OpenRouter Agents MCP Server

OpenRouter Agents MCP Server

[MAJOR UPDATE – August 12, 2025] An intelligent MCP server that orchestrates GPT‑5 / Gemini / Claude agents to research in parallel, indexing as it goes (PGlite + vectors), then synthesizes consensus with strict, URL‑backed citations.

• Killer features
  • Plan → parallelize → synthesize workflow with bounded parallelism
  • Dynamic model catalog; supports Anthropic Sonnet‑4 and OpenAI GPT‑5 family
  • Built‑in semantic KB (PGlite + pgvector) with backup, export/import, health, and reindex tools
  • Lightweight web helpers: quick search and page fetch for context
  • Robust streaming (SSE), per‑connection auth, clean logs

What’s new (v1.2)

• Local hybrid indexer (BM25 + optional vector rerank) with MCP tools: index_texts, index_url, search_index.
• Auto‑indexing during research: every saved report and fetched page can be indexed on the fly.
• Prompt/resource registration (MCP): planning_prompt, synthesis_prompt, and mcp_spec_links.
• Compact prompts option: minimize tokens while enforcing explicit URL citations and confidence scoring.
• Planning model fallbacks and simplified routing per strategy.

Changelog →

Quick start

1. Prereqs

• Node 18+ (20 LTS recommended), npm, Git, OpenRouter API key

2. Install

3. Configure (.env)

4. Run

• STDIO (for Cursor/VS Code MCP):

• HTTP/SSE (local daemon):

Tools (high‑value)

• Research: conduct_research, research_follow_up
• Knowledge base: get_past_research, list_research_history, get_report_content
• DB ops: backup_db (tar.gz), export_reports, import_reports, db_health, reindex_vectors
• Models: list_models
• Web: search_web, fetch_url
• Indexer (new): index_texts, index_url, search_index, index_status

Notes

• Data lives locally under PGLITE_DATA_DIR (default ./researchAgentDB). Backups are tarballs in ./backups.
• Use list_models to discover current provider capabilities and ids.

Architecture at a glance

See docs/diagram-architecture.mmd (Mermaid). Render to SVG with Mermaid CLI if installed:

How it differs from typical “agent chains”:

• Not just hardcoded handoffs; the plan is computed, then parallel agents search, then a synthesis step reasons over consensus, contradictions, and gaps.
• The system indexes what it reads during research, so subsequent queries get faster/smarter.
• Guardrails shape attention: explicit URL citations, [Unverified] labelling, and confidence scoring.

Minimal‑token prompt strategy

• Compact mode strips preambles to essential constraints; everything else is inferred.
• Enforced rules: explicit URL citations, no guessing IDs/URLs, confidence labels.
• Short tool specs: use concise param names and rely on server defaults.

Common user journeys

• “Give me an executive briefing on MCP status as of July 2025.”
  • Server plans sub‑queries, fetches authoritative sources, synthesizes with citations.
  • Indexed outputs make related follow‑ups faster.
• “Find vision‑capable models and route images gracefully.”
  • /models discovered and filtered, router template generated, fallback to text models.
• “Compare orchestration patterns for bounded parallelism.”
  • Pulls OTel/Airflow/Temporal docs, produces a MECE synthesis and code pointers.

Cursor IDE usage

• Add this server in Cursor MCP settings pointing to node src/server/mcpServer.js --stdio.
• Use the new prompts (planning_prompt, synthesis_prompt) directly in Cursor to scaffold tasks.

FAQ (quick glance)

• How does it avoid hallucinations?
  • Strict citation rules, [Unverified] labels, retrieval of past work, on‑the‑fly indexing.
• Can I disable features?
  • Yes, via env flags listed above.
• Does it support streaming?
  • Yes, SSE for HTTP; stdio for MCP.

Command Map (quick reference)

• Start (stdio): npm run stdio
• Start (HTTP/SSE): npm start
• Generate examples: npm run gen:examples
• List models: MCP list_models { refresh:false }
• Research (compact): conduct_research { q:"<query>", cost:"low", aud:"intermediate", fmt:"report", src:true }
• Get past research: get_past_research { query:"<query>", limit:5 }
• Index URL (if enabled): index_url { url:"https://..." }
• Search index (if enabled): search_index { query:"<q>", limit:10 }