# subscribe

Create a proactive monitoring subscription to a live-data event stream. Returns the new subscription id. Requires a Pipeworx OAuth account (anonymous + BYO cannot persist subscriptions). Supported types: "sec_8k" (8-K filings matching ticker + item codes — e.g. items:["5.02"] = officer change), "polymarket_edge" (Polymarket↔Kalshi cross-venue mispricings — params:{topic:"fed"}), "fred_series" (new FRED observations — params:{series_id:"UNRATE"}). Delivery channels: feed (always on — pull via recent_alerts or GET registry.pipeworx.io/alerts.json), and optionally email (set delivery:{email:"you@x.com"}) or sms (delivery:{sms:"+15551234567"} — phone must be verified at /account first; 10/day cap).

Agent View of the PolicyLayer registry record for `subscribe`. HTML page: https://policylayer.com/tools/io-github-pipeworx-io-linear/subscribe

## Facts

- Tool: `subscribe`
- Server: Linear (`https://gateway.pipeworx.io/linear/mcp`) — https://policylayer.com/tools/io-github-pipeworx-io-linear.md
- Homepage: https://github.com/pipeworx-io/mcp-linear
- Risk category: Write (Medium risk)
- Registry record: grade F, identity unverified
- Server auth posture: open
- Server CORS policy: *
- Server rate-limited: yes
- Parameters: 3 (2 required)
- Recommended policy verdict: Rate-limited

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `type` | string | yes | Subscription type. |
| `params` | object | yes | Type-specific filter. sec_8k: {ticker:"AAPL", items?:["5.02","1.01"]}. polymarket_edge: {topic:"fed", min_spread_bps?:500}. fred_series: {series_id:"UNRATE"}. p |
| `delivery` | object | no | Optional delivery channels in addition to the always-on persistent feed. {email:"you@x.com"} sends a templated alert per fired event. {sms:"+15551234567"} sends |

Parameters from the server's own tool schema.

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "subscribe",
    "arguments": {
      "type": "<type>",
      "params": {}
    }
  }
}
```

## Why subscribe is rated Medium

This tool creates and modifies subscription records—a reversible write operation. It does not execute queries, delete data, or move money. The severity is medium because misuse could create unwanted subscriptions consuming resources or enabling information exfiltration via email delivery of sensitive market data (8-K filings, mispricings), but subscriptions can be deleted/modified later.

From the tool's own definition: "Tool creates a 'proactive monitoring subscription' that returns a 'new subscription id', persisting state in a user's account."

Risk signals: Accepts URL/endpoint input (delivery.webhook)

## Use case

AI agents use subscribe to create or update resources in Linear, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Linear environment.

## Recommended policy (PolicyLayer)

Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Linear:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "subscribe": {
      "limits": [
        {
          "counter": "subscribe_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on Linear (35)

- `forget` — Destructive — https://policylayer.com/tools/io-github-pipeworx-io-linear/forget.md
- `generate_llms_txt` — Execute — https://policylayer.com/tools/io-github-pipeworx-io-linear/generate-llms-txt.md
- `polymarket_edges` — Financial — https://policylayer.com/tools/io-github-pipeworx-io-linear/polymarket-edges.md
- `polymarket_fill_risk` — Financial — https://policylayer.com/tools/io-github-pipeworx-io-linear/polymarket-fill-risk.md
- `ai_visibility_check` — Read — https://policylayer.com/tools/io-github-pipeworx-io-linear/ai-visibility-check.md
- `ask_pipeworx` — Read — https://policylayer.com/tools/io-github-pipeworx-io-linear/ask-pipeworx.md
- `ask_pipeworx_beta` — Read — https://policylayer.com/tools/io-github-pipeworx-io-linear/ask-pipeworx-beta.md
- `ask_pipeworx_grounded` — Read — https://policylayer.com/tools/io-github-pipeworx-io-linear/ask-pipeworx-grounded.md
- `bet_research` — Read — https://policylayer.com/tools/io-github-pipeworx-io-linear/bet-research.md
- `compare_entities` — Read — https://policylayer.com/tools/io-github-pipeworx-io-linear/compare-entities.md
- `deep_research` — Read — https://policylayer.com/tools/io-github-pipeworx-io-linear/deep-research.md
- `discover_tools` — Read — https://policylayer.com/tools/io-github-pipeworx-io-linear/discover-tools.md
- `entity_profile` — Read — https://policylayer.com/tools/io-github-pipeworx-io-linear/entity-profile.md
- `linear_get_issue` — Read — https://policylayer.com/tools/io-github-pipeworx-io-linear/linear-get-issue.md
- `linear_list_issues` — Read — https://policylayer.com/tools/io-github-pipeworx-io-linear/linear-list-issues.md
- `linear_list_teams` — Read — https://policylayer.com/tools/io-github-pipeworx-io-linear/linear-list-teams.md
- `linear_search` — Read — https://policylayer.com/tools/io-github-pipeworx-io-linear/linear-search.md
- `list_subscriptions` — Read — https://policylayer.com/tools/io-github-pipeworx-io-linear/list-subscriptions.md
- `pipeworx_trending` — Read — https://policylayer.com/tools/io-github-pipeworx-io-linear/pipeworx-trending.md
- `polymarket_arbitrage` — Read — https://policylayer.com/tools/io-github-pipeworx-io-linear/polymarket-arbitrage.md
- `polymarket_edge_tracker` — Read — https://policylayer.com/tools/io-github-pipeworx-io-linear/polymarket-edge-tracker.md
- `polymarket_kalshi_spread` — Read — https://policylayer.com/tools/io-github-pipeworx-io-linear/polymarket-kalshi-spread.md
- `recall` — Read — https://policylayer.com/tools/io-github-pipeworx-io-linear/recall.md
- `recent_alerts` — Read — https://policylayer.com/tools/io-github-pipeworx-io-linear/recent-alerts.md
- `recent_changes` — Read — https://policylayer.com/tools/io-github-pipeworx-io-linear/recent-changes.md
- `resolve_entity` — Read — https://policylayer.com/tools/io-github-pipeworx-io-linear/resolve-entity.md
- `scan_competitor_ai_presence` — Read — https://policylayer.com/tools/io-github-pipeworx-io-linear/scan-competitor-ai-presence.md
- `scan_dependency` — Read — https://policylayer.com/tools/io-github-pipeworx-io-linear/scan-dependency.md
- `search_within` — Read — https://policylayer.com/tools/io-github-pipeworx-io-linear/search-within.md
- `suggest_questions` — Read — https://policylayer.com/tools/io-github-pipeworx-io-linear/suggest-questions.md
- …and 5 more: https://policylayer.com/tools/io-github-pipeworx-io-linear.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=io-github-pipeworx-io-linear · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/io-github-pipeworx-io-linear