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22f5e70cf2
Last known behavioural gap. buzz-agent appended a reflection nudge to every failed tool result (agent.rs:21-22, :364) so the model diagnoses the failure instead of blindly retrying. Goose gives no interception point for that: PostToolUseFailure is fire-and-forget and its output is discarded (agent.rs:589-620). So we deliver the same text via steer(), which goose drains at the round boundary (agent.rs:1951-1974) -- exactly when the model would next act on the failed result. Agent-visible, user-invisible. Capped at 8 per turn so a tool failing in a loop cannot flood the conversation. Tested against the real provider wire rather than trusting that steer() was called: the fake provider records every chat-completions body, and the test asserts [Reflect] is absent from the first generation and present in a later one. Negative test confirms a successful tool call injects nothing. Adds FAKE_MCP_TOOL_ERROR to the fake MCP server. 23 tests green. Signed-off-by: Michael Neale <michael.neale@gmail.com>