The agent harness performance optimization system. Skills, instincts, memory, security, and research-first development for Claude Code, Codex, Opencode, Cursor and beyond.
Placecall
The phone is your last API. Give your agent a voice to call any US business - reservations, inquiries, quotes. Verified outcome + transcript. First 250 calls free.
Install
claude mcp add --transport http --scope user placecall https://api.voygr.tech/mcpInstall command taken from the project's README or registry entry. Always review code before running it.
README excerpt
Read full README on GitHub →PlaceCall ☎️
The internet has APIs. The real world has phone numbers.
Give your agent a voice to call any US business, handle reservations, gather information, get quotes. Handles IVRs & hold. Returns outcome + transcript. First 250 calls free.
curl -s -X POST https://api.voygr.tech/calls \
-H "X-API-Key: $PLACECALL_API_KEY" -H "Content-Type: application/json" \
-H "X-Client-Surface: gh-repo" \
-H "X-Client-Agent: ${CLAUDECODE:+claude-code}${CURSOR_AGENT:+cursor}${CODEX_SANDBOX:+codex}${GEMINI_CLI:+gemini-cli}" \
-d '{"target_phone":"+1XXXXXXXXXX","brief":"Call this restaurant and ask what time the kitchen closes tonight.","language":"en"}'
Authentication: the plugins and MCP connectors below sign you in in a
browser, so there is no key to copy. The raw API, as above, takes your key in
the X-API-Key header. Get one at https://api.voygr.tech/checkout - it
arrives by email.
What PlaceCall does
Give PlaceCall a US number (or a list) and a task in plain English - from making an inquiry to requesting a quote or completing a booking - and it dials, navigates IVRs and hold, talks to a business, and returns a verified outcome + transcript + recording.
No number? Just describe the place: "a romantic restaurant in Chicago, Saturday 8pm". PlaceCall finds candidates, explains why it picked them, and writes the call brief for you.
Put the full job in the brief - what to ask, who it's for, names, dates, party size, callback number, and desired outcome. The agent reads the brief, then gets things done. If necessary - agents will ask questions mid-call.
What your agents can finally do
- 🍽️ Book / cancel / reschedule tables and appointments
- 📦 Verify info, follow up on orders, check stock, get quotes
- ⚡️ Contact many businesses at once
- 📍 Recommend the best venue, service, or vendor when you don't have a number
- ✅ Report exactly what happened, raise a question mid-call if needed
What you get back
Every call returns one of 17 verified outcomes, plus the full transcript and recording - including clear failure reasons like dropped calls, busy lines, voicemail, or wrong numbers.
Why developers use PlaceCall
Built for agents that need to get shit done. Built by developers who mapped the world - ex-Google Maps & Search team.
🎁 Your first 250 calls are on us.
If PlaceCall is useful, drop us a ⭐ - it helps a lot.
Install
The Claude Code, Codex and Cursor plugins carry the skill and the PlaceCall
MCP server (https://api.voygr.tech/mcp). You sign in once in a browser, and
your first sign-in creates a PlaceCall account with free credits, so no key to
copy. The claude.ai and ChatGPT connectors work the same way. The skill-only
routes (a copied skill, the Codex skill installer, OpenClaw) call the API with a
key instead, see Get a key. The Gemini CLI
extension carries the MCP server too, but sends it your key rather than signing
you in.
Signing in covers finding places, placing calls and following them. A few API options need a key on every route: switching off recording or changing the opening notice, cancelling a call, and listing your calls.
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