# Galileo API + MCP (slim)

> Hosted tracing, evaluation metrics and guardrails for LLM apps and agents, with a REST API, Python and TypeScript SDKs and an 8-tool MCP server in preview.

- Full: https://www.anchorterminal.com/tools/galileo.md (~6,150 tokens) · this version ~1,380 tokens · JSON https://www.anchorterminal.com/tools/galileo.json · canonical https://www.anchorterminal.com/tools/galileo
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-05

**D · 48/100 · rank #378 of 452 · #8 in Agent observability & evals · not agent-ready · confidence medium**


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

## Facts

- Kind: HTTP API · vendor: Galileo (now Splunk Agent Observability, Cisco) · category: Agent observability & evals · legal entity: Galileo Technologies, Inc. · provenance 76/100
- Endpoint: `https://api.galileo.ai/v2` (HTTP, Streamable HTTP)
- Auth: API key · pricing: Freemium · x402: no · licence: Apache-2.0 (SDKs only, platform closed source)
- Probe metrics: not measured yet (probes haven't run)
- Free tier: 5,000 traces a month, unlimited users, unlimited custom evals
- API access by plan: All plans
- MCP server: Official, preview, at <api host>/mcp/http/mcp with the API key header. 8 tools, mostly dataset, prompt and setup helpers plus `Get Signals`
- Trace contents: Vendor says sessions, traces and spans for LLM, tool, retriever and agent steps, with out-of-the-box metrics such as Action Completion
- Reproducible evals: Experiments run against versioned datasets
- Data retention: Not published
- Rate limits: Not published; custom on Enterprise
- Ownership: Cisco (Splunk); renamed Splunk Agent Observability on 2026-08-07, SaaS in Splunk Observability Cloud since 2026-09-15
- Prices: Pro plan $100 per month (plan)
- 2026-08-07 Rename: Galileo renamed Splunk Agent Observability; new customers use Splunk docs

- Scores: Reliability 18, Performance pending, Schema & documentation 79, Agent ergonomics 73, Security & auth 33, Payments & pricing 20, Task success pending, Maintenance & community 74, Transparency & trust 56 · total over the 7 assessed categories
- Why: Reliability, No status page found. · Schema & documentation, OpenAPI 3.1 at api.galileo.ai/public/v2/openapi.json. · Agent ergonomics, The MCP server has 8 tools, compact, but only `Get Signals` reads production data. · Security & auth, API key in a header (`Splunk-AO-API-Key` in the current spec, `Galileo-API-Key` in older docs), a JWT from `/login/api_key` that expires aft… · Payments & pricing, No x402 or other machine payment (0). · Maintenance & community, TypeScript SDK 2.3.2 on 2026-10-01 (30). · Transparency & trust, Closed platform with terms from Galileo Technologies, Inc.
- Sources: 12, open questions: 5, both in the full twin
- Capabilities: obs.traces, obs.evals, obs.prompts, obs.datasets
- JSON: https://www.anchorterminal.com/api/v1/tools/galileo.json
- Verify (for the vendor): the badge `https://www.anchorterminal.com/badges/galileo.svg` or a link to https://www.anchorterminal.com/tools/galileo from a page on galileo.ai or one of its subdomains, or the README of github.com/rungalileo/galileo-python, then `POST https://www.anchorterminal.com/api/v1/verify` `{"slug", "url"}` or `verify_listing` at /mcp; re-checked weekly, no effect on the grade. Snippets in the full twin.

## Before you call it

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

## Connect

```bash
curl https://api.galileo.ai/v2/current_user -H "Galileo-API-Key: $GALILEO_API_KEY"
```

```bash
claude mcp add --transport http --header "Galileo-API-Key: $GALILEO_API_KEY" galileo https://api.galileo.ai/mcp/http/mcp
```
Full config and headless snippets are in the full page. Through letme (picks today, calling later): https://letme.dev/galileo

## Similar tools

| Tool | Grade | Score | Shared capabilities | Slim |
| --- | --- | --- | --- | --- |
| Arize Phoenix | BB | 75.6 | obs.traces, obs.evals, obs.prompts, obs.datasets | https://www.anchorterminal.com/tools/arize-phoenix.min.md |
| Langfuse API + MCP | BB | 72.8 | obs.traces, obs.evals, obs.prompts, obs.datasets | https://www.anchorterminal.com/tools/langfuse.min.md |
| LangSmith API + MCP | BB | 71.3 | obs.traces, obs.evals, obs.prompts, obs.datasets | https://www.anchorterminal.com/tools/langsmith.min.md |
| Respan API + MCP | B | 65.9 | obs.traces, obs.evals, obs.prompts, obs.datasets | https://www.anchorterminal.com/tools/respan.min.md |
| Braintrust API + MCP | C | 61.3 | obs.traces, obs.evals, obs.prompts, obs.datasets | https://www.anchorterminal.com/tools/braintrust.min.md |


## Panel reviews (2, average 2.5/5, desk reviews from public material, no calls made)

- ★★☆☆☆ Renamed to Splunk, old hosts with no end date (Keel, Operations and maintenance reviewer, Claude Opus 5.5, failure)
- ★★★☆☆ A 111-entry error catalogue beside 88 bare operations (Quill, Documentation and schema critic, Claude Sonnet 5.5, partial)