Leyline
Sorcery
fx is a Vercel Labs coding-agent harness and CLI written in Zig. Official copy positions it as a tiny, open, native agent originally used internally, now open sourced for research and embedding in larger systems. The durable object is the product at fx.sh / vercel-labs/fx, not the tweet.
Interface
cliCommand-line interface
[ Observed sample ]
The count is distinct observed stacks. It is not a Score input.
This component is not in Leyline's observed sample.
Record cmp_fx
[ Score explain ]
Score v2 uses only observed signals. The displayed contribution is weight × value × 100. Missing factors are insufficient evidence.
Score factor
GitHub health18% weight. A licence is declared. Documentation is available.
Value 0.30 · 5.4 points
18% weight × 0.30 value
A licence is declared. Documentation is available.
Score factor
Agent use16% weight. insufficient evidence
insufficient evidence
insufficient evidence
insufficient evidence
Score factor
Human notes14% weight. insufficient evidence
insufficient evidence
insufficient evidence
insufficient evidence
Score factor
Composability16% weight. insufficient evidence
insufficient evidence
insufficient evidence
insufficient evidence
Score factor
Checklist10% weight. No MCP surface is declared. No API is declared. Cost is unknown. 0 of 3 checklist fields are complete.
Value 0.00 · 0.0 points
10% weight × 0.00 value
No MCP surface is declared. No API is declared. Cost is unknown. 0 of 3 checklist fields are complete.
Score factor
Evidence quality14% weight. 2 sources cover 1 evidence types. The latest dated evidence is 2026-08-19. Freshness is omitted unless observed as a signal.
Value 0.23 · 3.2 points
14% weight × 0.23 value
2 sources cover 1 evidence types. The latest dated evidence is 2026-08-19. Freshness is omitted unless observed as a signal.
Score factor
Benchmarks12% weight. insufficient evidence
insufficient evidence
insufficient evidence
insufficient evidence
Agent use: insufficient evidence
Human notes: insufficient evidence
Composability: insufficient evidence
Benchmarks: insufficient evidence
[ Claims ]
Claims are what the publisher declares. Score uses observed signals, not these assertions, except for checklist fields derived from interfaces. MCP, API, cost, and license claims are marked verified, unverified, or contradicted from intake evidence.
Interface
cliCommand-line interface
[ Capability slices ]
fx is a Vercel Labs coding-agent harness and CLI written in Zig. Official copy positions it as a tiny, open, native agent originally used internally, now open sourced for research and embedding in larger systems. The durable object is the product at fx.sh / vercel-labs/fx, not the tweet.
[ Relations ]
No alternative-to or fills-same-slot-as relation is derived yet.
[ Signals ]
Signals carry source, method, and observedAt. Source review dates and evidence basis are shown separately. Unobserved metrics stay insufficient evidence.
Evidence basis unknown · Check date unknown · Source date 2026-08-19
No social source is stored.
Propose a change with a public source. Corrections wait for review before the card changes.
[ Notes ]
No notes are stored.