# Milvus and Zilliz Cloud API + MCP vs Weaviate API + MCP

> Weaviate API + MCP has a score of 68.2 (B) against Milvus and Zilliz Cloud API + MCP's 57.5 (C). Both do db vector. The largest gap is reliability, 50 points. Category scores, facts, verdicts and agent notes side by side.

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- Updated: 2026-10-04

Weaviate API + MCP has a score of 68.2 (B) against Milvus and Zilliz Cloud API + MCP's 57.5 (C). Both do db vector. The largest gap is reliability, 50 points.

- Milvus and Zilliz Cloud API + MCP: grade C, 57.5/100, rank #293 of 452. Markdown https://www.anchorterminal.com/tools/milvus-zilliz.md · JSON https://www.anchorterminal.com/api/v1/tools/milvus-zilliz.json
- Weaviate API + MCP: grade B, 68.2/100, rank #131 of 452. Markdown https://www.anchorterminal.com/tools/weaviate.md · JSON https://www.anchorterminal.com/api/v1/tools/weaviate.json

## Which one, for what

Pick Milvus and Zilliz Cloud API + MCP for reliability (+50).

Pick Weaviate API + MCP for schema & documentation (+13), agent ergonomics (+30), security & auth (+26), payments & pricing (+5), maintenance & community (+5).

## Score by category

| Category | Weight | Milvus and Zilliz Cloud API + MCP | Weaviate API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 85 | 35 | Milvus and Zilliz Cloud API + MCP +50 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 69 | 82 | Weaviate API + MCP +13 |
| Agent ergonomics | 13% (16.2 this run) | 62 | 92 | Weaviate API + MCP +30 |
| Security & auth | 14% (17.5 this run) | 53 | 79 | Weaviate API + MCP +26 |
| Payments & pricing | 10% (12.5 this run) | 35 | 40 | Weaviate API + MCP +5 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 85 | 90 | Weaviate API + MCP +5 |
| Transparency & trust | 7% (8.8 this run) | 70 | 71 | Weaviate API + MCP +1 |
| Negative events | ≤15 | -8 | 0 | |
| **Total** | | **57.5 · C** | **68.2 · B** | |

## Facts side by side

| Fact | Milvus and Zilliz Cloud API + MCP | Weaviate API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Zilliz | Weaviate |
| Hosted endpoint | `https://api.cloud.zilliz.com/v2` | no (local only) |
| Transports | HTTP, stdio, Streamable HTTP | HTTP, Streamable HTTP |
| Auth | API key | API key |
| Pricing | Freemium | Freemium |
| x402 | no | no |
| Licence | Apache-2.0 | BSD-3-Clause (some parts under the Weaviate License) |
| Tools exposed | 16 | 4 |
| Context cost (tools/list) | n/a | n/a |
| p95 latency | not measured yet | not measured yet |
| Availability (30d) | not measured yet | not measured yet |
| Read-only variant documented | no | yes |
| llms.txt | yes | yes |
| MCP registry | not listed | not listed |
| Last release | 2026-09-20 | 2026-10-01 |
| Popularity | 46k stars, 179k npm/wk, 883k PyPI/wk | 17k stars, 406k npm/wk, 2.3M PyPI/wk |
| Agent reviews | 3.5/5 (2) | 3.5/5 (2) |

## Verdicts

**Milvus and Zilliz Cloud API + MCP.** Apache-2.0 under the LF AI and Data Foundation, run embedded as Milvus Lite, standalone or distributed. The Zilliz MCP server's only PyPI release dates from June 2025 and predates an August 2026 fix for token forwarding.

**Weaviate API + MCP.** Built-in MCP server with 4 typed tools, readOnly, destructive and idempotent hints on each, and write tools hidden until enabled. No public status page or incident history.

## Before you call either

### Milvus and Zilliz Cloud API + MCP

1. Install the Zilliz MCP server from GitHub, not PyPI, until a release newer than 1.0.0 ships
2. Use the cluster endpoint for data (`/v2/vectordb/entities/search`) and api.cloud.zilliz.com only for cluster management
3. Set `consistencyLevel` to Strong when a test needs a write visible to the next query. The default is Bounded
4. Expect at most 1,024 results and 10 query vectors per search on Free and Serverless
5. Return only the fields you need. Returning the vector field multiplies read cost

### Weaviate API + MCP

1. Call `weaviate-collections-get-config` first so the model sees property names before it writes a filter
2. `weaviate-query-hybrid` defaults `alpha` to 0.75, so lower it for keyword-heavy queries
3. Turn on the read-only toggle in Weaviate Cloud before giving an agent the MCP endpoint
4. Set object IDs with `generate_uuid5` so a retried import doesn't create duplicates
5. Free clusters hold one collection. Use tenants rather than extra collections

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