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by signal8ai
Signal8 MCP Server - SEC filing intelligence for AI agents
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signal8-mcp is an open-source ai agents skill for AI coding assistants such as Claude Code, Codex CLI, and ChatGPT, built by signal8ai. Signal8 MCP Server - SEC filing intelligence for AI agents. It has 336 GitHub stars.
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Clone the repository with "git clone https://github.com/signal8ai/signal8-mcp" and add it to your Claude Code skills directory (see the Installation section above).
signal8-mcp is primarily written in TypeScript. It is open-source under signal8ai on GitHub, so you can review or fork the full source.
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Signal8 MCP server for SEC EDGAR filings, Form 4 insider trades, 13F institutional holdings, congressional STOCK Act trades and dilution data. It gives Claude, Cursor and any other Model Context Protocol client 113 read-only tools over the Signal8 API.
https://mcp.signal8.ai/mcp (Streamable HTTP, API key or OAuth sign-in)npx -y @signal8ai/mcp (stdio)ai.signal8/mcp in the official MCP RegistryWhat works without an API key: the three Signal8 Academy tools,
search_learn_guides, get_learn_guide and define_term (plain-English guides
to dilution, SEC filings and market structure, plus a glossary), and the
signal8://learn resources. On the local server they work with
SIGNAL8_API_KEY unset. On the hosted server they need a signed-in Signal8
account, which can be a free one.
What needs Signal8 Pro: every other tool. API and MCP access are included
with Signal8 Pro ($59/mo or $588/yr): 120 requests per minute, 10,000 requests
per day, up to 3 API keys, no per-call charges. Upgrade at
signal8.ai/pro and create a key at
signal8.ai/developer/api-keys. Without a
key the server still starts and lists its tools; calls to the other tools
return an API_KEY_REQUIRED error.
Settings > Connectors > Add custom connector, paste https://mcp.signal8.ai/mcp,
then sign in with your Signal8 account when Claude asks.
Add to claude_desktop_config.json
(macOS: ~/Library/Application Support/Claude/claude_desktop_config.json,
Windows: %APPDATA%\Claude\claude_desktop_config.json):
{
"mcpServers": {
"signal8": {
"command": "npx",
"args": ["-y", "@signal8ai/mcp"],
"env": {
"SIGNAL8_API_KEY": "sk_live_your_key_here"
}
}
}
}
Leave out the env block to use only the Academy tools.
Hosted server, sign in with OAuth (run /mcp in Claude Code to authenticate):
claude mcp add --transport http signal8 https://mcp.signal8.ai/mcp
Hosted server with an API key:
claude mcp add --transport http signal8 https://mcp.signal8.ai/mcp \
--header "Authorization: Bearer sk_live_your_key_here"
Local server:
claude mcp add signal8 -e SIGNAL8_API_KEY=sk_live_your_key_here -- npx -y @signal8ai/mcp
Add to .cursor/mcp.json in your project (or ~/.cursor/mcp.json for all projects).
Hosted:
{
"mcpServers": {
"signal8": {
"url": "https://mcp.signal8.ai/mcp",
"headers": {
"Authorization": "Bearer sk_live_your_key_here"
}
}
}
}
Local:
{
"mcpServers": {
"signal8": {
"command": "npx",
"args": ["-y", "@signal8ai/mcp"],
"env": {
"SIGNAL8_API_KEY": "sk_live_your_key_here"
}
}
}
}
SIGNAL8_API_KEY=sk_live_your_key_here npx -y @signal8ai/mcp
or point a Streamable HTTP client at https://mcp.signal8.ai/mcp with
Authorization: Bearer sk_live_....
This table lists every tool the server registers. Each tool's full input schema
and description are returned by tools/list.
