Signl exposes 30 MCP tools: everything you do day to day, from a conversation. Your agent calls them by name; you do not, but knowing what each does is the fastest way to phrase a request it can answer. Every tool is free to call, on every plan. Signl is priced by the sources you watch, with everyone a source finds and their verified emails included, and no credits: see how plans and fair use work.
Anything irreversible or outbound (sending people, removing a source, deleting an autopilot rule, recording a person's objection) is confirmed with you first. Credentials you paste (an API key for HeyReach, a Clay webhook URL) are stored server-side, never repeated back, and never kept in Signl's own call log.
The tools at a glance
Inbox: get_inbox (with new_only, who engaged since you last asked; otherwise everyone, filterable; ranked by priority, with intent, a reason and an opener), get_person (one person in full, by id, LinkedIn or X URL, or email), edit_opener, dismiss_people (with an optional reason the ranking learns from), restore_people, mark_contacted.
Companies (Pro plan): list_companies (the Inbox grouped by company, with each company's roles, the roles your ICP sells to that nobody there holds yet, and a score) and get_company (everyone from one company and what each said, newest first; send them together with send_people).
Market (Pro plan): get_market_brief (the weekly brief from your ICP people's comments: themes with quotes, pains, objections, competitors named and the exact phrases buyers used) and get_competitor_radar (mentions of the competitors on your ICP per week, share of voice against your own name, spikes, and people unhappy with a competitor who showed a need).
Sources: watch_posts (a LinkedIn profile or post, a topic or company search, an X account or search; lead magnets too), import_from_trigify (moves your Trigify profiles and searches in from an export or a pasted list), suggest_sources (authors whose posts draw your ICP people and phrases they keep using, each with the reason and the people behind it), list_watches (every source, with what its people led to: replies, meetings, deals), update_source (pause, resume, rename, author, lead magnet, reactions, search words), stop_watching (removes).
Outreach tools: list_destinations, connect_destination (with a key or URL you paste; replies and outcomes come back), list_campaigns, send_people.
Autopilot: get_autopilot, set_autopilot, delete_autopilot.
Who you sell to: get_icp (with the values it accepts), analyse_website, update_icp.
Account: get_account (plan, sources used, this month's likers and verified emails, connected tools, ICP, sources, Inbox counts, what the ranking has learned and recent activity, in one call), get_pipeline_report (what Signl made you: replies, meetings, deals and their value, by month and by source; Pro plan), get_upgrade_link (a checkout link for a plan: want is starter, pro or manage for the billing portal, and interval is month or year, with yearly 20% off).
Privacy: record_objection: when a person asks not to be contacted, they are suppressed and erased everywhere. Global and permanent; the agent always confirms first.
Kept in the Signl app
Creating and revoking API keys, Slack alerts, and disconnecting a tool are done in Settings, not by your agent. Each one either grants access to your account or stops something that is running, so it should be a decision you make on screen.