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Answer at a glance: What connects to what? What changed? What proves it? Build an evidence view, not a decorative diagram; source, diff, and command output remain ground truth.

1. Set the focus

Use the request and repository context. Do not ask for details that can be discovered from the repository. State the smallest boundary that answers the question. Gather only:

• definitions, callers, consumers, configuration, and ownership;
• current diff or before/after revisions;
• verify command, exit code, decisive output, and coverage gaps.

Never expose private chain-of-thought. Show observable evidence and conclusions.

2. Normalize the evidence

Keep five kinds: Entities, Relations, Changes, Proof, and Gaps. Label inference as ? inferred; never draw a guessed edge as fact.

3. Choose the smallest useful view

Prefer the first form that carries the relationship clearly:

• decision → compact pseudocode;
• runtime calls → call tree;
• ownership → shallow tree;
• 3+ interacting parts → Mermaid flow/sequence;
• structural change → before/after diff;
• completion → requirement-to-proof map;
• clear prose → one sentence or short list.

Use one primary view. Add another only for a different question. Reserve focused HTML for dense UI or interactive state. Keep HTML temporary unless the user asks to keep it, and open it only with permission.

4. Render with a stable grammar

A --> B             calls or moves data
A --owns--> B       named relation
+ / - / ~ item      added / removed / changed
[+] proven
[x] disproven
[?] unknown
[path/file:line]    source

Keep labels concrete and short. Omit unrelated detail. For Mermaid, keep node IDs simple, quote punctuation-heavy labels, and put noisy source pointers outside.

5. Attach evidence

Every important node or edge must be traceable to source, a diff/revision, or an exact command, exit code, and shortest decisive output. A green-looking view is not verification. If no command ran, write not run. If proof misses a claim, mark that claim [?] and name the gap; keep failed proof visible.