starship

The minimal, blazing-fast, and infinitely customizable prompt for any shell

workhorse Rust starship/starship
70% pass rate
2/8 principles met

Spec Coverage

How many of the spec's requirements were verified for this tool. See /coverage for the full matrix.

Level Total Verified Unverified
MUST 28 19 9
SHOULD 21 13 8
MAY 10 10 0

Audience signal: mixed

This tool sends mixed signals: some agent-readable affordances are present, others are not. Treat the warnings below as friction points, not defects.

This is an informational signal, not an authoritative verdict — see methodology. The per-audit evidence below is the ground truth.

Top Issues

All Audits

P1: Non-Interactive by Default

PASS Non-interactive by default
SKIP Non-interactive gate flag advertised in --help target satisfies P1 via alternative gate (help-on-bare or stdin-primary)
WARN Flags advertise env-var bindings in --help 2 flag(s) found in --help but no `[env: NAME]` bindings advertised
PASS Secret-bearing flags expose stdin or *-file companion
WARN `--help` advertises default values for flags no default-value annotations found in --help. SHOULD-tier — agents reading help text need to see what value a flag falls back to when omitted (`[default: <value>]` per clap convention).
WARN Rich-TUI affordance for TTY contexts no rich-TUI affordance detected (no `--tui`/`--interactive`/`--ui` flag, no spinner/progress/tui mention in --help). MAY-tier — rich TUI in TTY contexts is a nice-to-have, not required.

P2: Structured, Parseable Output

WARN Structured output support --output/--format flag detected but could not validate JSON via safe probes (--help/--version override output flags in most CLIs)
SKIP Structured-output CLI exposes its schema at runtime no structured-output indicator (--output / --format / json / jsonl) in --help
WARN --json / --jsonl short aliases for --output no --json or --jsonl short alias found. Agents and pipelines benefit from short forms alongside the canonical `--output` enum.
WARN `--raw` flag for pipe-safe unformatted output no `--raw` flag advertised. MAY-tier — useful for pipelines that want to strip formatting before piping to other tools.
SKIP `--output` advertises additional formats beyond text/json no `--output` or `--format` flag advertised; vacuous skip for MAY-tier extra formats.
PASS Bad invocation exits with structured usage-error code (2)
SKIP Errors emit JSON envelope with `error`/`kind`/`message` under `--output json` binary does not advertise `--output json` in --help; MUST applies only to CLIs that opt into the JSON contract.
SKIP JSON success and error envelopes share their non-payload key set binary does not advertise `--output json` in --help; envelope-consistency only applies to CLIs that opt into the JSON contract.

P3: Progressive Help Discovery

PASS Help flag produces useful output
PASS Version flag works (`--version` plus short alias)
PASS Version flag works (`--version` plus short alias)
WARN `examples` subcommand or `--examples` flag for curated usage patterns no `examples` subcommand or `--examples` flag found. MAY-tier — a curated usage block keeps agents from hunting through long help text.
WARN Short `-h` summary differs from `--help` long form `-h` and `--help` produce byte-identical output. SHOULD-tier — clap renders the short summary on `-h` and the full description on `--help` when `long_about` is set; collapsing them gives agents no concise list-level grep target.
FAIL Each subcommand's `--help` ships at least one invocation example subcommands missing example invocations in their `--help`: bug-report, config, explain, init, module, preset, print-config, prompt, session, statusline, timings, toggle. Examples teach agents the call shape faster than option tables; use clap's `after_help` or a dedicated `Examples:` block.
WARN Help text pairs human and `--output json` example invocations no paired text + `--output json` example found within 5 lines in top-level or any subcommand `--help`. Pairing keeps agents from reverse-engineering the JSON invocation from the text one.

P4: Fail-Fast, Actionable Errors

PASS Rejects invalid arguments
PASS Error messages include a hint or remediation phrase
SKIP `--output json` produces JSON-formatted errors binary does not advertise `--output json` in --help; SHOULD applies only to CLIs that opt into the JSON contract.

P5: Safe Retries & Mutation Boundaries

FAIL Destructive subcommands require `--force` or `--yes` destructive subcommand(s) without `--force` or `--yes`: preset. Irreversible operations must require explicit confirmation so they can't be invoked accidentally.
WARN Read and write surfaces are both visible in subcommand list write-pattern subcommand(s) present (preset) but no read-pattern surface detected. If the CLI is write-only by design the MUST is satisfied vacuously; otherwise expose the read surface with agent-recognizable verbs (list/get/show/query/find/search).

P6: Composable, Predictable Command Structure

PASS Handles SIGPIPE gracefully
SKIP Pager-using CLI ships --no-pager escape hatch no pager signal (less/more/$PAGER/--pager) in --help
PASS Respects NO_COLOR
WARN Subcommand verbs follow community-standard names 5/14 subcommand(s) follow standard verb names. Non-standard: bug-report, module, preset, print-config, prompt, session, statusline, timings, toggle. MAY-tier — community-standard verbs (get/list/create/update/delete) help agents predict subcommand behavior across CLIs.
WARN `--color` flag for explicit color control no `--color` flag advertised. MAY-tier — `auto|always|never` lets agents and pipelines override the TTY-based default.
SKIP Input-accepting commands read from stdin when no file is given no input-accepting subcommand detected (process/parse/convert/transform/analyze/validate/format/lint/audit); vacuous skip for the conditional SHOULD.
PASS Subcommand naming follows a consistent verb/noun convention
PASS Operations are subcommands, not verb-shaped flags

P7: Bounded, High-Signal Responses

WARN Quiet mode available no --quiet/-q flag detected in --help output
WARN `--verbose` flag for diagnostic escalation no `--verbose` / `-v` flag advertised. SHOULD-tier — agents debugging failures need a way to escalate diagnostic detail.
SKIP `--limit` / `--max-results` flag for list operations no list-style subcommand detected (list/ls/search/query/find/show/get); vacuous skip for the list-only SHOULD.
SKIP Cursor-based pagination flags for list traversal no list-style subcommand detected; vacuous skip for the list-only MAY.
SKIP `--timeout` flag for long-running operations no long-running subcommand detected (serve/daemon/watch/tail/monitor/follow/run/start/stream); vacuous skip for the conditional SHOULD.
WARN Help text advertises TTY-aware verbosity behavior no TTY-aware language found in `--help`. MAY-tier — automatic verbosity reduction when stdout is piped or redirected lets agents skip the explicit `--quiet` flag. Behavioral probes cannot simulate a real TTY without a pty crate, so this audit relies on documented intent.

P8: Discoverable Through Agent Skill Bundles

PASS Skill bundle has install path (`tool skill install [<host>]`)
PASS `skill install --all` for multi-runtime install
PASS `skill update` / `skill upgrade` for bundle refresh

Details

Version scored
1.25.1
Audit date
2026-06-01 17:35:24 UTC
Duration
258ms
Platform
linux/x86_64
Mode
command
Anc build
0.5.0
Install
brew install starship

Embed the badge

This score (70%) clears the badge floor (70%). Copy this into your README:

[![agent-native](https://anc.dev/badge/starship.svg)](https://anc.dev/score/starship)

Preview: agent-native badge for starship

Reproduce this scorecard for starship locally and inspect the failing audits:

anc audit --command starship --output json

Install anc first if you don't have it. Add --output json to get the same JSON shape committed under scorecards/.