feat(providers): add Steel cloud browser provider#1302
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Reimplements Steel as a native Rust provider in cli/src/native/providers.rs,
mirroring the Browserless/Kernel pattern. Selectable via `-p steel` or
`AGENT_BROWSER_PROVIDER=steel`; requires `STEEL_API_KEY`.
Optional env vars configure session behavior: STEEL_TIMEOUT_MS,
STEEL_HEADLESS, STEEL_SOLVE_CAPTCHA, STEEL_USE_PROXY, STEEL_PROXY_URL,
STEEL_REGION, STEEL_BLOCK_ADS, STEEL_PROFILE_ID, STEEL_PERSIST_PROFILE,
STEEL_DEVICE. Sessions are explicitly released on connect failure via
POST /v1/sessions/{id}/release.
The CDP WebSocket URL has the API key appended as an apiKey query param
before connecting (preserving any pre-existing apiKey).
Supersedes the closed PR vercel-labs#532 which targeted the deleted src/browser.ts
TypeScript layer.
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Summary
-p steelorAGENT_BROWSER_PROVIDER=steel.connect_steel()incli/src/native/providers.rsmirrors the Browserless/Kernel pattern: readsSTEEL_*env vars, POSTs toapi.steel.dev/v1/sessions, returns the CDP WS URL withapiKeyappended.close_provider_session()POSTs to/v1/sessions/{id}/releaseon connect failure (best-effort, mirrors Kernel).Env vars
STEEL_API_KEYSTEEL_TIMEOUT_MSSTEEL_HEADLESSSTEEL_SOLVE_CAPTCHASTEEL_USE_PROXYSTEEL_PROXY_URLSTEEL_REGIONSTEEL_BLOCK_ADSSTEEL_PROFILE_IDSTEEL_PERSIST_PROFILESTEEL_DEVICEContext
Reimplementation of #532 against the post-
8e43469("full native") provider system. The original PR targetedsrc/browser.tswhich no longer exists; this version lives entirely incli/src/native/providers.rs. Behavioral spec (env var names, request/response shapes, apiKey-on-WS handling) is preserved verbatim from #532.Test plan
cargo buildcleancargo fmt --check&cargo clippy -- -D warningscleanSTEEL_API_KEY=... agent-browser -p steel open https://example.comconnects, navigates, returns title;close --allreleases cleanlyNotes
End-to-end HTTP-mocked test from the TS PR was not ported —
providers.rshas no mock framework today, and adding one was out of scope. Unit tests cover env-var parsing and WS URL builder; integration is covered by the smoke run above.Closes #532 (superseded).