Outcome & claim verification receipts
Verify that an autonomous agent task actually produced its claimed external side-effect or artifact via deterministic graders, traces, or cryptographic claim receipts.
At a glance — Oct 2026
Updated 2026-10-28 · forward this page: /jtbds/outcome-verification#briefPromotion class: deterministic_source_reverified · 8.3 ± 0.6 (7.7–8.9 · editorial_plus_verified_receipt) · Pricing verified 2026-10-27.
- Depot Pick
- Braintrust · 8.28/10 for this job (curated estimate, high confidence)
Braintrust deterministic scorers + CI eval gates verify agent task outcomes before deployment; Depot discloses its affiliation with Countersign (Signalry) and never awards Depot Pick to a sister project.
- Runner-up
- LangSmith · 8.14/10
Scores higher than the pick on: Latency / reliability, Developer & agent DX, Maturity / track record.
- When not to use the pick
- LangGraph-native trace assertions — LangSmith; self-hosted OpenTelemetry trace verification — Arize Phoenix; hallucination/lynx guardrail grading — Patronus AI. Disclosure: Depot also uses Countersign (countersign.signalry.ai, a sister project by the same operator) for cryptographic claim receipts; because of our conflict-of-interest policy, Countersign is disclosed as an affiliated protocol rather than named Depot Pick.
- Lock-in / migration
- The pick has lower stored lock-in risk than runner-up LangSmith (5 vs 6.5).
- Sourced price (no comparable unit)
Pick: no sourced price in this job's unit (no_sourced_price).
No cheapest SKU (no_comparable_unit_for_job). No price was invented.
- Free option
- No free resource lists this job. A cheap paid SKU is not a free option.
- Failure modes to watch
- Observability gap: Alert on a drop in trace ingestion and on certificate expiry for the trace host. Do not treat a missing trace as a successful quiet run.
Cite: Agent Provider Depot, Depot Pick for outcome-verification: braintrust, scores as of 2026-10-28. Agents: GET /api/decide?jtbd=outcome-verification
Braintrust
Braintrust deterministic scorers + CI eval gates verify agent task outcomes before deployment; Depot discloses its affiliation with Countersign (Signalry) and never awards Depot Pick to a sister project.
Pricing (directional): Eval-first platform; data-based pricing with unlimited seats on many plans; strong CI eval story.
Lock-in risk: higher = more lock-in (worse). Overall already inverts this dimension.
Depot pick when evals are the product quality gate. Pair with Helicone/Langfuse for cheap request logs if needed.
Quote for Outcome & claim verification receipts
Depot Pick stays Braintrust. Prices below are sourced SKU rows only (as of 2026-10-28). Input and output are not blended. GET /api/quote?jtbd=outcome-verification
Nothing was compared. no comparable sourced unit for this job; chat input $/1M and other units were not borrowed pickIsPriceWinner is null.
Sourced price unavailable for the Depot Pick. No row in the pricing index.
5 of 6 candidates have no sourced price row. 6 are excluded from the Matching price comparison (none). no comparable sourced unit for this job; chat input $/1M and other units were not borrowed
Runners-up
LangSmith
If you live in LangGraph, LangSmith is the obvious observatory. Otherwise compare Langfuse/Helicone first.
Arize Phoenix
Choose Phoenix when you want open-source observability you can own. Cloud Arize when enterprise wants a…
Patronus AI
Layer on when regulated hallucination/safety gates matter more than general CI evals. Lakera for injection…
Countersign
Deterministic outcome verification ledger for AI agents with hash-chained receipts and live rechecks.
When NOT to use the top pick
LangGraph-native trace assertions — LangSmith; self-hosted OpenTelemetry trace verification — Arize Phoenix; hallucination/lynx guardrail grading — Patronus AI. Disclosure: Depot also uses Countersign (countersign.signalry.ai, a sister project by the same operator) for cryptographic claim receipts; because of our conflict-of-interest policy, Countersign is disclosed as an affiliated protocol rather than named Depot Pick.
Full ranking (score table)
Ranked with this JTBD's weights. Scores are curated estimates unless marked otherwise. Agents: prefer /api/decide then this table for tie-breaks.
| # | Provider | Overall | Fit | $/perf | Latency | DX | As of |
|---|---|---|---|---|---|---|---|
| 1 | Countersign | 8.7 | 8.8 | 9.4 | 8.8 | 8.9 | 2026-10-28 |
| 2 | Langfuse | 8.7 | 8.8 | 9.2 | 8.4 | 8.8 | 2026-10-28 |
| 3 | Arize Phoenix | 8.4 | 8.6 | 9.0 | 8.2 | 8.0 | 2026-10-28 |
| 4 | BraintrustDepot Pick | 8.3 | 9.2 | 7.5 | 8.6 | 8.8 | 2026-10-28 |
| 5 | LangSmith | 8.1 | 9.0 | 7.0 | 8.8 | 9.0 | 2026-10-28 |
| 6 | Patronus AI | 7.3 | 8.4 | 5.5 | 8.0 | 7.2 | 2026-10-28 |
Score methodology for this job
Braintrust deterministic scorers + CI eval gates verify agent task outcomes before deployment; Depot discloses its affiliation with Countersign (Signalry) and never awards Depot Pick to a sister project.
capabilityFit: 26%pricePerformance: 16%latencyReliability: 16%developerDx: 18%privacyPosture: 9%lockInRisk: 7%maturity: 8%