Kernel through One
Kernel is a serverless browser automation and web agent platform that enables developers to deploy, scale, and run headless or full-browser tasks as APIs without managing infrastructure, offering parallel execution, session persistence, real-time debugging, and usage-based pricing.
One exposes Kernel through four MCP tools. The table below carries real action ids from One's knowledge base, so for a common operation you can skip search and go straight to reading the action's parameters.
How to run an action
- Find the action in the table below, or call
search_one_platform_actions with platform kernel if it is not listed.
- Call
get_one_action_knowledge with the action id. Do this every time, including for actions in this table. The table gives you the id, not the parameters.
- Call
execute_one_action with parameters copied from that knowledge.
Never guess a parameter name, a body field, or an enum value. The knowledge has the real schema, and a guessed field is either a 400 or a silent write of the wrong thing.
Before you start
Call list_one_integrations once and confirm Kernel is connected. If it is missing, the user has not connected it: say so and point them at https://app.withone.ai rather than reaching for raw HTTP.
Each connection carries an access field. If it reports {"policy": "methods", "methods": ["GET"]} the agent is read-only here, so plan a read-only answer instead of attempting a write that will be refused.
Before a write
Creates, updates, deletes and sends land on a real Kernel account and cannot be recalled. State the action and the specific target in one line before the first write in a task, and let the user stop you. Reads need no confirmation.
Actions
Browsers
| Action |
Method |
Path |
Action id |
| Download a Browser Session Directory as a ZIP Archive |
GET |
/browsers/{{id}}/fs/download_dir_zip |
conn_mod_def::GJ4tAzjrq8w::2nfAviSJTcGAMBdevhIS5Q |
| Get a Browser Session’s Details |
GET |
/browsers/{{id}} |
conn_mod_def::GJ4tCHo6OGg::lL2SSIgOSfmI7s0A6iGDSw |
| List Browser Sessions |
GET |
/browsers |
conn_mod_def::GJ4tCJfyu9Y::jnKv_I4oQS-iM_kMiR5DsA |
| Stream a Browser Process’s Stdout |
GET |
/browsers/{{id}}/process/{{processId}}/stdout/stream |
conn_mod_def::GJ4tBkFNtyw::39FSFdqXSkmBAuhtR-KY-Q |
| Click Mouse in a Browser Session |
POST |
/browsers/{{id}}/computer/click_mouse |
conn_mod_def::GJ4tAmpXkWM::l8DWToomTXer2Zq8EBeTrg |
| Create a Browser Session |
POST |
/browsers |
conn_mod_def::GJ4tB65TNaM::yV5IE-gERVCtkBiD2Vjnfw |
| Delete a Browser Session by ID |
DELETE |
/browsers/{{id}} |
conn_mod_def::GJ4tCAbDYF0::u4AebMEcSzqG9ZpWdcahpw |
| Delete a Persistent Browser Session (Deprecated) |
DELETE |
/browsers |
conn_mod_def::GJ4tB5PNbYg::YhSsD4D8S7GNE5cJY1vxpg |
| Drag Mouse in a Browser Session |
POST |
/browsers/{{id}}/computer/drag_mouse |
conn_mod_def::GJ4tAfeg_Kg::SjX0ckaISlOOh90z2G4g0Q |
| Execute a Browser Session Command (Synchronous) |
POST |
/browsers/{{id}}/process/exec |
conn_mod_def::GJ4tBjnG6h0::_7-Eze0ARgGb65PXqwPwjw |
| Execute a Browser Session’s Batch Computer Actions |
POST |
/browsers/{{id}}/computer/batch |
conn_mod_def::GJ4tB5nySlo::jJXizvNdTDWxw6Q-KNIrWg |
| Execute Playwright Code in a Browser Session |
POST |
/browsers/{{id}}/playwright/execute |
conn_mod_def::GJ4tBQHI5TY::6mEuJolvRK2KiqhvDocNPw |
12 more Browsers actions are available through search.
