npm/vercelvercel
offers a no-account or temporary-account path: no; the agent stops at the signup wall
npm/vercelagent trajectory
Awaiting three identical trials
Deterministic observations can identify likely friction, but they cannot license the claim that an agent passed or failed.
deterministic evidence · not the rank
Every check, its evidence, and the fix
N/A is excluded from both numerator and denominator. Open a check to inspect what the probe observed.
Legibility
can an agent learn this tool from its own surface?
failD1.1machine-readable schema (`schema` / `--describe` returns JSON)0/8
no capability document; agent must parse help prose
Add a `schema` or `--describe` command that prints the complete command, option, input, and output schema as JSON.
failD1.2exposes an MCP surface0/4
no
Expose the same command surface as MCP tools over stdio and make `tools/list` work without credentials.
passD1.3help contains usage examples3/3
yes
Structured I/O
is the output machine-parseable?
failD2.1documents a JSON output mode0/10
no machine-parseable output documented
Add and document `--json` or `--output json`, then keep its keys and types stable for scripts and agents.
passD2.2no ANSI escapes when the stream is piped5/5
clean
passD2.3has a quiet mode5/5
yes
Non-blocking
does it ever hang when no human is present?
naD3.1does not hang when stdin is a non-delivering pipen/a
reads stdin by design (filter or REPL)
passD3.2--help does not hang4/4
ok
passD3.3documents a non-interactive escape hatch4/4
yes
failD3.4cold invocation under 3s0/4
8.01s
Defer plugins, updates, auth, and network initialization until after argument parsing so a cold invocation returns within 3 seconds.
Context economy
how many tokens does it cost to use?
partialD4.1help fits an agent context budget3/8
5764 bytes (~1441 tokens)
Keep top-level help concise and move detail into subcommand help or machine-readable schema output.
passD4.2does not reprint full help on every mistake7/7
181 bytes
Safety rails
can an agent preview before it destroys?
failD6.1offers a dry-run0/5
no
Add `--dry-run` to mutating commands; validate locally and print the exact planned changes without making network calls.
passD6.2offers an explicit confirmation bypass5/5
yes
Error recovery
does a mistake produce an honest, actionable signal?
passD7.1unknown subcommand exits non-zero8/8
exit 1
passD7.2unknown flag exits non-zero8/8
exit 1
passD7.3error message is terse4/4
181 bytes
Cold credentials
can an agent get authenticated without a human?
failD9.1names its credential env var in its own help surface0/6
agent must already know the variable name; undiscoverable from --help
Name the supported credential environment variable in `--help`, including its precedence over config files.
failD9.2offers a no-account or temporary-account path0/8
no; the agent stops at the signup wall
Offer a documented temporary, guest, or claim-later path so a cold agent can complete one useful task without signup.
passD9.3does not launch a browser auth flow in a headless context6/6
ok