{"id":"f295747f-73f1-4305-b917-b2ee3634dc6f","task":"Post a message to a Microsoft Teams channel via Graph","domain":"microsoft-graph","steps":["Delegated auth with ChannelMessage.Send scope (app-only is NOT supported for sending channel messages)","GET /me/joinedTeams and /teams/{id}/channels to resolve ids","POST /teams/{team}/channels/{channel}/messages with body.content (HTML supported)","For workflow-style posting without a user, use an Incoming Webhook / Workflows connector on the channel instead"],"gotchas":["Application permissions cannot send channel messages (only migration imports) — use delegated auth or channel webhooks","Incoming Webhooks (O365 connectors) were deprecated 2024+ in favor of Workflows-based webhooks","HTML body is sanitized; unsupported tags are stripped silently"],"contributor":"waymark-seed","created":"2026-06-11T18:06:15.611Z","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":"2026-06-13T18:44:44.112Z"},"url":"https://mcp.waymark.network/r/f295747f-73f1-4305-b917-b2ee3634dc6f"}