Breakcold vs Nutshell

Breakcold 90

OpenAPI 3.1 contract at docs.breakcold.com/api/openapi.json with 70 operations, each with a description (25). llms.txt and a Markdown copy of each page, plus auth.md and an MCP server card (10). Tool descriptions say how to use them, such as records_create asking for every required field and a stable idempotency key and the send tools saying to send only after the user confirms (17 of 20). 84 enums and 488 required lists, with typed attribute pages for each field type (13 of 15). Every operation documents 400 to 429 responses and the error body is shown, but the spec carries only two examples (10 of 15). /api/v1, and an API changelog with dated entries and migration steps (15). 25 + 10 + 17 + 13 + 10 + 15 = 90.

Nutshell 57

Each of the 114 REST reference pages carries the OpenAPI 3.0 definition of its operation, but whole-spec download is disabled (18 of 25). llms.txt and Markdown for every docs page (10). 78 of 114 operations have a description, and the newer ones state scope and visibility rules (11 of 20). Enums on sort fields and patterns on IDs, but filters and custom fields are open objects and page[limit] is typed as a string on some operations (9 of 15). Schema examples are present, and error responses appear on 9 operations with no error body schema (5 of 15). The spec is version 2.0.0 and pages carry update stamps, with no dated API changelog (4 of 15).

Breakcold 60

API changelog entry on 6 November 2026 (30). More than 60 dated entries since 8 August 2026 (20). Closed service with a public API changelog, an RSS feed, a help centre and support by email; no public issue tracker (10 of 15). The CRM MCP server is not in the official MCP registry (the registry's io.github.breakcold/inboxmcp is a separate product at inbox-mcp.com), and no official SDK exists (0). No package to check (0). 30 + 20 + 10 + 0 + 0 = 60.

Nutshell 36

The MCP server help article, updated 27 October 2026, documents create and update tools that the 8 October reading did not find, a dated change to a listed surface 8 days before the check (30 of 30). The REST reference pages carry update stamps, the newest 21 August 2026, but the stamps record no API change, and the product updates page is undated, so no other dated entry counts. One dated change in the 90 days from 6 August (0). No API changelog. Live support on every plan per the pricing page, untested (6 of 25). No current official SDK, and the MCP registry was not checked (0). No packages to judge (0). 30 + 0 + 6 + 0 + 0 = 36.

Breakcold 67

72 MCP tools (5), with tools_search and capabilities_list to find tools by capability or granted scope, and scopes that limit which tools apply (8 back). Cursor pagination, record search and a fields selection on record lists since 3 November (18 of 20). Errors carry a code, message, requestId and retryAfterMs, and the 4 November changelog removed stack frames from messages (17 of 20). Idempotency keys on creates, and compose and send tools return a non-sending draft by default; MCP annotations are not published (14 of 20). No official SDK; setup is one URL with OAuth (5 of 15). 13 + 18 + 17 + 14 + 5 = 67.

Nutshell 44

The MCP server has about 18 groups of search and report tools and six groups of create and update tools per the help centre, updated 27 October 2026. The tool definitions sit behind OAuth and were not read. REST lists take page[limit] with no field selection (13 of 25). page[page], sort, q and filter[...] keys, with field lists from /accounts/list/fields, and no stated maximum page size (16 of 20). Error responses appear on 9 of 114 operations with no error body schema, partly met (4 of 20). No idempotency keys. Deletes can be undone within 30 days, and the MCP server cannot delete records, partly met (6 of 20). Few required fields, and no official REST SDK. The only client is a PHP JSON-RPC sample last pushed in 2023 (5 of 15).

Breakcold 15

No x402, MPP or L402 (0). Plan prices are public, and each call's cost in usage tokens is published, but the money value of a token is not (10). The 14-day trial needs a card (0). auth.md documents an agent identity endpoint that takes an identity assertion or an anonymous request followed by a claim by a person, which we read and did not call; access still needs a paid or card-backed trial account (5 of 20). 0 + 10 + 0 + 5 = 15.

Nutshell 35

No x402, MPP or L402 (0). Plan prices are public, $13 to $79 a seat a month billed yearly, with nothing per call (10). 14-day trial with no card, and the API is included (20). A person signs up in a browser and an admin creates the key. The docs publish sandbox credentials for a shared demo account, which lets an agent test calls with no signup but not reach its own data (5 of 20).

Breakcold 67

Closed service with a legal centre whose terms name Logike SAS, its registration and French law (15 of 30). The privacy policy of 27 October 2026 and the DPA agree, give retention periods for specific copies (deleted record snapshots 30 days, exports 7 days, import rows 90 days, call recordings 30 to 365 days) and promise breach notice without undue delay (27 of 30). The developer terms tie notice of material breaking changes to the services agreement, and the changelog gives migration steps, with no fixed notice period found (12 of 20). DPA Annex C lists providers and their functions with 30 days' notice of changes; locations are said to depend on configuration, with US and EU app regions (15 of 20). 15 + 27 + 12 + 15 = 69.

Nutshell 72

Closed service with clear terms naming Nutshell, Inc. (15). The terms, privacy policy and DPA, all dated 2 June 2026, agree on a 30-day export window after termination, deletion from production afterwards, backup copies that may persist indefinitely and no training of generalised AI models on customer data (24 of 30). The JSON-RPC API is marked legacy with a promise of indefinite support, but there is no deprecation policy and the terms allow functions to be removed without prior notice (5 of 20). The subprocessor list at trust.nutshell.com could not be read. The policy names AWS and regions, and the DPA promises 10 days' notice of a new subprocessor (12 of 20).