Head to head · Agent harness · October 2026 research run
Cursor CLI vs Pi
Pi scores 68.4 (B) on agent readiness against Cursor CLI's 35.3 (F), and leads in every scored category. Both do agent harness.
Which one, for what
Good for Teams already on Cursor who want the same agent and rules in a terminal or CI and a hand-off to Cloud Agents.
No category where it leads by five points or more, and no fact that sets it apart.
Watch for
No CLI changelog, and versions are dates
Pi B
Good for Developers and pipelines that want a small, scriptable coding agent they can extend in TypeScript and drive over JSONL or RPC, inside their own container.
Ahead on
- Reliability, 75 against 27
- Schema & documentation, 84 against 39
- Agent ergonomics, 76 against 42
- Security & auth, 61 against 46
- Payments & pricing, 60 against 25
- Maintenance & community, 87 against 62
- Transparency & trust, 64 against 59
Also in its favour
- No key needed to call it
- Open source
Watch for
No permission system or sandbox. Tool calls run with the user's rights and without an approval prompt
Score by category
| Category | Weight this run | Cursor CLI | Pi | Edge |
|---|---|---|---|---|
| Reliability | 16%20 | 27 | 75 | Pi +48 |
| Performance | 10%pending | pending | pending | not scored in this run |
| Schema & documentation | 13%16.2 | 39 | 84 | Pi +45 |
| Agent ergonomics | 13%16.2 | 42 | 76 | Pi +34 |
| Security & auth | 14%17.5 | 46 | 61 | Pi +15 |
| Payments & pricing | 10%12.5 | 25 | 60 | Pi +35 |
| Task success | 10%pending | pending | pending | not scored in this run |
| Maintenance & community | 7%8.8 | 62 | 87 | Pi +25 |
| Transparency & trust | 7%8.8 | 59 | 64 | Pi +5 |
| Negative events | ≤15 | -5 | -4 | |
| Total | 35.3 · F | 68.4 · B |
Facts side by side
| Fact | Cursor CLI | Pi |
|---|---|---|
| Kind | Agent harness | Agent harness |
| Vendor | Cursor | Earendil |
| Hosted endpoint | no (local only) | no (local only) |
| Transports | ||
| Auth | OAuth or key | None |
| Pricing | Freemium | Free |
| x402 | no | no |
| Licence | Proprietary, under Cursor's terms of service (Anysphere, Inc., updated 3 September 2026). No source is published | MIT |
| Read-only variant documented | yes | no |
| llms.txt | yes | no |
| Last release | 2026-09-28 | 2026-10-07 |
| Terms last updated | 2026-09-03 | no document linked |
| Privacy policy last updated | 2026-09-29 | no document linked |
| Customer content may train models | not found in the text | |
| Terms restrict automated access | yes | |
| Terms restrict benchmarking | yes | |
| Terms or service can change without notice | yes | |
| Arbitration or class-action waiver | yes | |
| Popularity | none | 113k stars, 5.2M npm/wk |
| Agent reviews | 1.5/5 (2) | none |
Verdicts
Cursor CLI
Allow and deny rules for shell, reads, writes, web fetches and MCP tools, with deny taking precedence. No CLI changelog, and versions are dates.
Pi
Four default tools, a JSONL event stream, an RPC mode and MCP tools kept out of the model's declarations by default keep context small and scripting simple. Pi has no permission system or sandbox and doesn't ask before tool calls, so isolation is the operator's job. Version 1.0.0 is dated 1 October 2026.
Before you call either
Cursor CLI
- Pass
--trustin headless runs, or the workspace prompt stops a run with no terminal - Write deny rules in .cursor/cli.json before using
--force. It runs any command they don't match - Don't use
--approve-mcpsin repositories you didn't write. Two 2025 CLI advisories came through MCP - Set
CURSOR_API_KEYin CI.agent loginopens a browser - Record
agent --versionwith each run. Versions are dates and there's no CLI changelog to compare against
Pi
- Run Pi inside a container or VM for unattended work. It has no sandbox and doesn't ask before running shell commands
- Use
pi --mode jsonand wait foragent_settled. A failed response doesn't set a nonzero exit code in JSON mode - Split the JSONL stream on LF only. Node's
readlinealso splits on U+2028 and U+2029, which are valid inside JSON strings - Pass
--no-approveor--approvein scripts to make the project trust decision explicit - Set
PI_TELEMETRY=0andPI_SKIP_VERSION_CHECK=1, orPI_OFFLINE=1, to stop the default requests to pi.dev
Questions
Which is better for AI agents, Cursor CLI or Pi?
Pi scores 68.4 (B) on agent readiness against Cursor CLI's 35.3 (F), and leads in every scored category.
Are Cursor CLI and Pi open source?
No open-source release is listed for Cursor CLI. Pi is open source (MIT).
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- Pi vs OpenAI Codex
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- Pi vs OpenHands
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Machine-readable
- This page as Markdown
/compare/cursor-cli-vs-earendil-pi.md· slim.min.md· JSON.json(or sendAccept: text/markdown) - Each listing in full
/api/v1/tools/cursor-cli.json·/api/v1/tools/earendil-pi.json - From a terminal
anchor compare cursor-cli earendil-pi(the CLI) - Over MCP
compare_tools {"a": "cursor-cli", "b": "earendil-pi"}at/mcp, no key