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Every assistant answer has a collapsed Evidence row. Tool-backed answers show the recorded steps and checks; a tool-free answer is labeled Evidence · general knowledge.

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Evidence and verification

Evidence is not proof that the model chose the right source or interpreted the question correctly. Verification is not new source material; it checks the answer against existing evidence.

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Inspect an answer

1

Open Evidence

The summary shows the number of steps, total tool time, and how many findings need review.
2

Open step details

Expand each step to see its SQL or arguments, result summary, output, and up to 20 displayed table rows. Charts render below the answer rather than inside the fold.
3

Read verification findings

A check mark is a passed check. A warning means the check found something to review; it does not automatically invalidate the entire answer.

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What to inspect first

  1. Source selection: Did Fella use the right file or table?
  2. Schema: Are the column type, casing, units, and nulls what you expected?
  3. Query: Does the WHERE, grouping, join, and aggregate match the words in your question?
  4. Rows: Do the returned values support the sentence in the answer?
  5. Checks: Did verification find a warning or a query that changed on re-run?

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What verification checks

The deterministic pass can flag unknown tables, changed or broken query re-runs, unsupported figures, text-column aggregates, exact-case filters, missing aggregate operations or columns, likely missed joins, null date buckets, and mislabeled values in single-row aggregate results. If a query re-run changes or fails, Fella can make one tool-free corrective model request. If any warning remains, an optional cost-gated second opinion can compare the answer’s figures. That second opinion is model-based, not deterministic.

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Warnings are signals

A warning is not proof that the whole answer is wrong. For example, a TEXT amount column may be intentionally textual, but aggregating it without a cast is risky. Read the query and decide whether the warning matters to your files. Queries slower than 500 ms and truncated queries are not re-run; verification records that it trusted the first result. Number matching is tolerant and heuristic, so a pass does not establish semantic correctness.

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Evidence after stopping

Stopping a run does not throw away the work. Partial tool results remain available in the transcript, so you can understand where the run stopped or ask a narrower follow-up.
/sql prints a direct query result without an assistant answer. It therefore has no evidence fold and no post-answer verification.

Verification details

See every deterministic check and its limits.

Tool catalog

See the guardrails on each built-in tool.