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What are Agent Skills?

The sixtyfour-ai/skills repo packages Sixtyfour as an Agent Skill — a single directory of instructions that teaches an AI coding assistant how to use the Sixtyfour API correctly.

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Prerequisites

  1. Have an AI coding assistant installed (Claude Code, Cursor, etc.).
  2. Sign up at app.sixtyfour.ai.
  3. Generate a key by following Get an API Key.
  4. Set SIXTYFOUR_API_KEY in your agent’s shell.
export SIXTYFOUR_API_KEY=YOUR_API_KEY

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Install

The Sixtyfour Agent Skills are not yet available in the Cursor and Claude Code marketplaces. For now, follow the instructions below to install manually.
npx skills add sixtyfour-ai/skills --skill "sixtyfour"
After cloning into Cursor, open the Command Palette (Cmd+Shift+P on macOS, Ctrl+Shift+P on Windows/Linux) and run Developer: Reload Window. Then open Cursor Settings → Plugins and confirm Sixtyfour appears with a Local badge and 1 skill.

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Usage

Once installed, your agent can:
  • Investigate people — “Tell me everything about Jane Doe at Acme Corp — title, background, LinkedIn, career trajectory”
  • Research companies — “Research Ramp — revenue, headcount, funding, engineering leadership”
  • Search at scale — “Find 500 VPs of Sales at Series B SaaS startups in NYC”
  • Build pipelines — “Search for AI startups, find their CTOs, get contact info, and export to CSV”
  • Due diligence — “Deep investigation on this person for compliance review” (medium/high tier)

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Troubleshooting

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API key not set

Check that the variable is exported in the same shell your agent runs in: 
[ -n "$SIXTYFOUR_API_KEY" ] && echo "set" || echo "not set"
If it’s not set, generate a key at app.sixtyfour.ai/keys and export it in the terminal that your agent runs in: 
export SIXTYFOUR_API_KEY=YOUR_API_KEY
Setting the variable in a different terminal window does not carry over.

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Environment variables don’t persist in Cursor or VS Code

Cursor and VS Code don’t always inherit shell environment variables — especially on macOS when launched from the Dock or Spotlight. Fix it one of three ways:
  • Launch from a terminal that already has the variable set: cursor .
  • Add the export to ~/.zshrc or ~/.bashrc so it’s always available
  • Add it to .claude/settings.json under env

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Locating poll_job.py

The polling script ships inside the skill’s plugin cache. The agent knows where to find it, but if you need to run it manually: 
~/.claude/plugins/cache/sixtyfour-skills/sixtyfour/<version>/skills/sixtyfour/scripts/poll_job.py
Run it from that directory or pass the full path. It requires Python 3 and uses only the standard library.

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429: too many concurrent searches

Deep search allows a maximum of 5 concurrent searches per org. If you hit a 429, wait for running searches to finish before starting new ones. Check the status of previous tasks with GET /search/status/{task_id}.

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403 on high tier requests

The high research tier requires enterprise access. If you get a 403, book a call at cal.com/team/sixtyfour/discovery. The low and medium tiers work on all plans.

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Results are empty or incomplete

  • Bump tier from "low" to "medium". The default single-pass lookup misses people with limited online presence or common names.
  • For people intelligence, pass as many identifiers as possible in lead_info: full_name, company, linkedin_url, and email all improve matching.

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Deep search appears stuck

Searches take 30–120+ seconds while the agent runs. The poll_job.py script prints progress messages like Analyzing your query... and Found X profiles as it goes. Don’t kill it early. If it hangs past 10 minutes, re-run with a fresh start-deep-search call.

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Output file is CSV, not JSON

Deep search results download as CSV. Parse them with csv.DictReader, not json.load. Columns include fullName, currentPosition, currentCompany, linkedinUrl, skills, locationName, and others.

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Signed download URLs expire

After a search completes, the download URL expires in 15 minutes. If you wait too long, re-poll the status endpoint — it issues a fresh resource_handle_id you can use to get a new signed URL.