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Head to head · Obs traces · October 2026 research run

Galileo API + MCP vs LangWatch

LangWatch scores 65.5 (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 agent ergonomics. Both do obs traces.

Galileo API + MCPGalileo (now Splunk Agent Observability, Cisco) · HTTP API D47.7/100#735 of 841 LangWatchReasoning Engine B.V. (LangWatch) · HTTP API B65.5/100#291 of 841

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

  • Agent ergonomics, 73 against 67

Watch for

No status page, no published rate limits and no SLA

LangWatch B

Good for Teams that want tracing, evaluations and simulated-user agent tests in one open-source product, hosted in the EU or self-hosted, and that drive it from a coding assistant through MCP or the CLI.

Ahead on

  • Reliability, 53 against 18
  • Schema & documentation, 87 against 79
  • Security & auth, 71 against 33
  • Payments & pricing, 40 against 20
  • Maintenance & community, 90 against 74
  • Transparency & trust, 75 against 53

Also in its favour

  • Runs on your own machine
  • Free to start without a card
  • Open source

Watch for

The MCP server registers 101 tools, deletes and key creation among them, with no toolsets and no readOnlyHint or destructiveHint annotations in the source

Score by category

CategoryWeight this runGalileo API + MCPLangWatchEdge
Reliability16%201853LangWatch +35
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27987LangWatch +8
Agent ergonomics13%16.27367Galileo API + MCP +6
Security & auth14%17.53371LangWatch +38
Payments & pricing10%12.52040LangWatch +20
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.87490LangWatch +16
Transparency & trust7%8.85375LangWatch +22
Negative events≤150-2
Total47.7 · D65.5 · B

Facts side by side

FactGalileo API + MCPLangWatch
KindHTTP APIHTTP API
VendorGalileo (now Splunk Agent Observability, Cisco)Reasoning Engine B.V. (LangWatch)
Hosted endpointhttps://api.galileo.ai/v2https://app.langwatch.ai
TransportsHTTP, Streamable HTTPHTTP, Streamable HTTP, SSE (legacy), stdio
AuthAPI keyOAuth or key
PricingFreemiumFreemium
x402nono
LicenceApache-2.0 (SDKs only, platform closed source)Apache 2.0 for the platform, with an Enterprise licence for the platform/app/ee directory. The SDKs and the MCP server are MIT
Tools exposed8101
Read-only variant documentednono
llms.txtyesyes
Last release2026-10-012026-10-02
Terms last updatedno date given2026-09-22
Privacy policy last updated2024-11-012026-09-29
Customer content may train modelsyesnot found in the text
Terms restrict automated accessnot found in the textyes
Terms restrict benchmarkingyesnot found in the text
Terms or service can change without noticenot found in the textyes
Arbitration or class-action waiveryesnot found in the text
Popularity1.4k npm/wk, 6.2k PyPI/wk4.9k stars, 50k npm/wk, 87k 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.

LangWatch

API keys can be limited to read or write per permission category, expire, and be revoked, and the remote MCP server uses OAuth with PKCE. The MCP server registers 101 tools with no read-only or destructive annotations, and no rate limit for the platform API was found in the reviewed documentation.

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

LangWatch

  1. Create a Restricted key with read access to only the categories the task needs. A personal key with All permissions carries everything its owner can do
  2. Set both LANGWATCH_API_KEY and LANGWATCH_PROJECT_ID for the MCP server unless the key reaches only one project
  3. Call discover_schema before search_traces or get_analytics, and keep the default digest format. json returns the full raw trace
  4. Allowlist MCP tools in the client. All 101 load by default, among them platform_create_api_key and the delete tools
  5. Follow next_cursor until it is null on list endpoints. A full page does not mean more rows exist

Questions

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

LangWatch scores 65.5 (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 agent ergonomics.

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

Galileo API + MCP needs an API key. LangWatch takes an API key or an OAuth sign-in.

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

Yes. Galileo API + MCP has a hosted endpoint at https://api.galileo.ai/v2 and LangWatch at https://app.langwatch.ai.

Are Galileo API + MCP and LangWatch open source?

No open-source release is listed for Galileo API + MCP. LangWatch is open source (Apache 2.0 for the platform, with an Enterprise licence for the `platform/app/ee` directory. The SDKs and the MCP server are MIT).

Other comparisons with Galileo API + MCP or LangWatch

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