Developer Fixes Silent Image-Stripping Bug Across Feishu and Telegram Channels
A developer building CliGate, a local AI assistant control plane, discovered that screenshots were being silently dropped before reaching Feishu and Telegram chat channels. The root cause was not a broken provider but an upstream capability map that listed only DingTalk as image-capable, causing the tool layer to strip image payloads before they reached any provider. A secondary issue arose because localhost image URLs are inaccessible to remote servers like Telegram, making direct URL passing unreliable in local-first setups. The fix required three coordinated changes: updating the channel capability list, making Feishu upload image bytes locally to obtain an image key, and having Telegram receive images via multipart upload rather than remote URL fetch. The case highlights that channel capability is not a single setting but an agreement that must be consistent across every layer of a delivery pipeline.
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