Progressive rollout of agent prompts, models, and tools
Ship a new prompt, model, or tool to 1% of agent traffic, eval online, and auto-rollback without a deploy.
At a glance — Oct 2026
Updated 2026-10-27 · forward this page: /jtbds/progressive-agent-rollout#briefScores as of 2026-09-14 (43 days old; Depot marks scores stale after 30 days). The pick is still Depot's current editorial pick; it has not been re-reviewed since. Prices below carry their own dates.
- Depot Pick
- LaunchDarkly · 8.20/10 for this job (curated estimate, high confidence)
reliability of flag delivery + agent-specific DX. LaunchDarkly AgentControl is the purpose-built SKU; Statsig wins pricePerf. Distinct from evals (CI quality) — this is production traffic control.
- Runner-up
- Statsig · 8.33/10
Scores higher than the pick on: Price / performance, Developer & agent DX, Lock-in risk (higher = worse).
- When not to use the pick
- Want cheaper flags+experiments in one product and can tolerate Amplitude-era Statsig packaging — Statsig; only need offline evals not traffic splitting — Braintrust/Promptfoo.
- Lock-in / migration
- Runner-up Statsig has lower stored lock-in risk (4.8 vs 5.8, 0–10, higher = more lock-in).
- 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
- Non-determinism: Run the task more than once and compare the end state, not a single transcript. Record the trial count next to any success rate you cite.
- 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.
- Partial tool success: Require a per-item status and a failure count. Success for the task requires the failed count to be zero or explicitly handed to a retry queue.
- Runaway spend: Set a budget and a tool-call cap per task. Alert when spend jumps. Stop the run at the cap instead of summarizing a partial trace as success.
- Tool loop: Hash the last several tool names and arguments. Stop when the same call repeats and the observation did not change. Cap tool calls per task.
Cite: Agent Provider Depot, Depot Pick for progressive-agent-rollout: launchdarkly, scores as of 2026-09-14. Agents: GET /api/decide?jtbd=progressive-agent-rollout
LaunchDarkly
reliability of flag delivery + agent-specific DX. LaunchDarkly AgentControl is the purpose-built SKU; Statsig wins pricePerf. Distinct from evals (CI quality) — this is production traffic control.
Pricing (directional): As of 2026-09-14 (launchdarkly.com/pricing): Developer $0 — unlimited seats, 5 service connections, 1k client MAU, 5k AI runs/mo, 14-day AgentControl retention. Foundation PAYG (yearly): $10/service connection/mo + $8.33/1k client MAU/mo; 5…
Lock-in risk: higher = more lock-in (worse). Overall already inverts this dimension.
Depot pick for progressive delivery of agent prompts/models/tools in production. Statsig if you want cheaper experimentation+flags in one product and can tolerate Amplitude-era packaging flux.
Quote for Progressive rollout of agent prompts, models, and tools
Depot Pick stays LaunchDarkly. Prices below are sourced SKU rows only (as of 2026-10-27). Input and output are not blended. GET /api/quote?jtbd=progressive-agent-rollout
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.
8 of 8 candidates have no sourced price row. 8 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
Statsig
Best price/perf flags+experiments for product agents. Confirm Amplitude commercial terms at renewal…
Braintrust
Depot pick when evals are the product quality gate. Pair with Helicone/Langfuse for cheap request logs if…
Langfuse
Depot default observability for most agent teams: open, affordable, good enough to serious.
GrowthBook
OSS/commercial peer to LaunchDarkly/Statsig for progressive agent rollout. GrowthBook when you want…
Unleash
Flags-first OSS peer. Prefer for kill-switches and audited rollouts; GrowthBook when experiments are the…
Flagsmith
GrowthBook remains Depot OSS flags pick (experimentation + flags). Flagsmith when you want flags-first…
PostHog
Flags/analytics peer. Depot oss-feature-flags pick stays GrowthBook; LaunchDarkly for AgentControl; PostHog…
When NOT to use the top pick
Want cheaper flags+experiments in one product and can tolerate Amplitude-era Statsig packaging — Statsig; only need offline evals not traffic splitting — Braintrust/Promptfoo.
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 | Langfuse | 8.7 | 8.8 | 9.2 | 8.4 | 8.8 | 2026-09-14 |
| 2 | GrowthBook | 8.4 | 8.6 | 9.0 | 8.2 | 8.8 | 2026-09-14 |
| 3 | Unleash | 8.4 | 8.8 | 7.8 | 8.8 | 8.6 | 2026-09-14 |
| 4 | PostHog | 8.4 | 8.4 | 8.8 | 8.4 | 9.0 | 2026-09-14 |
| 5 | Statsig | 8.3 | 8.6 | 8.8 | 8.6 | 8.8 | 2026-09-14 |
| 6 | Braintrust | 8.2 | 9.2 | 7.5 | 8.6 | 8.8 | 2026-10-19 |
| 7 | Flagsmith | 8.2 | 8.0 | 8.6 | 8.2 | 8.4 | 2026-09-14 |
| 8 | LaunchDarklyDepot Pick | 8.2 | 9.0 | 6.8 | 9.2 | 8.6 | 2026-09-14 |
Score methodology for this job
reliability of flag delivery + agent-specific DX. LaunchDarkly AgentControl is the purpose-built SKU; Statsig wins pricePerf. Distinct from evals (CI quality) — this is production traffic control.
capabilityFit: 25%pricePerformance: 18%latencyReliability: 15%developerDx: 15%privacyPosture: 10%lockInRisk: 7%maturity: 10%