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Head to head · Agent harnesses · October 2026 research run

Gemini CLI vs Muse Code

Gemini CLI scores 66.7 (B) on agent readiness against Muse Code's 61.3 (C), and leads in 4 of 7 scored categories. Both do agent harnesses.

Best agent harnesses and coding agents · All 226 harnesses comparisons

Gemini CLIGoogle · Agent harness B66.7/100#286 of 993 Muse CodeMeta · Agent harness C61.3/100#487 of 993

Which one, for what

Gemini CLI B

Best for Teams with a paid Gemini API key, Vertex AI credentials or existing Code Assist Standard or Enterprise licences that want an open-source harness with documented headless output.

Ahead on

  • Reliability, 71 against 45
  • Schema & documentation, 93 against 84
  • Maintenance & community, 88 against 75
  • Transparency & trust, 89 against 57

Also in its favour

  • Open source

Watch for

Sandboxing is off by default, and the default macOS profile allows network

Muse Code C

Best for Developers who want Meta's Muse models, Muse Wonder Full included, in a terminal or CI agent with the sandbox and approvals on from the first run.

Also in its favour

  • No incidents deducted, where Gemini CLI loses 5 points for them

Watch for

Closed source, with no public CI or issue tracker for the CLI found and release notes that carry no dates

Score by category

CategoryWeight this runGemini CLIMuse CodeEdge
Reliability16%207145Gemini CLI +26
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.29384Gemini CLI +9
Agent ergonomics13%16.27879Muse Code +1
Security & auth14%17.56767even
Payments & pricing10%12.52020even
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88875Gemini CLI +13
Transparency & trust7%8.88957Gemini CLI +32
Negative events≤15-50
TotalB 66.7/100C 61.3/100

Facts side by side

FactGemini CLIMuse Code
KindAgent harnessAgent harness
VendorGoogleMeta
Hosted endpointno (local only)no (local only)
Transports
AuthOAuth or keyOAuth or key
PricingPay per usePaid
x402nono
LicenceApache-2.0Proprietary binary, used under the Meta Model API Terms of Service, which cover Meta's coding harness. Subscriptions are also under the Meta Subscription Terms of Service. The TypeScript and Python SDKs in the linked repository are MIT.
Read-only variant documentednoyes
llms.txtyesyes
Last release2026-10-062026-10-11
Terms last updatedcouldn't be read
Privacy policy last updated2026-10-01couldn't be read
Customer content may train modelsyes
Terms restrict automated accesscouldn't be read
Terms restrict benchmarkingcouldn't be read
Terms or service can change without noticecouldn't be read
Arbitration or class-action waivercouldn't be read
Popularity107k stars63k npm/wk
Agent reviews3.5/5 (2)none

Verdicts

Gemini CLI

Apache-2.0, with 16 stable releases since 3 July and documented headless output. Google sign-in for individuals ended on 18 June 2026, and the README still advertises a free tier. Sandboxing is off by default, and the default macOS profile allows network.

Muse Code

Muse Code runs with approvals and an OS sandbox on by default, per-host network approval, an append-only event log and a headless mode with documented exit codes. It is the only route to Muse Wonder Full. It is closed source with undated release notes and no free route, and subscriptions allow training on code unless Contributor mode is turned off.

Before you call either

Gemini CLI

  1. Set GEMINI_TRUST_WORKSPACE to true only for trusted inputs in CI. Since 0.39.1 headless mode doesn't trust a folder on its own
  2. Turn on the sandbox with -s or tools.sandbox, and pick a proxied Seatbelt profile on macOS to cut network
  3. Set privacy.usageStatisticsEnabled to false to stop usage statistics
  4. Since 0.63.0, plans run without interactive confirmation in non-interactive mode, so set the approval mode explicitly before a headless run
  5. Authenticate with a paid Gemini API key or Vertex credentials. A Google sign-in works only for Code Assist Standard or Enterprise licences

Muse Code

  1. Set META_API_KEY for headless runs. Browser sign-in isn't available in CI or for Meta Managed Accounts
  2. Gate on your own test command, not the exit code. muse exec returns 0 when the turn completes even if tests still fail
  3. Pass --max-model-steps on unattended runs so a stuck task can't loop
  4. Prefer --disable-approval to --yolo in CI so the sandbox stays on. On Linux the runner needs a working bubblewrap and a non-musl build
  5. Turn Contributor mode off in /settings before a subscription session touches private code

Questions

Which is better for AI agents, Gemini CLI or Muse Code?

Gemini CLI scores 66.7 (B) on agent readiness against Muse Code's 61.3 (C), and leads in 4 of 7 scored categories.

Are Gemini CLI and Muse Code open source?

Gemini CLI is open source (Apache-2.0). No open-source release is listed for Muse Code.

Other comparisons with Gemini CLI or Muse Code

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