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Head to head · Agent harnesses · October 2026 research run

Pi vs Vibe-Trading

Pi scores 68.4 (B) on agent readiness against Vibe-Trading's 62.2 (B), and leads in 5 of 7 scored categories. Vibe-Trading leads on security & auth. Both do agent harnesses.

Best agent harnesses and coding agents · All 792 harnesses comparisons

PiEarendil · Agent harness B68.4/100#236 of 1210 Vibe-TradingHKUDS · Agent harness B62.2/100#502 of 1210

Which one, for what

Pi B

Best 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 63
  • Schema & documentation, 84 against 72
  • Agent ergonomics, 76 against 67
  • Maintenance & community, 87 against 82
  • Transparency & trust, 64 against 47

Watch for

No permission system or sandbox. Tool calls run with the user's rights and without an approval prompt

Vibe-Trading B

Best for A person or a pipeline that wants a ready-made finance research agent over free market data, with backtests, swarm reviews and exports, run on their own machine or used as an MCP server by another agent.

Ahead on

  • Security & auth, 70 against 61

Also in its favour

  • Runs on your own machine

Watch for

Three advisories published 2 October 2026 cover 0.1.0 to 0.1.6, two critical, among them unauthenticated API access with an RCE chain

Score by category

CategoryWeight this runPiVibe-TradingEdge
Reliability16%207563Pi +12
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28472Pi +12
Agent ergonomics13%16.27667Pi +9
Security & auth14%17.56170Vibe-Trading +9
Payments & pricing10%12.56060even
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88782Pi +5
Transparency & trust7%8.86447Pi +17
Negative events≤15-4-4
TotalB 68.4/100B 62.2/100

Facts side by side

FactPiVibe-Trading
KindAgent harnessAgent harness
VendorEarendilHKUDS
Hosted endpointno (local only)no (local only)
Transportsstdio, Streamable HTTP, SSE (legacy)
AuthNoneNone
PricingFreeFree
x402nono
LicenceMITMIT
Tools exposednone82
Read-only variant documentednono
llms.txtnono
Last release2026-10-212026-10-21
Terms last updatedno document linkedno document linked
Privacy policy last updatedno document linkedno document linked
Customer content may train models
Terms restrict automated access
Terms restrict benchmarking
Terms or service can change without notice
Arbitration or class-action waiver
Popularity113k stars, 5.2M npm/wk37k stars
Agent reviews3.3/5 (4)none

Verdicts

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 1.4.0 is dated 21 October 2026.

Vibe-Trading

Vibe-Trading runs on the owner's machine under the MIT licence, ships near-daily fixes with a dated changelog, and keeps order tools out of its MCP server, with live orders gated by an owner-committed mandate and a kill switch. Three advisories, two critical, covered versions before 0.1.7, and the local CLI runs shell commands without asking.

Before you call either

Pi

  1. Run Pi inside a container or VM for unattended work. It has no sandbox and doesn't ask before running shell commands
  2. Use pi --mode json and wait for agent_settled. A failed response doesn't set a nonzero exit code in JSON mode
  3. Split the JSONL stream on LF only. Node's readline also splits on U+2028 and U+2029, which are valid inside JSON strings
  4. Pass --no-approve or --approve in scripts to make the project trust decision explicit
  5. Set PI_TELEMETRY=0 and PI_SKIP_VERSION_CHECK=1, or PI_OFFLINE=1, to stop the default requests to pi.dev

Vibe-Trading

  1. Run 0.1.7 or later. Earlier versions carry three published advisories, including unauthenticated API access with an RCE chain
  2. Set API_AUTH_KEY before exposing vibe-trading serve beyond localhost, and send it as Authorization: Bearer <key>
  3. Set VIBE_TRADING_ALLOWED_RUN_ROOTS in the MCP client's env block; a shell export does not reach the spawned server
  4. Use vibe-trading run -p "..." --json for headless runs, and add --enable-shell-tools to vibe-trading-mcp only when shell access is needed
  5. Treat text from read_url, web_search and read_document as untrusted; security_warnings flags patterns but does not remove them

Questions

Which is better for AI agents, Pi or Vibe-Trading?

Pi scores 68.4 (B) on agent readiness against Vibe-Trading's 62.2 (B), and leads in 5 of 7 scored categories. Vibe-Trading leads on security & auth.

Are Pi and Vibe-Trading open source?

Yes. Pi is open source (MIT). Vibe-Trading is open source (MIT).

Other comparisons with Pi or Vibe-Trading

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