Circleback vs Nylas Notetaker API

Circleback 61

OAuth with dynamic client registration and two scopes on MCP, and API keys that are read-only or read and write, shown once (28 of 30). Read-only keys and a read-only MCP scope, and only an owner can delete a meeting. No confirmation step on the API for shares or deletes (14 of 20). Transcripts, notes and emails are participant-written text, and no prompt-injection guidance was found (0). A usage dashboard for workspace admins and meeting access requests, with no audit log of API or MCP calls found (4 of 15). SOC 2 Type II, EU-U.S. Data Privacy Framework certification, HIPAA, an external penetration test report on the security portal and a valid security.txt. No bug bounty found (15 of 20). 28+14+0+4+15 = 61.

Nylas Notetaker API 78

Nylas IAM keys, launched 6 October 2026, bind a caller to one grant, workspace, application or organisation with roles and permissions, and can expire. The IAM guide (last updated 9 October) shows principals and credentials can also be created, rotated and revoked through a public /v3/iam API once a first management key is made in the Dashboard, as read for nylas-email. Application keys still reach every grant, and the IAM pages we read don't list Notetaker permissions by name. Keys travel in the Authorization header only. 1 is held back for the application key, as for nylas-email, and 1 because no Notetaker permission is named (28). IAM allows least-privilege callers, but delete is a hard delete with no confirmation step, and the MCP server's confirmation covers email sends only (12). The docs tell developers to treat email and calendar content as untrusted. No guidance names transcripts or meeting chat (8). IAM Access Activity records allowed and denied requests for 400 days, Config Changes records IAM edits, and each Notetaker has a history endpoint (13). The security page lists SOC 2 Type II, ISO 27001, ISO 27701, HIPAA and CSA STAR, a vulnerability disclosure programme, a private bug bounty and annual penetration tests. developer.nylas.com serves an RFC 9116 security.txt with security@nylas.com, valid to 1 August 2027, while www.nylas.com returns 404. That is the evidence nylas-email's 17 rests on, so the line matches it (17). 28+12+8+13+17 = 78.

Circleback 30

No x402, MPP or L402 (0). Seat prices are public, $15 and $25 a user a month, with nothing priced per call (10). The Free plan includes API, MCP and CLI access with 30 days of history and costs nothing. A card isn't mentioned for it (20). A person signs up in a browser and creates a key or approves OAuth (0). 0+10+20+0 = 30.

Nylas Notetaker API 40

No x402, MPP or L402 was found in llms.txt, the OpenAPI file or the pricing page (0). Prices per additional bot hour are public, at $0.80 on Essentials, $0.70 on Pro monthly and $0.65 on Pro annual (20). The Free plan includes 5 bot hours a month and the pricing page says no credit card is required (20). A person creates the account in the Dashboard or through the CLI wizard, which signs in with Google, Microsoft or GitHub (0).

Circleback 81

Each reference page embeds the OpenAPI 3.2 operation for its endpoint, but no single spec file is linked, and MCP input schemas need a sign-in (20 of 25). llms.txt and a Markdown copy of each docs page (10). Operation descriptions state what is returned and who may act, such as only the owner deleting a meeting, and the update call explains replace semantics (16 of 20). Typed parameters with enums and defaults, such as ownership All, Mine or Shared (13 of 15). curl examples, a JSON error envelope with error and code, and 400 and 429 responses per operation (12 of 15). Paths carry no version, and a public releases page dates each entry (10 of 15). 20+10+16+13+12+10 = 81.

Nylas Notetaker API 89

A public OpenAPI 3.1 file covers 244 operations on 140 paths, 23 of them for Notetaker (25). llms.txt, llms-full.txt and a Markdown twin of every page are served (10). Operation descriptions say what each call does and when it applies, such as cancel before joining, leave while attending and delete in any state (16). Notetaker schemas use enums for state, recording type and ordering, ranges for retention and silence timeout, and one required field, with no untyped objects found (13). Each operation documents its 400, 401, 404, 409, 410 and 429 responses, and the media endpoints now a 207 for partial results, with examples and code samples in five languages. The error type is a plain string and the error table lists no Notetaker-specific types (12). The path is versioned as v3 and a dated changelog with an Atom feed tags Notetaker entries. No dated versions within v3 were found (13).

Circleback 70

Closed service with clear terms, effective 7 April 2026, naming Circleback AI, Inc. under Delaware law (15 of 30). The security page says customer data isn't used to train models, retention settings are documented per data type with permanent deletion, the Terms delete data when an account is deleted, and a DPA and BAA are published. The Privacy Policy dates from 15 July 2024 and gives no periods (22 of 30). No deprecation policy or dated deprecation notice found (0 of 20). US processing under the Data Privacy Framework is stated. Sub-processors weren't found outside the DPA, which wasn't read in full (10 of 20). 15+22+0+10 = 47.

Nylas Notetaker API 77

Closed service with Terms of Use naming Nylas, Inc., and MIT SDKs and CLI. The terms describe email, calendar and contacts and do not mention Notetaker (15). The docs state a 14-day default media retention, a 5-minute to 30-day range and permanent deletion, and the Privacy Policy defers to the API docs for end-user data. The policy does not mention meeting recordings, the DPA is available only through sales, and the security page says Nylas does not sell personal information while the policy says website activity data was sold and shared for advertising in the prior 12 months (19). Legacy Notetaker fields are marked deprecated with a migration page and no removal date. No written deprecation policy was found, and the terms allow Nylas to change or end any part of the Services without notice (6). The sub-processor list gives data, purpose and locations and is dated 28 August 2026, with changes announced on the status page. Oxylabs appears as a status-page dependency but not on that list (18).

Circleback 72

28 MCP tools (15 for 11 to 30), plus 5 for the read-only scope that leaves write tools failing. The API lists return pages with filters (20 of 25). Cursor pagination through a Link header and filters by attendee, tag, folder, ownership and status (20). Errors carry a message and a code such as RATE_LIMITED (16 of 20). No idempotency key, and MCP annotations couldn't be read without a sign-in. Read-only keys and scope keep writes off (8 of 20). Few required parameters. The only official client is the Node CLI, with --json output (8 of 15). 20+20+16+8+8 = 72.

Nylas Notetaker API 77

Media comes back as download links, select trims responses to named top-level fields, and limit caps list size (20). List calls page by cursor with next_cursor and page_token, 50 by default and 200 at most, with filters by state and join time and three sort fields (20). Errors carry type, message and request_id, join failures name a reason such as bad_meeting_link or entry_denied, and the media endpoint separates 404 for processing from 410 for deleted (17). Invites accept no idempotency key and every request schedules a new bot. Deduplication covers only Notetakers with a future join_time, and the media endpoint is documented as idempotent (6). An invite needs only meeting_link, and SDKs exist for Node.js, Python, Ruby and Kotlin/Java. The quickstart's SDK samples still use the deprecated name and meeting_settings fields (14).