AuthConnections
| Action |
Method |
Path |
Action id |
| Get an Auth Connection by ID |
GET |
/auth/connections/{{id}} |
conn_mod_def::GJ4tDNkRmDU::SnI8JkRMTMqBYIe-YfoEGg |
| List Auth Connections |
GET |
/auth/connections |
conn_mod_def::GJ4tDQJjgX4::DvQRmw07RnyzRqptzPpplA |
| Stream an Auth Connection’s Login Flow Events |
GET |
/auth/connections/{{id}}/events |
conn_mod_def::GJ4tDXGzeLo::5qBf_MJZQomaEMYmasIPDw |
| Create an Auth Connection |
POST |
/auth/connections |
conn_mod_def::GJ4tDApsxzY::goBZ6CE3Qxqh1W4sQV51Yw |
| Delete an Auth Connection |
DELETE |
/auth/connections/{{id}} |
conn_mod_def::GJ4tDOUXda8::MpSAjLgSTDi-NhQZHZDJ0A |
| Exchange an Auth Connection Handoff Code for a JWT |
POST |
/auth/connections/{{id}}/exchange |
conn_mod_def::GJ4tDNSJZT0::ibjOaojDRHKdVyBWwcCRtw |
| Start a Login Flow for an Auth Connection |
POST |
/auth/connections/{{id}}/login |
conn_mod_def::GJ4tDOCrYJY::VNExYA2OSzmmMiCXjJoRNw |
| Submit Auth Connection Field Values |
POST |
/auth/connections/{{id}}/submit |
conn_mod_def::GJ4tDXS0fL0::AOkU0IpZRsmj58JsTuKqQg |
BrowserPools
| Action |
Method |
Path |
Action id |
| Get a Browser Pool’s Details |
GET |
/browser_pools/{{idOrName}} |
conn_mod_def::GJ4tBYYPuVY::FDzlpVqeTYm-v5AogxJyyw |
| List Browser Pools |
GET |
/browser_pools |
conn_mod_def::GJ4tBYnkBGU::MVkYwMVGROODsvifX2g_qA |
| Acquire a Browser from a Browser Pool |
POST |
/browser_pools/{{idOrName}}/acquire |
conn_mod_def::GJ4tBP6Y3jY::ZX7h8c-kQFaYWjnpSM3FYQ |
| Create a Browser Pool |
POST |
/browser_pools |
conn_mod_def::GJ4tBQB43Y4::P7hw4qaORmq812e2hhePXg |
| Delete a Browser Pool |
DELETE |
/browser_pools/{{idOrName}} |
conn_mod_def::GJ4tBP6zz9A::dqmrkSVQRvSLVMtKWaDKrw |
| Flush a Browser Pool’s Idle Browsers |
POST |
/browser_pools/{{idOrName}}/flush |
conn_mod_def::GJ4tBRcio_g::hUeSq9SpSuSB9kqYeMzFLQ |
| Release a Browser Pool Browser Back to the Pool |
POST |
/browser_pools/{{idOrName}}/release |
conn_mod_def::GJ4tBcNvLFE::SGTq5yI3ScOgnVLeBlTKcA |
| Update a Browser Pool by ID or Name |
PATCH |
/browser_pools/{{idOrName}} |
conn_mod_def::GJ4tBZwWpsI::gJj4lfpGQTmK8dHtG78xKw |
CredentialProviders
| Action |
Method |
Path |
Action id |
| Get a Credential Provider by ID |
GET |
/org/credential_providers/{{id}} |
conn_mod_def::GJ4tCT-FOIk::rfVjBlqaQG6oLYXXTsABmA |
| List an Organization’s Credential Providers |
GET |
/org/credential_providers |
conn_mod_def::GJ4tCQOTSe0::FHD_1KOZQUOg19BK4lfp8Q |
| Create an Organization Credential Provider |
POST |
/org/credential_providers |
conn_mod_def::GJ4tCIUryyU::W8DAe-5aSJ6f59kvkPaorA |
| Delete an Organization Credential Provider |
DELETE |
/org/credential_providers/{{id}} |
conn_mod_def::GJ4tCRTy9xg::7ciNI8fuSKa4N2-UWM2Abg |
| Test an Organization Credential Provider Connection |
POST |
/org/credential_providers/{{id}}/test |
conn_mod_def::GJ4tCQ5MY2k::NXdmJOdTRSKK15uKBAfdqA |
| Update a Credential Provider |
PATCH |
/org/credential_providers/{{id}} |
conn_mod_def::GJ4tCatz-4U::T5pE4RCLSI2wAlWz0PAcJg |
Credentials
| Action |
Method |
Path |
Action id |
