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Head to head · Assistant proactive · October 2026 research run

CowAgent vs Gemini Spark

CowAgent scores 58.5 (C) on agent readiness against Gemini Spark's 24.5 (F), and leads in 5 of 7 scored categories. Gemini Spark leads on security & auth. Both do assistant proactive.

Best AI personal assistants that act for one person · All 190 assistants comparisons

CowAgentzhayujie · Agent harness C58.5/100#591 of 986 Gemini SparkGoogle LLC · Platform F24.5/100#974 of 986

Which one, for what

CowAgent C

Best for One technical owner who wants an assistant on WeChat, Feishu, DingTalk, Telegram, Slack or Discord with memory in local files and a choice of Chinese and Western model providers.

Ahead on

  • Reliability, 84 against 14
  • Schema & documentation, 67 against 17
  • Agent ergonomics, 59 against 9
  • Payments & pricing, 60 against 10
  • Maintenance & community, 83 against 17

Also in its favour

  • Free to start without a card
  • Open source

Watch for

Source and Docker installs default to full-access, and no mode asks the owner before a shell command, a file send or an MCP call

Gemini Spark F

Best for A person who already keeps mail, calendar and files in a personal Google Account and accepts Keep Activity being on.

Ahead on

  • Security & auth, 60 against 43

Also in its favour

  • No incidents deducted, where CowAgent loses 5 points for them

Watch for

No public API, SDK or MCP server for an outside agent was found. Spark is reached in the Gemini mobile app, the Mac app and gemini.google.com

Score by category

CategoryWeight this runCowAgentGemini SparkEdge
Reliability16%208414CowAgent +70
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.26717CowAgent +50
Agent ergonomics13%16.2599CowAgent +50
Security & auth14%17.54360Gemini Spark +17
Payments & pricing10%12.56010CowAgent +50
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88317CowAgent +66
Transparency & trust7%8.84549Gemini Spark +4
Negative events≤15-50
TotalC 58.5/100F 24.5/100

Facts side by side

FactCowAgentGemini Spark
KindAgent harnessPlatform
VendorzhayujieGoogle LLC
Hosted endpointno (local only)no (local only)
TransportsHTTP
AuthOAuth or keyOAuth
PricingFreePaid
x402nono
LicenceMITProprietary hosted service under the Google Terms of Service
Read-only variant documentedyesno
llms.txtyesno
Last release2026-09-302026-05-19
Terms last updatedno document linked2026-07-30
Privacy policy last updatedno document linked2026-09-24
Customer content may train modelsyes, with an opt-out
Terms restrict automated accessyes
Terms restrict benchmarkingnot found in the text
Terms or service can change without noticenot found in the text
Arbitration or class-action waivernot found in the text
Popularity47k starsnone

Verdicts

CowAgent

MIT software with seven releases in 90 days, memory kept as plain files in the owner's workspace and three per-session permission modes. Source and Docker installs default to full-access, no action asks for approval, and an open report of 31 July 2026 says group members could reach the owner's files through the bot.

Gemini Spark

Google's help pages state what Spark confirms before doing, how to delete its remote browser and code data, and the risks of prompt injection. Spark has no public API, Google calls it experimental, and it runs only with Keep Activity on, the setting under which chats are used for model training and human review.

Before you call either

CowAgent

  1. Set agent_permission_mode to workspace-write or read-only before connecting any channel. Source and Docker installs default to full-access
  2. Keep the bot out of group chats that include other people. Any member who mentions it reaches the same tools as the owner
  3. Set web_password before changing web_host to 0.0.0.0. The password is empty by default
  4. Set external_api_token to enable POST /v1/chat/completions, and send conversation_id to keep one session. The model field does not select a model
  5. Run it in a container for a hard boundary. The docs and the source both say the permission modes are not isolation

Gemini Spark

  1. Do not plan an integration against Spark. No public API or MCP server was found, and a person must hold a Google AI Pro or Ultra subscription
  2. Expect a confirmation request before sends, edits, purchases and web form submissions, and note that bulk changes to private Google Tasks run without one
  3. Delete remote browser data and remote code execution data in Gemini Spark Settings after a sensitive session. Deleting a task thread or Gemini Apps activity does not remove them
  4. Keep within 15 running tasks and 50 active schedules. A schedule does not run when 15 tasks are running or the usage limit is reached
  5. Treat every safety statement here as Google's own description. None was tested, and no message was sent to the service

Questions

Which is better for AI agents, CowAgent or Gemini Spark?

CowAgent scores 58.5 (C) on agent readiness against Gemini Spark's 24.5 (F), and leads in 5 of 7 scored categories. Gemini Spark leads on security & auth.

Are CowAgent and Gemini Spark open source?

CowAgent is open source (MIT). No open-source release is listed for Gemini Spark.

Other comparisons with CowAgent or Gemini Spark

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