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Opensolr MCP server

by opensolr.com·com.opensolr/opensolr-mcp·v0.8.1
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Managed Apache Solr for agents: hybrid BM25+kNN search, server-side embeddings, RAG answers

B82/100grade B
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Safety scan
B82/100

full report

Adoption
Growing

0 stars498 downloads/wk

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If you have run it, two minutes of your experience saves the next person an afternoon.

Opensolr tools (16, 2 write)

write = sends, deletes, buys or posts

Read from the package source without running it. The installed server may list more.

  • opensolr_add_documents

    Index plain-text documents via the Opensolr Data Ingestion API.

  • opensolr_ai_answer

    Ask a question and get a grounded RAG answer generated ONLY from the content already indexed in the given Opensolr index. Retrieval runs through the platform's tuned hybrid pipeline (the index's saved Search Tuning applies automatically) — the top rag_docs hits (first rag_words words of text each) become the LLM context, the same pipeline as the hosted search UI. filter_query optionally narrows re

  • opensolr_apply_schema

    Install the Opensolr vector schema on an index of a vector region, so Data Ingestion, vector and hybrid search and PDF pages all work on it.

  • opensolr_check_schema

    Whether an index is ready for every Opensolr tool, and exactly why not.

  • opensolr_create_indexwrite action

    Create a new vector-enabled Opensolr index in a vector region. location: an environment id from opensolr_vector_regions, or a short name matched against that live list by environment id or country (e.g. "us", "de"). Additional dedicated regions can be deployed on request (support@opensolr.com).

  • opensolr_delete_documentswrite action

    Delete documents by ids (Solr ids or your original ids) or by a raw Solr query, e.g. 'meta_category:"drafts"' or '+id:"abc123"'.

  • opensolr_describe_image

    What a picture shows and what is written on it: "caption" (a sentence about what it depicts), "text" (the text read off it by OCR, empty if none), "labels" (the things in it) and "codes" (barcodes / QR codes). index is the Opensolr index the reading is counted on. Nothing is stored.

  • opensolr_extract_text

    Read local files on Opensolr without indexing them: their text, the text in their pictures (OCR, 100+ languages), a PDF page by page, scanned pages and picture files (JPG, PNG, TIFF...) included.

  • opensolr_index_files

    Index local files into an Opensolr index: one file or a whole folder.

  • opensolr_index_info

    Get connection details for an index: Solr URL, version, environment. (Credentials are intentionally not returned.)

  • opensolr_ingest_status

    Status of a Data Ingestion job (state, processed/success/failed doc counts). Also visible in the Opensolr Control Panel.

  • opensolr_list_indexes

    List all search indexes in the connected Opensolr account.

  • opensolr_read_document

    Read one indexed document in full — search results carry only an excerpt.

  • opensolr_search

    Search an Opensolr index and return the k most relevant documents.

  • opensolr_search_by_image

    Search an Opensolr index with a PHOTO instead of a text query.

  • opensolr_vector_regions

    List the vector-enabled Opensolr environments currently available (the servers with the Opensolr web crawler that are up, any Solr version: dense vectors, the hybrid query parser and Data Ingestion).

Public scan report

scanner v0.1.10 · 2026-10-15 · same rubric, same numbers if you re-run it

no findings
  • Code scan4 source files scanned25/25
  • –Live reliabilityno gateway calls yet and no remote to proben/a
  • –Tool poisoningtools not inspected (local package is not executed); not countedn/a
  • Auth qualitystatic API keys via environment variables6/15
  • Maintenancelast push 6 days ago15/15
  • Maintainer identitynamespace and repository owner differ; GitHub account older than a year; website matches verified namespace7/10
Overall 82/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Opensolr compares

Against every graded AI and agents MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
82/100
higher than 65% of 4,461 AI and agents servers
Tools
16
the typical AI and agents server has 6
Tools that change things
13%
typical: 0%. Fewer write tools means less an agent can break
Downloads a week
498
more than 87% of 1,554 AI and agents servers with a package

What its tools let an agent do: 16 create

Release history: 2 versions in the registry since 2026-09-07, latest 2026-10-09, typically one every 33 days.