| Generate a Credential’s TOTP Code |
GET |
/credentials/{{idOrName}}/totp-code |
conn_mod_def::GJ4tCbCRbas::gi9qhJ54Sa6qqJphGWn3mw |
| Get a Credential by ID or Name |
GET |
/credentials/{{idOrName}} |
conn_mod_def::GJ4tCa4RKuc::ObzGhcZ2ThCwtpSPSY40wA |
| List Credentials |
GET |
/credentials |
conn_mod_def::GJ4tCmGLX24::f5Xlko38R-GIftNhnjlBig |
| Create a Credential |
POST |
/credentials |
conn_mod_def::GJ4tCbNUOmw::V9K33gZkTxWw4cxlIRv_iA |
| Delete a Credential by ID or Name |
DELETE |
/credentials/{{idOrName}} |
conn_mod_def::GJ4tCd0goB0::8qwHROxwRWWCFySnnzjDCg |
| Update a Credential by ID or Name |
PATCH |
/credentials/{{idOrName}} |
conn_mod_def::GJ4tCmSNivI::tzz--yH-SvybiviaTi_M1Q |
Invocations
| Action |
Method |
Path |
Action id |
| Get an Invocation’s Details |
GET |
/invocations/{{id}} |
conn_mod_def::GJ4tC1CN5dU::8JzCZwUrSHC7b19B_5QX9A |
| List Invocations |
GET |
/invocations |
conn_mod_def::GJ4tDCJDfg4::IlDQNjhyS8mD0qPBYLhEyA |
| Stream an Invocation’s Events |
GET |
/invocations/{{id}}/events |
conn_mod_def::GJ4tDGCCgtA::P3WezkzbQgaXq5mLkleLog |
| Delete an Invocation’s Browser Sessions |
DELETE |
/invocations/{{id}}/browsers |
conn_mod_def::GJ4tC1L2MiU::1yLCv1_URbOCdPX_0rey4A |
| Invoke an Action |
POST |
/invocations |
conn_mod_def::GJ4tC07F9MI::YiwoOSUyRteud9gTSIrApw |
| Update an Invocation by ID |
PATCH |
/invocations/{{id}} |
conn_mod_def::GJ4tDD8s0zo::HAS165ucTxqcZ-84a4Rheg |
Deployments
| Action |
Method |
Path |
Action id |
| Get Deployment Details |
GET |
/deployments/{{id}} |
conn_mod_def::GJ4tClEiMVw::h2mldCQeRiWugzpCLjVtCw |
| List Deployments |
GET |
/deployments |
conn_mod_def::GJ4tCuM3A5I::klcj7155RTW1CxaD5P0H2g |
| Stream a Deployment’s Events |
GET |
/deployments/{{id}}/events |
conn_mod_def::GJ4tCtf8Dgw::_GkfzbXgQpO1Tl6g6qRB_g |
| Create a Deployment |
POST |
/deployments |
conn_mod_def::GJ4tCmKYAGU::6UzQPF0OSEmh_yEp75lSWQ |
| Delete a Deployment |
DELETE |
/deployments/{{id}} |
conn_mod_def::GJ4tCkhuCtg::gWOyKoH9R_eQ8Y1vCS7PTw |
Profiles
| Action |
Method |
Path |
Action id |
| Download a Profile Archive (ZIP) by ID or Name |
GET |
/profiles/{{idOrName}}/download |
conn_mod_def::GJ4tDXIKKvo::X_DzjhxqQeapnBVUX7W11A |
| Get a Profile by ID or Name |
GET |
/profiles/{{idOrName}} |
conn_mod_def::GJ4tDeBcQ7g::SysiMTUqQn6KD9s6L2Hwdw |
| List Profiles |
GET |
/profiles |
conn_mod_def::GJ4tDek1bXQ::gCxNfUEhQpe57jTVOP4NOg |
| Create a Profile |
POST |
/profiles |
conn_mod_def::GJ4tDXHChwc::_vge-NC-QEGdk4PFtBPENw |
| Delete a Profile by ID or Name |
DELETE |
/profiles/{{idOrName}} |
conn_mod_def::GJ4tDXJqDYg::rChhDXvSSvy6mR5etSq_kQ |
Proxies
| Action |
Method |
Path |
Action id |
| Get a Proxy by ID |
GET |
/proxies/{{id}} |
conn_mod_def::GJ4tDq-LCzA::70hT9Jt1SUq5N3lNXwo5qA |
| List Proxies |
GET |
/proxies |
conn_mod_def::GJ4tDqDMkJE::-xQNWs8sSTO_BW4GxMIE1A |
| Check a Proxy’s Health |
POST |
/proxies/{{id}}/check |
conn_mod_def::GJ4tDhPZxxs::OWDCWVx8S6ukOReHwW4rrw |
| Create a Proxy |
POST |
/proxies |
conn_mod_def::GJ4tDem1d4Q::LDo3vHv6R-K4URMtI9Ps4A |
| Delete a Proxy by ID |
