Original Answer With Audit Markup

Left column: the agent's original answer. Right column: independent verification notes and evidence.

Short answer: total Q1 2026 vendor spend was $1,284,5001, up 18% from Q42. The largest vendor was Acme Logistics at $312,0003.

Breakdown by category

Category	Q1 spend
Logistics	$512,0003
Software	$298,0004
Facilities	$474,500

Recommendation

Renegotiate the Software category at next renewal — spend there is growing ~30% quarter over quarter5.

Sources under audit: vendor_invoices_q1.csv (S1), q4_spend_summary.xlsx (S2). Deliverable: q1_spend_summary.xlsx (D1).

Verification Comments

Summary Verdict

Source-backed totals reconcile, but two derived figures fail: the Q4 growth rate was computed against the wrong base, and the "~30% QoQ" software claim has no support in the sources. Restate both as corrected or remove.

C1Pass

Total Q1 spend $1,284,500

Independently re-summed from the source invoices; matches the deliverable to the cent.

Evidence observed

sum(vendor_invoices_q1.csv:amount) = 1,284,500.00 over 412 rows; D1 cell B2 = 1,284,500. Match.

Back to marked text

C2Fail

"Up 18% from Q4"

Wrong base. Q4 total is $1,147,000; the correct increase is 12.0%, not 18%. The 18% figure divides by a Q4 subtotal that excludes Facilities.

Evidence observed

(1,284,500 - 1,147,000) / 1,147,000 = 0.1199. The 18% uses 1,284,500/1,088,500 (Facilities dropped from the Q4 base in S2).

Back to marked text

C3, C6Pass

Top vendor + Logistics category

Acme Logistics is the top vendor at $312,000, and the Logistics category total of $512,000 reconciles.

Evidence observed

groupby(vendor)[amount].max() = Acme Logistics 312,000; category=Logistics sum = 512,000.

Back to marked text

C4Partial

Software category $298,000

The figure is correct, but it bundles two annual licenses paid in Q1 that should be amortized — defensible, but flag the methodology.

Evidence observed

category=Software sum = 298,000; includes $84,000 of annual prepayments (rows 188, 203).

Back to marked text

C5Fail

"Software growing ~30% QoQ"

Unsupported. The sources contain no prior-quarter software figure to compute a QoQ rate; this appears to be an unsourced inference.

Evidence observed

q4_spend_summary.xlsx (S2) has no Software line item; no basis for a 30% QoQ claim was found in either source.

Back to marked text