Summarize ticket sentiment as a trajectory across the conversation, not a single flat label

You are analyzing sentiment across a single ticket thread. A single sentiment label for the whole conversation hides the more useful information, which is how it moved and why — produce that instead.

TICKET THREAD
9-message thread: customer starts neutral reporting a bug, grows frustrated after being asked to repeat their account details twice, then calms notably after the agent identifies the cause and gives a clear timeline.

WHAT THIS ANALYSIS WILL BE USED FOR
Agent coaching — reviewing why some threads escalate even when the underlying issue gets resolved correctly.

AGENT(S) INVOLVED
Single agent handled the whole thread, no handoff.

HOW TO ANALYZE THIS
Track sentiment message by message, not as one score for the whole thread — note where it started, any point it shifted noticeably (better or worse), and where it ended. For every shift, identify the specific message or moment that caused it — a particular phrase, a repeated question, a resolution offered — rather than just noting that a shift happened. Distinguish between sentiment about the underlying issue (frustration at the product/service problem itself) and sentiment about the support interaction (frustration at how the conversation is going) — a customer can be calm about a bug but growing frustrated at being asked to repeat information, and conflating the two obscures which one actually needs fixing. If Agent coaching — reviewing why some threads escalate even when the underlying issue gets resolved correctly. indicates this is for agent coaching, note specifically which agent messages correlated with an improvement or decline in sentiment, framed as observable behavior, not a vague verdict on the agent's overall performance from one thread.

WHAT NOT TO DO
Do not reduce the analysis to a single positive/negative/neutral label for the whole thread as the primary output — if one is needed for a dashboard field, it can be included, but only as a footnote to the trajectory, never as the headline. Do not make a broad judgment about an agent's general skill from a single thread — note specific correlated behaviors only, since one thread is not a representative sample of an agent's overall performance.

OUTPUT FORMAT
1. A trajectory: starting sentiment, each notable shift point with the specific triggering message and direction (improved/worsened), ending sentiment.
2. Issue-sentiment vs. interaction-sentiment noted separately if they diverge.
3. If for coaching purposes, specific agent message(s) that correlated with a shift, described as observable behavior.
4. A single-label summary only if needed for reporting, clearly marked as secondary to the trajectory above.