and monitor hosted/local migration guidance.
Evidence date
Editorial review2026-09-13T00:00:00Z2026-07-24
Candidate evidence2026-09-13T00:00:00Z2026-08-14T18:46:26.000Z

Popularity, maintenance, fit, permissions, and client support are independent evidence fields.

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