Create a source index for a multi-tab document with Gemini

A multi-tab document source index is useful when you need to show where each document tab obtains its supporting evidence. The result should make the underlying records easier to inspect and the next decision easier to explain. This guide develops a specific multi-tab document source index with a source schema, operating rules, a fictional example, and observable review checks. It is intended for someone who already has the underlying material and needs a dependable way to organize it.

Product references checked: 7 October 2026. The examples and implementation specifications below are original editorial guidance. They illustrate expected behavior and have not been presented as a benchmark or as a completed tool tested inside another product.

Define the deliverable and its scope

Gemini access to tab context varies by feature and account. Supply and verify tab coverage explicitly before publishing an index described as complete.

Write the acceptance standard before asking Gemini for a draft. A reviewer should be able to identify the tab id, inspect the coverage state, and understand the missing evidence without guessing what a blank field means. Decide which records belong in the deliverable, which are out of scope, and who can confirm the final interpretation. Keep those choices visible in the working specification rather than leaving the assistant to supply convenient defaults.

Prepare the source package

Gather an explicit inventory of Google Docs tabs, source lists and authorized excerpts per tab. Assign source IDs and preserve original wording wherever a small difference could change the outcome. Record the collection date and the version of each source. If two files disagree, keep both references and mark the conflict. Do not replace a disputed value with whichever one produces the cleanest display.

Use a small representative subset for the first draft. Include one ordinary record, one incomplete record, and one record that challenges an important rule. For this task, use the following as the incomplete-record check: An unsupplied tab remains unavailable. Preserve the original package separately from the assistant's transformed output. A polished result is easier to audit when its IDs still lead back to the original supplied material.

Define the record schema

Treat tab id as a deliberate part of the data model. Stable tab identifier, name and hierarchy path. Keep its representation consistent when you sort, filter, or revise the output. The coverage state field has a different job: Tab supplied, reviewed or unavailable. Combining these fields into one sentence can hide the distinction the reviewer needs to inspect.

Pay particular attention to claim location and source record. The former means: Claim or section location inside the identified tab. The latter means: Source ID and relevant excerpt or link. Store them separately and label both in the detail view or report. This makes disagreements visible at the exact point where they affect the result instead of burying them in a general note at the bottom.

Apply the task rules

Rule 1. Confirm the supplied tab inventory before claiming complete document coverage.

Rule 2. Do not assume that a current-tab answer includes all document tabs.

Rule 3. Reuse one source ID across tabs while preserving every claim location.

Rule 4. Keep missing tab access separate from a tab containing no sources.

Make these rules inspectable alongside the multi-tab document source index. Ask Gemini to describe how each rule affects a record and what should happen when the supplied data does not establish an answer. A rule written in prose still needs a defined output state. Use an explicit missing, disputed, or not-applicable label where appropriate, and reserve a valid zero or an empty result for cases where it has a defined meaning.

Work through a fictional example

A fictional document has Overview, Findings and Appendix tabs. Overview and Findings both cite source S1 at different claim locations. The index keeps one source record but two location relationships. Appendix has not been supplied, so its coverage is unavailable rather than source-free. Once the owner provides Appendix, the reviewer adds its source S2 and checks whether its claims are actually supported. A tab rename changes the display name but not its stable ID. The final index states which tabs were reviewed, allowing the reader to distinguish complete coverage from a partial document review.

Use the example as a review fixture rather than as real operational data. Before generating the output, write down which fields should be populated and which should remain unresolved. Then compare the generated result with that expectation. If Gemini supplies an unsupported value, correct the underlying instruction or calculation rule instead of merely editing the one visible record. Otherwise, the same error may return when the next record is processed.

Build the first version

Ask Gemini for an extraction table before asking for a polished multi-tab document source index. Review a few source references against the original material and correct the table first. Then request the reader-facing output using the approved fields. Keep changes to the source document separate from this drafting pass so a mistaken extraction does not automatically overwrite the authoritative record.

The final review should explicitly cover reuse relation: References reused across tabs without deleting their locations. Also check missing evidence: Unsupported claim or unavailable tab with follow-up needed. These two fields often establish whether a reader can act on the result. Make missing information visible beside the affected record and ask the owner for the exact evidence needed to resolve it.

A reusable prompt

Create a multi-tab document source index from the supplied source package. Goal: show where each document tab obtains its supporting evidence. Use these fields: Tab ID: Stable tab identifier, name and hierarchy path.; Coverage state: Tab supplied, reviewed or unavailable.; Claim location: Claim or section location inside the identified tab.; Source record: Source ID and relevant excerpt or link.; Reuse relation: References reused across tabs without deleting their locations.; Missing evidence: Unsupported claim or unavailable tab with follow-up needed.. Preserve source IDs. Rules: Confirm the supplied tab inventory before claiming complete document coverage. Do not assume that a current-tab answer includes all document tabs. Reuse one source ID across tabs while preserving every claim location. Keep missing tab access separate from a tab containing no sources.. First explain the proposed data model and unresolved inputs. Then build the smallest usable version. Use only supplied facts; label the demonstration fictional. Do not invent approvals, thresholds, owners, or external integrations. Include an empty state and explain the expected result for these checks: An unsupplied tab remains unavailable. A shared source retains separate claim locations in two tabs. Renaming a tab preserves its ID and source relationships.

Review behavior and edge cases

Check 1. An unsupplied tab remains unavailable. Record the observed result beside the expected result. If the check fails, isolate the affected rule and request a focused correction before rerunning the same case.

Check 2. A shared source retains separate claim locations in two tabs. Record the observed result beside the expected result. If the check fails, isolate the affected rule and request a focused correction before rerunning the same case.

Check 3. Renaming a tab preserves its ID and source relationships. Record the observed result beside the expected result. If the check fails, isolate the affected rule and request a focused correction before rerunning the same case.

Repeat the checks after adding another source record or changing the presentation. A working first example does not prove every record is handled correctly. Pay attention to retained selections, stale derived values, and unexplained changes in the number of displayed records. For multi-tab document source index work, the reviewer must be able to tell whether a difference comes from new evidence, an edited rule, or merely a changed view.

Maintain the reviewed version

Keep a version label, source cutoff, and short change record with the finished multi-tab document source index. Record who approved the rules and which demonstration cases were reviewed. When the source package changes, preserve record IDs and revisit the checks affected by the change. Do not treat yesterday's verified result as evidence that today's replacement input is complete.

Before handing the output to another person, review its audience and the material it contains. Use a sanitized demonstration for general feedback when the real source package is confidential. Explain whether changes are saved, whether the output is a preview, and which source remains authoritative. If persistence or sharing is required, verify that behavior in the actual account and intended environment instead of assuming it from a successful preview.

Frequently asked questions

Sources and related reading

Consult the current primary references for account-specific availability and controls: Gemini in Google Docs documentation, Google source-management documentation. The schema, examples, prompts, and review checks here are editorial recommendations rather than documented built-in features.

For broader context, read the related Gemini workflow guide.