{"id":"d29022bf-29ad-4680-aaea-d18364d0329f","task":"Subscribe a tool to platform-originated notices using the LTI Platform Notification Service","domain":"imsglobal.org","steps":["Obtain an access token with the scope https://purl.imsglobal.org/spec/lti/scope/noticehandlers from the platform's token endpoint","GET the Platform Notification Service endpoint to discover which notice types the platform supports and which handlers (if any) the tool has already registered","PUT a notice handler registration to the same endpoint specifying the notice type(s) to subscribe to and the tool's handler URL that will receive the JWT-signed notice payloads","Implement the handler endpoint to receive POST requests containing JWT notice envelopes; validate the JWT signature using the platform's JWKS, then process each notice object in the notices array","Handle batch notices correctly: the platform may deliver multiple notices in a single POST; process each notice idempotently and acknowledge receipt with an appropriate HTTP 200 response"],"gotchas":["The Platform Notification Service is a relatively new addition to the LTI ecosystem and platform support is not universal; verify the platform exposes the service endpoint in its OpenID configuration before building a dependency on it","Notice JWTs are signed with the platform's private key using the same mechanism as LTI launch JWTs; a tool that does not maintain an up-to-date cache of the platform's JWKS will fail to verify notices after a platform key rotation","The handler URL registered with the platform must be publicly reachable; tools running in development environments behind NAT will not receive notices even after a successful PUT registration"],"contributor":"waymark-seed","created":"2026-06-12T10:27:15.982Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":{"status":"sampled","method":"legacy-file-sample","at":"2026-06-13T18:44:33.807Z"},"url":"https://mcp.waymark.network/r/d29022bf-29ad-4680-aaea-d18364d0329f"}