| Tool | What it returns | Needs a Pro API key |
|---|---|---|
search_sec_filings |
Search SEC filings by company, form type, date range, 8-K item codes, with optional full-text query | Yes |
screen_sec_filings |
Screen filings across all companies by sector, industry, market cap, exchange, form type and date | Yes |
search_filing_text |
Full-text search over filing content, returning the matching passage per filing | Yes |
lookup_accession_number |
Resolve a filing or exhibit from its SEC accession number | Yes |
get_filing_documents |
Every document in one filing (primary document, exhibits, XML, XBRL) with SEC URLs | Yes |
get_filing_document |
Full text of a filing | Yes |
get_filing_exhibits |
Readable exhibits within a filing | Yes |
get_exhibit_content |
Full text of one exhibit | Yes |
get_filing_structured |
Parsed Form 3/4/5, 13F-HR and Schedule 13D/G data by accession number | Yes |
get_recent_material_filings |
Material 8-Ks from the last 7 days for an index universe | Yes |
get_filing_calendar |
Upcoming 10-K / 10-Q filing deadlines | Yes |
screen_sec_filings_performance |
Stock price returns after filings | Yes |
| Tool | What it returns | Needs a Pro API key |
|---|---|---|
get_insider_transactions |
Form 4 buy and sell history for a company | Yes |
get_insiders |
Insider activity for a company, including cluster-buy detection | Yes |
get_insider_cluster_buys |
Periods where 3+ insiders made open-market purchases within 14 days | Yes |
get_insider_positions |
Open insider positions for an insider or issuer CIK | Yes |
get_insider_positions_by_ticker |
Per-insider holdings, cost and value for a ticker | Yes |
get_insider_cross_company |
Insider patterns across all companies: multi-company insiders, clusters, large trades | Yes |
| Tool | What it returns | Needs a Pro API key |
|---|---|---|
get_institutions |
13F holders of a company | Yes |
get_ownership |
Combined Form 4, 13F and 13D/13G ownership breakdown for a company | Yes |
search_institutions |
Find 13F filers by name | Yes |
get_institution_detail |
Profile of one institution by CIK: name, AUM, holdings count | Yes |
get_institution_holdings |
Latest 13F portfolio of an institution | Yes |
get_institution_position_changes |
Quarter-over-quarter 13F diff for an institution | Yes |
get_institution_activity |
Position changes over recent 13F periods | Yes |
get_institution_filings |
List of an institution's 13F filings | Yes |
get_institution_derivatives |
Put and call positions reported on 13F | Yes |
get_institution_portfolio_analytics |
Sector allocation and top holdings of an institution | Yes |
get_institution_top_aum |
Largest institutions by AUM across all companies | Yes |
get_institutions_leaderboards |
Top institutions by AUM and by 13F position-change volume | Yes |
| Tool | What it returns | Needs a Pro API key |
|---|---|---|
get_politicians |
List and search members of Congress with STOCK Act disclosures | Yes |
get_politician_detail |
Profile, trade statistics and recent trades for one politician | Yes |
get_politician_transactions |
Trade history for one politician | Yes |
get_politician_recent_trades |
Latest STOCK Act trades across all politicians | Yes |
get_politician_disclosures |
Per-report feed of congressional PTRs and executive-branch OGE 278-T filings | Yes |
get_senate_trades_by_ticker |
Which politicians recently traded a ticker | Yes |
get_politician_activity |
Buy and sell counts and values by period for one politician | Yes |
get_politicians_most_active |
Most active congressional traders in a lookback window | Yes |
get_politician_late_filers |
Trades disclosed more than 45 days after the transaction | Yes |
get_politician_pnl |
Estimated realized and unrealized P&L for one politician | Yes |
get_politicians_pnl_leaderboard |
Politicians ranked by estimated trading P&L | Yes |
get_politician_scorecard |
Top and bottom 5 politicians by estimated 90-day P&L, with SPY as benchmark | Yes |
get_political_sector_rotation |
Sectors politicians have been trading over a trailing window | Yes |
get_politician_committees |
Committee and subcommittee assignments | Yes |
get_politician_roles |
Committee leadership roles | Yes |
get_politician_votes |
Voting record for one politician | Yes |
get_recent_congressional_votes |
Recent roll-call votes (GovTrack) | Yes |
get_recently_sponsored_bills |
Most recently introduced bills and their sponsors | Yes |
get_legislative_calendar |
Upcoming House and Senate floor votes that can affect listed companies | Yes |
get_policy_events |
Executive orders from the Federal Register | Yes |
get_policy_trade_overlap |
A politician's trades near executive orders affecting the traded sector | Yes |
get_policy_trade_leaderboard |
Politicians ranked by trades near executive-order signings | Yes |
| Tool | What it returns | Needs a Pro API key |
|---|---|---|
get_politician_donors |
Individual and PAC donors to one politician for a cycle | Yes |
get_politician_donor_summary |
Cycle totals plus top 10 individual and PAC donors | Yes |
get_donor_aggregates |
Market-wide campaign-finance rollups for a cycle | Yes |
| Tool | What it returns | Needs a Pro API key |
|---|---|---|
get_dilution_coverage |
Whether Signal8 holds a dilution analysis for a company, and how current it is | Yes |
get_dilution_risk |
Dilution pressure score (0-100) with a seven-component breakdown and risk levels | Yes |
get_dilution_snapshot |
Dilution summary: poten |