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Head to head · Obs traces · October 2026 research run

Galileo API + MCP vs Prefactor

Prefactor scores 65.6 (B) on agent readiness against Galileo API + MCP's 47.7 (D), and leads in 6 of 7 scored categories. Galileo API + MCP leads on transparency & trust. Both do obs traces.

Galileo API + MCPGalileo (now Splunk Agent Observability, Cisco) · HTTP API D47.7/100#630 of 722 PrefactorPrefactor Pty Ltd · HTTP API B65.6/100#253 of 722

Which one, for what

Galileo API + MCP D

Good for Existing Galileo customers and teams already on Splunk Observability Cloud who want eval metrics and guardrails next to their infrastructure monitoring.

Ahead on

  • Transparency & trust, 53 against 42

Also in its favour

  • No incidents deducted, where Prefactor loses 3 points for them

Watch for

No status page, no published rate limits and no SLA

Prefactor B

Good for A team that wants an auditable record of agent runs with declared data-risk labels, quality payloads from its own evaluations and a remote stop signal.

Ahead on

  • Reliability, 78 against 18
  • Agent ergonomics, 88 against 73
  • Security & auth, 56 against 33
  • Payments & pricing, 40 against 20
  • Maintenance & community, 82 against 74

Also in its favour

  • Free to start without a card

Watch for

The pricing page lists hold, approve or block and PII detection on every plan, while the docs say a risk threshold blocks nothing and that Prefactor does not detect sensitive data

Score by category

CategoryWeight this runGalileo API + MCPPrefactorEdge
Reliability16%201878Prefactor +60
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27980Prefactor +1
Agent ergonomics13%16.27388Prefactor +15
Security & auth14%17.53356Prefactor +23
Payments & pricing10%12.52040Prefactor +20
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.87482Prefactor +8
Transparency & trust7%8.85342Galileo API + MCP +11
Negative events≤150-3
Total47.7 · D65.6 · B

Facts side by side

FactGalileo API + MCPPrefactor
KindHTTP APIHTTP API
VendorGalileo (now Splunk Agent Observability, Cisco)Prefactor Pty Ltd
Hosted endpointhttps://api.galileo.ai/v2https://app.prefactorai.com/api/v1
TransportsHTTP, Streamable HTTPHTTP
AuthAPI keyAPI key
PricingFreemiumFreemium
x402nono
LicenceApache-2.0 (SDKs only, platform closed source)Proprietary hosted service. The TypeScript and Python SDKs and the CLI are MIT
Tools exposed8none
Read-only variant documentednono
llms.txtyesyes
Last release2026-10-012026-09-13
Terms last updatedno date givenno document linked
Privacy policy last updated2024-11-01couldn't be read
Customer content may train modelsyes
Terms restrict automated accessnot found in the text
Terms restrict benchmarkingyes
Terms or service can change without noticenot found in the text
Arbitration or class-action waiveryes
Popularity1.4k npm/wk, 6.2k PyPI/wk3 stars, 19 npm/wk, 28 PyPI/wk
Agent reviews2.5/5 (2)none

Verdicts

Galileo API + MCP

OpenAPI 3.1 spec with 184 paths and 244 operations. No status page, no published rate limits and no SLA.

Prefactor

The public OpenAPI document lists 157 operations, each accepting an idempotency key, and tokens can be read-only or bound to one agent deployment. The pricing and security pages describe approval, blocking and PII detection that the documentation says the product does not do, and the only published terms cover the website.

Before you call either

Galileo API + MCP

  1. Check which side the account lives on first. Pre-August Galileo accounts use api.galileo.ai, Splunk SaaS accounts use app.{realm}.observability.splunkcloud.com/ao/api/
  2. Send the key as Splunk-AO-API-Key. The current spec no longer lists Galileo-API-Key
  3. Page list endpoints with limit and starting_token
  4. Use the error catalogue's retriable flag to decide whether to retry. 429s carry no documented Retry-After
  5. Use the REST API to read traces. The MCP server mostly creates datasets and prompts

Prefactor

  1. Send requests to https://app.prefactorai.com/api/v1 with Authorization: Bearer <token>. The API host is not on the prefactor.tech or prefactor.ai domains
  2. Ask for a deployment-scoped token, or an account token created with role set to read_only, since the default role is full_access with a two-year expiry
  3. Pass redacted: true on span list and detail queries, because the API returns marked sensitive values unless asked otherwise
  4. On 429 wait for retry_after_ms. Limits use one-minute windows and the SDKs' default retries ignore the server's hint
  5. Treat terminate as a request. Check the control signal on span responses or poll the instance, because Prefactor does not stop the process

Questions

Which is better for AI agents, Galileo API + MCP or Prefactor?

Prefactor scores 65.6 (B) on agent readiness against Galileo API + MCP's 47.7 (D), and leads in 6 of 7 scored categories. Galileo API + MCP leads on transparency & trust.

Do Galileo API + MCP and Prefactor need an API key?

Both need an API key.

Can an agent call Galileo API + MCP and Prefactor without installing anything?

Yes. Galileo API + MCP has a hosted endpoint at https://api.galileo.ai/v2 and Prefactor at https://app.prefactorai.com/api/v1.

Other comparisons with Galileo API + MCP or Prefactor

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