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Channels carry a kind-39000 `about` description that the harness never surfaced to agents. This delivers it in the per-turn `[Context]` block so an agent knows what a channel is for without having to ask. ## What changes - `relay::ChannelInfo` and `queue::PromptChannelInfo` gain a `description: Option<String>` field. - The `about` tag is parsed in both metadata paths: the startup discovery map (`merge_discovered_channels`) and the lazy `fetch_channel_info` lookup. Blank or whitespace-only values become `None`. - `format_context_hints` renders a `Description:` line under `Channel:` for channel- and thread-scope turns. DM turns never render it. ## Safety - The description is newline-collapsed to a single line before rendering, so a multi-line `about` value can never spoof another `[Context]` field. - It is capped at 500 characters on a UTF-8 char boundary, with a `…` truncation marker. - Unresolved channel metadata renders no `Description:` line. Session creation is untouched — the description rides the existing per-turn `[Context]` block that already carries `Channel:`. Signed-off-by: Will Pfleger <pfleger.will@gmail.com> Co-authored-by: Duncan <dcfd242e557282d7a1e2cf2e6877522682f1e5c6156dc92ca7d90eaedd3b0f95@buzz.block.builderlab.xyz>