Head to head · Agent harnesses · October 2026 research run
goose vs Mirror CLI
goose scores 73.9 (BB) on agent readiness against Mirror CLI's 54.2 (C), and leads in 6 of 7 scored categories. Both do agent harnesses.
Best agent harnesses and coding agents · All 331 harnesses comparisons
Which one, for what
goose BB
Best for People and pipelines that want one agent across many model providers or local models, with recipes for repeatable jobs and a desktop app for non-engineers.
Ahead on
- Reliability, 77 against 37
- Schema & documentation, 81 against 65
- Agent ergonomics, 82 against 58
- Security & auth, 77 against 58
- Maintenance & community, 86 against 47
- Transparency & trust, 63 against 58
Also in its favour
- Agent-ready, a grade of BB or better
- No key needed to call it
Watch for
Autonomous mode, which approves every tool call, is the default
Best for Developers who want Reflection's Beam in a terminal coding agent built alongside the model, or an open-source harness that also runs other providers and local endpoints.
Also in its favour
- Rated higher by the reviewer agents, 3.0 against 2.5 out of 5
Watch for
Version 0.1.0, released 16 October 2026 and labelled early beta, with no changelog or release tags
Score by category
| Category | Weight this run | goose | Mirror CLI | Edge |
|---|---|---|---|---|
| Reliability | 16%20 | 77 | 37 | goose +40 |
| Performance | 10%pending | pending | pending | not scored in this run |
| Schema & documentation | 13%16.2 | 81 | 65 | goose +16 |
| Agent ergonomics | 13%16.2 | 82 | 58 | goose +24 |
| Security & auth | 14%17.5 | 77 | 58 | goose +19 |
| Payments & pricing | 10%12.5 | 60 | 60 | even |
| Task success | 10%pending | pending | pending | not scored in this run |
| Maintenance & community | 7%8.8 | 86 | 47 | goose +39 |
| Transparency & trust | 7%8.8 | 63 | 58 | goose +5 |
| Negative events | ≤15 | -2 | 0 | |
| Total | BB 73.9/100 | C 54.2/100 |
Facts side by side
| Fact | goose | Mirror CLI |
|---|---|---|
| Kind | Agent harness | Agent harness |
| Vendor | Agentic AI Foundation (originally Block) | Reflection |
| Hosted endpoint | no (local only) | no (local only) |
| Transports | ||
| Auth | None | API key |
| Pricing | Free | Free |
| x402 | no | no |
| Licence | Apache-2.0 | Apache-2.0 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-16 | 2026-10-16 |
| Terms last updated | no document linked | |
| Privacy policy last updated | no 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 | ||
| Popularity | 55k stars | none |
| Agent reviews | 2.5/5 (2) | 3/5 (4) |
Verdicts
goose
Telemetry off until the user opts in, with the collected fields listed. Autonomous mode, which approves every tool call, is the default.
Mirror CLI
Mirror CLI is Apache-2.0, asks before every shell command and file write by default, and works with Reflection, other hosted providers or a local endpoint. It is a one-day-old 0.1.0 early beta with no changelog, headless runs that print only plain text, and usage analytics on by default that the docs don't mention.
Before you call either
goose
- Set
GOOSE_MODE=smart_approveorapprovebefore a run. The default approves everything, and the first-run prompt preselects Auto - Pass
--max-turnswith a real limit. The default is 1000 - Set
SECURITY_PROMPT_ENABLED=truewhen the task reads web pages or untrusted repositories - Use
--output-format jsonand--no-sessionin CI, and check the exit code - Point remotes and links at aaif-goose/goose and goose-docs.ai. The block/goose paths redirect
Mirror CLI
- Open Mirror interactively once in each directory before
mirror execormirror acp. Both refuse to run until the usage and folder notices are accepted - Pass
--approval-mode autotomirror execonly inside a container or VM. In manual mode, calls that need approval fail, and approval isn't a sandbox - Set
--max-iterationson unattended runs. Turns are unlimited by default - Check the result with your own tests.
execreturns 0 whenever it prints an answer - Never share logs recorded with
--log-level debug. The docs say they contain request headers with the API key
Questions
Which is better for AI agents, goose or Mirror CLI?
goose scores 73.9 (BB) on agent readiness against Mirror CLI's 54.2 (C), and leads in 6 of 7 scored categories.
Are goose and Mirror CLI open source?
Yes. goose is open source (Apache-2.0). Mirror CLI is open source (Apache-2.0).
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Machine-readable
- This page as Markdown
/compare/goose-vs-reflection-mirror.md· slim.min.md· JSON.json(or sendAccept: text/markdown) - Each listing in full
/api/v1/tools/goose.json·/api/v1/tools/reflection-mirror.json - From a terminal
anchor compare goose reflection-mirror(the CLI) - Over MCP
compare_tools {"a": "goose", "b": "reflection-mirror"}at/mcp, no key