Vonage Messages API + MCP vs YCloud

Vonage Messages API + MCP 73

Sends can be authorised with an application JWT signed RS256, whose ACL claim limits paths and methods and whose lifetime runs from 30 seconds to 24 hours, or with Basic auth on the account key and secret (30). JWT ACLs can narrow a token, with no confirmation step for sends (15 of 20). Inbound messages are untrusted text. Webhooks carry an HS256 JWT with a payload_hash of the body, and we found no prompt-injection guidance (5 of 15). Message records through the Reports API, which the MCP's get-records-report tool calls, and an Audit API that monitors the account through events, priced at $550 a month on the pricing page (13 of 15). Per the 2 October check (www.vonage.com answered a bot check on 1 November), the security page says Vonage holds ISO 27001, PCI-DSS, SOC, HITRUST and CSA STAR across its product lines without saying which cover the Communications APIs, and links a CSA STAR registry entry. www.vonage.com/.well-known/security.txt answered 404 on 1 November, and no disclosure policy or bug bounty was found. OSV lists no advisory for @vonage/server-sdk, vonage, @vonage/messages or the MCP package (10 of 20).

YCloud 31

One API key in the X-API-Key header, never in the URL, rotated by creating a new key and revoking the old one; no scopes found (20 of 30). Trial accounts send only to pre-verified numbers; no read-only key or approval step (4 of 20). Inbound WhatsApp and SMS text arrives through webhooks, with no prompt-injection guidance (0 of 15). Every response carries a request ID; no operator request log was found in the docs (5 of 15). No certification is named on the pages read, the about page shows an unlabelled ISO image, and there is no security.txt or disclosure policy (2 of 20). 20 + 4 + 0 + 5 + 2 = 31.

Vonage Messages API + MCP 50

The Messages API sends and updates messages and returns a message_uuid. Lists and searches live in the separate Reports API (15 of 25). Filtering only through Reports (10 of 20). A shared error catalogue with codes an agent can look up (15 of 20). No idempotency key on sends, and channel-level rejections arrive later by status webhook after a 202 (0 of 20). SDKs in Node, Python and four more languages. Basic auth works for sends, but application webhooks need a JWT application (10 of 15).

YCloud 83

List endpoints use a documented pagination guide with limits; send responses are small (18 of 25). Pagination and filters (18 of 20). Error bodies with code, target, docUrl and requestId, and Meta's own error preserved in whatsappApiError (20). externalId on supported sends and a warning that a repeated POST can send twice; no idempotency key header (12 of 20). A send needs a recipient and content; official SDKs for Node.js, Java, Go and PHP (15). 18 + 18 + 20 + 12 + 15 = 83.

Vonage Messages API + MCP 80

vonage-python-sdk v4.9.1 tagged on 2026-10-21, fixing the SMS text length limit in the Messages package (30). In the 90 days from 3 August, vonage-node-sdk v3.30.0 (1 September) and v3.30.1 (8 September, a version bump only, counted half) and vonage-python-sdk v4.9.0 (16 September) and v4.9.1 (21 October), 3.5 in all. The developer changelog index carries only Video entries (20). Closed service with a changelog index and a support site. We didn't sample issue replies (8 of 15). Official SDKs current in six languages (15). The MCP repo runs CI, which since 21 October fails on test errors, but its last release is still v1.5.1 on 2026-05-26, with nine commits since then unreleased on 1 November (7 of 10). 30 + 20 + 8 + 15 + 7 = 80.

YCloud 74

@ycloud-cpaas/ycloud-sdk-node 1.17.2 on 3 November 2026 (30). Releases 1.17.0 (23 October), 1.17.1 (26 October) and 1.17.2 in the window (20). Closed service with a ticket desk; GitHub issue replies weren't sampled (6 of 15). Current official SDKs in four languages, generated from the spec; no MCP server in the docs or registry (15). The Node SDK repository has no CI workflow in the clone we read (3 of 10). 30 + 20 + 6 + 15 + 3 = 74.