Install Opensolr in Claude Code, Cursor or VS Code

claude mcp add opensolr-mcp -- uvx opensolr-mcp
Add to Cursor

What the publisher says

From the Opensolr repository's README, as published. We do not edit it. Read it on GitHub

opensolr-mcp

mcp-name: com.opensolr/opensolr-mcp

MCP (Model Context Protocol) server for Opensolr — gives any AI agent managed Apache Solr search as tools: hybrid (BM25 + kNN) retrieval, server-side GPU embeddings, document indexing, and grounded RAG answers.

See it live (real news index, hybrid + AI answer): https://search.opensolr.com/news__dense?q=how+am+I+supposed+to+save+money%3F

No embedding model to configure. No vector database to run. One API key.

Tools

Setup

Get a free Opensolr account (free forever, no card) at opensolr.com/register and copy your API key from Account.

Try it without an account

There is a public demo account. Point the package at it and everything in this README works immediately, with no signup:

export OPENSOLR_EMAIL=mcp@opensolr.com
export OPENSOLR_API_KEY=420b8b23e7b12dc8ab838932145a5065

mcpdemod1__dense is already loaded with 300 news articles, so search, filtering and grounded answers work the moment you connect. You also get the full write path: create your own index on the account, ingest into it, query it, delete it.

Know what you are working with:

or export. That includes indexes you created and every document in them.

  • Anything you create there is deleted after 3 days. Automatically, without warning

they can change or delete it, and you can do the same to theirs. Never put anything real, private or client-owned in it.

  • The account is shared with everyone reading this. Your index is visible to them,

of disk per index. Bandwidth is the one you will hit first: it covers a demo, a tutorial and a proof of concept, and it will not carry an application.

  • The limits are per index, and deliberately small. 200 MB of bandwidth and 50 MB

When you want an index that is private, yours and still there next week, get your own key — free forever, no card — and change the two variables above. Nothing else in your code changes.

Claude Desktop / Claude Code

{
  "mcpServers": {
    "opensolr": {
      "command": "uvx",
      "args": ["opensolr-mcp"],
      "env": {
        "OPENSOLR_EMAIL": "you@example.com",
        "OPENSOLR_API_KEY": "YOUR_OPENSOLR_API_KEY"
      }
    }
  }
}

Cursor / Windsurf / any MCP client

Same shape — stdio transport, command uvx opensolr-mcp (or pipx run opensolr-mcp), with OPENSOLREMAIL and OPENSOLRAPI_KEY in env.

Example agent session

You: Index our FAQ answers, then find everything about refunds.

The agent calls opensolradddocuments(index="faq__dense", texts=[...]),

then opensolrsearch(index="faqdense", query="refund policy", hybrid=True)

— BM25 catches the exact word "refund", kNN catches "giving customers their

money back", and the scores fuse per document.

Search with a photo

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

Opensolr: common questions

Is Opensolr MCP server safe?
Mostly: it is graded B (82/100). Read the Opensolr safety report
How do I install Opensolr?
It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
Does Opensolr need an API key?
Yes. The registry entry asks for OPENSOLR_API_KEY.
Is Opensolr maintained?
The last commit was 27 days ago (2026-10-09). The latest release is v0.8.1.
What can I use instead of Opensolr?
Servers from other publishers that do the same job: PDF MCP server, Local Rag MCP server and Butterbase AI MCP server.
How does Opensolr compare with other AI and agents MCP servers?
safety score 82/100 (higher than 65% of 4,461 AI and agents servers); tools 16 (the typical AI and agents server has 6); tools that change things 13% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.

Alternatives to Opensolr

Same job from other publishers: the closest match first, then the best rated.

  • PDF
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    A
  • Local Rag
    Easy-to-setup local RAG server with minimal configuration
    A
  • Butterbase AI
    Butterbase MCP server — manage your backend: schemas, auth, functions, storage, RAG, deploys.
    A
  • Alibaba Cloud DashScope — Qwen
    Alibaba Cloud DashScope MCP: Qwen chat, embeddings, and model discovery on your own account.
    B
  • Guaardvark
    Local AI studio on your GPU: images, video, music, voice, RAG. Needs the Guaardvark app installed.
    B