Bug: Qdrant collection created with wrong vector dimension when using Ollama embeddings

Environment

• OpenClaw: 2026.2.26 (bc50708)
• Plugin: openclaw-mem0
• Embedding model: nomic-embed-text (via Ollama)
• Vector store: Qdrant 1.17.0
• Qdrant JS client: @qdrant/js-client-rest 1.13.0 → 1.17.0 (manually upgraded)

Problem

When using openclaw mem0 search, the command fails with:

Search failed: Error: Bad Request

The root cause is that mem0ai/dist/oss/index.js hardcodes 1536 as the default vector dimension in multiple places:

this.embeddingDims = config.embeddingDims || 1536;
this.dimension = config.dimension || 1536;
const testVector = Array(1536).fill(0);
dimension: 1536  // line 3690, not overridable via config

1536 is the dimension for OpenAI's text-embedding-ada-002, but nomic-embed-text outputs 768-dimensional vectors. This mismatch causes Qdrant to reject search requests with Bad Request.

Additionally, @qdrant/js-client-rest@1.13.0 (bundled) is incompatible with Qdrant server 1.17.0, which requires a manual upgrade of the client.

Steps to Reproduce

1. Install openclaw-mem0 plugin
2. Configure Qdrant as vector store with nomic-embed-text as embedding model
3. Run openclaw mem0 search "anything"
4. → Search failed: Error: Bad Request

Root Cause

mem0ai was originally designed around OpenAI embeddings (1536 dims). When Ollama support was added, the default dimension was never updated to match models like nomic-embed-text (768 dims).

Workaround

Manually patch node_modules/mem0ai/dist/oss/index.js:

sed -i '' 's/config.embeddingDims || 1536/config.embeddingDims || 768/g' ~/.openclaw/extensions/openclaw-mem0/node_modules/mem0ai/dist/oss/index.js
sed -i '' 's/config.dimension || 1536/config.dimension || 768/g' ~/.openclaw/extensions/openclaw-mem0/node_modules/mem0ai/dist/oss/index.js
sed -i '' 's/Array(1536).fill(0)/Array(768).fill(0)/g' ~/.openclaw/extensions/openclaw-mem0/node_modules/mem0ai/dist/oss/index.js
sed -i '' 's/vector(1536)/vector(768)/g' ~/.openclaw/extensions/openclaw-mem0/node_modules/mem0ai/dist/oss/index.js
sed -i '' 's/dimension: 1536/dimension: 768/g' ~/.openclaw/extensions/openclaw-mem0/node_modules/mem0ai/dist/oss/index.js

Then delete and recreate the Qdrant collection:

curl -X DELETE "http://<qdrant-host>:6333/collections/memories"

Expected Behavior

• The default embedding dimension should be dynamically inferred from the configured embedding model, not hardcoded to 1536.
• Alternatively, config.dimension should override all hardcoded values including line 3690.
• The bundled @qdrant/js-client-rest version should be kept in sync with recent Qdrant server releases.

Suggested Fix

// Detect dimension from embedding model instead of hardcoding
const embeddingDims = config.embeddingDims ?? (await this.getEmbeddingDimension());

Or at minimum, document the required embeddingDims config value clearly when using non-OpenAI embedding models.