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MCP Bluesky Stock Sentiment

MCP Bluesky Stock Sentiment

by Tar-ive
OverviewSchemaSourceRelated ServersDiscussionsAdmin
TypeScript
Hybrid

MCP Bluesky Stock Sentiment

An MCP server on Cloudflare Workers that pulls recent stock-related posts from Bluesky, scores their sentiment with Workers AI, and returns a concise summary to any MCP-compatible client.

🏅 3rd place at World Wild Web MCP Server Hack Night — built with Cloudflare and Fiberplane. (announcement)

Claude calling analyze_stock_posts through the MCP server

How it works

Architecture: MCP client → Cloudflare Worker → analyze_stock_posts → Bluesky search, stock filter, Workers AI

  1. An MCP client (e.g. Claude Desktop) calls the analyze_stock_posts tool over HTTP at /mcp.

  2. The Worker (Hono + mcp-lite) searches Bluesky's public API for recent posts.

  3. Posts are filtered down to stock-related content with keyword/regex heuristics.

  4. Each post is classified by Workers AI (@cf/huggingface/distilbert-sst-2-int8).

  5. The tool returns totals, percentages, average confidence, and per-post details.

The Mermaid source for the diagram lives in docs/architecture.md.

Related MCP server: Yahoo Finance MCP Server

Quickstart

Prerequisites: Node 18+, a Cloudflare account, and Wrangler auth (npx wrangler login).

npm install
npm run dev          # http://localhost:8787
npm run deploy       # deploy to Cloudflare Workers
npm run cf-typegen   # optional: regenerate Worker binding types

Workers AI is already bound in wrangler.jsonc (ai.binding = "AI").

Connecting a client

Environment

MCP endpoint

Local

http://localhost:8787/mcp

Production

https://<your-subdomain>.workers.dev/mcp

The server registers as bluesky-stock-sentiment. Example prompt:

Use the analyze_stock_posts tool to get recent stock posts from Bluesky and analyze their sentiment.

Tool reference

analyze_stock_posts

Input

Type

Default

Description

count

number (1–10)

2

Number of recent stock posts to analyze

Returns a text summary: positive/negative counts and percentages, average confidence, and for each post the label, confidence, author, likes, reposts, timestamp, and URI.

HTTP endpoints

Method

Path

Description

GET

/

Service metadata (name, version, description, tools)

ALL

/mcp

MCP over HTTP (mcp-lite)

Customizing

What

Where

Notes

Sentiment model

src/lib/sentiment.ts

Swap for any Workers AI text-classification model

Stock keywords

src/lib/stock-filter.ts

Tune what counts as a "stock post"

Bluesky search

src/lib/bluesky-api.ts

Public unauthenticated search with de-duplication

Firehose (reference)

src/lib/firehose.ts

Real-time WebSocket collector; not wired into the Worker

Project layout

src/
├── index.ts          # Hono app, MCP server wiring, routes
├── mcp/tools.ts      # analyze_stock_posts registration + handler
└── lib/              # sentiment, stock filter, Bluesky search, firehose
docs/
├── architecture.md   # Mermaid architecture diagram
└── images/           # README screenshots

Notes

  • Bluesky's public search API may rate-limit or change; results vary over time.

  • Sentiment output is a toy signal, not financial advice.

Built at

World Wild Web MCP Server Hack Night

License

Provided as-is; add a license if you plan to distribute.

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

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