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Evidence logs make provider failures explainable.
AxiOwl crosses many boundaries: CLI parsing, registry lookup, sender resolution, final body construction, delivery worker dispatch, provider edge delivery, MCP reply, and remote relay. A failure at any one boundary can look like "the message did not work" unless the system records what happened.
Evidence logs give each step a durable trace.
The log entries should be structured, timestamped, and specific. They should say what event occurred, what message id or run id was involved, which target was selected, which provider was used, and what error was returned.
This is not just for developers. It helps users and support agents avoid repeating the same failed actions. If the log shows target resolution failed, there is no reason to keep testing the provider bridge. If the log shows provider acceptance but no MCP reply, the next investigation should focus on reply tooling and sender identity.
Evidence logs also reduce token usage. Instead of asking an agent to reconstruct a long history from chat, the user can provide a compact event trail. The supervising agent can reason from facts rather than from memory.
Good logs should not hide errors behind generic messages. A provider-specific edge should explain the evidence it has. For example, a missing bridge extension, stale registry row, closed MCP transport, or failed auth should be visible.
Evidence logs are the product's memory of what it tried.
Without them, every failure becomes a new mystery. With them, failures become steps in a known pipeline.