DELETE |
/proxies/{{id}} |
conn_mod_def::GJ4tDjnPbtE::MDVbhkFwTE-_Fw5DFI9jEw |
Extensions
| Action |
Method |
Path |
Action id |
| Download an Extension Archive (by ID or Name) |
GET |
/extensions/{{idOrName}} |
conn_mod_def::GJ4tCtNq_10::KC2eQ94OR9ON5g3a3r5P3A |
| Download Unpacked Extension from Chrome Web Store |
GET |
/extensions/from_chrome_store |
conn_mod_def::GJ4tCt-Vufc::LqfOnrmdQAKx9Jwr-pyn5Q |
| List Browser Extensions |
GET |
/extensions |
conn_mod_def::GJ4tC07fr-Y::Fn_1Y4mKRoiTmggIhpLMwA |
| Delete an Extension by ID or Name |
DELETE |
/extensions/{{idOrName}} |
conn_mod_def::GJ4tCtV4qPQ::4n-O76P9TJ2X-4nkrXi_Zg |
| Upload a Browser Extension |
POST |
/extensions |
conn_mod_def::GJ4tC5Rb9Sk::lXbEfiDRQ7qtAJ1DB7xZxA |
AuthAgents
| Action |
Method |
Path |
Action id |
| Get an Auth Agent by ID (Deprecated) |
GET |
/agents/auth/{{id}} |
conn_mod_def::GJ4tAWXmqwQ::mRR3C16KTDm-xdHEE2u5yQ |
| List Auth Agents (Deprecated) |
GET |
/agents/auth |
conn_mod_def::GJ4tAXf5NmE::J92v6uV8TAuPkdgbDzWfjA |
| Create or Find an Auth Agent |
POST |
/agents/auth |
conn_mod_def::GJ4tAIOScfc::U5VJhWy9QjCzVf3h5J9c_Q |
| Delete an Auth Agent |
DELETE |
/agents/auth/{{id}} |
conn_mod_def::GJ4tAICoMUc::12AoJ8fSR9-NGvPy1njBhA |
BrowserReplays
| Action |
Method |
Path |
Action id |
| Download a Browser Replay Recording |
GET |
/browsers/{{id}}/replays/{{replayId}} |
conn_mod_def::GJ4tBwf4zTI::rzDQmLdeQra9oqcWaPXbEg |
| Start a Browser Session Replay Recording |
POST |
/browsers/{{id}}/replays |
conn_mod_def::GJ4tBwtGtgE::o9PAkdo8TXi52wID2v7yIQ |
| Stop a Browser Session Replay Recording |
POST |
/browsers/{{id}}/replays/{{replayId}}/stop |
conn_mod_def::GJ4tBw84VXs::mOqlx5m0RjmQLZe2s7_hXQ |
BrowserSessionFiles
| Action |
Method |
Path |
Action id |
| Read a Browser Session File’s Contents |
GET |
/browsers/{{id}}/fs/read_file |
conn_mod_def::GJ4tA7IS8HA::xctMYuSfQXmxZp37r4HWYw |
| Delete a Browser Session File |
PUT |
/browsers/{{id}}/fs/delete_file |
conn_mod_def::GJ4tAzudqHw::Okr233yNS322IMdnOh-w9A |
| Write a Browser Session File |
PUT |
/browsers/{{id}}/fs/write_file |
conn_mod_def::GJ4tBIlBpVU::u2LoGTF-RYOey6nM18ae6A |
BrowserProcesses
| Action |
Method |
Path |
Action id |
| Spawn an Asynchronous Process in a Browser Session |
POST |
/browsers/{{id}}/process/spawn |
conn_mod_def::GJ4tBb3lFSo::lZ59vdRoQ5eFz3MSUnQghQ |
| Write to a Browser Process’s STDIN |
POST |
/browsers/{{id}}/process/{{processId}}/stdin |
conn_mod_def::GJ4tBx68sDU::p0gAwvGIT0mKtFFAeOFDtQ |
AuthAgentInvocations
| Action |
Method |
Path |
Action id |
| Get an Auth Agent Invocation's Details (Deprecated) |
GET |
/agents/auth/invocations/{{invocationId}} |
conn_mod_def::GJ4tAXaHLas::DXrjppJ7SJepCXbnC2DZRg |
| Create an Auth Agent Invocation |
POST |
/agents/auth/invocations |
conn_mod_def::GJ4tAIWoIgc::XalyTov-SYu5-oyecO5vZQ |
AgentAuthInvocations
| Action |
Method |
Path |
Action id |
| Exchange an Agent Auth Invocation's Handoff Code for a JWT |
POST |
/agents/auth/invocations/{{invocationId}}/exchange |
conn_mod_def::GJ4tALq3yrI::IdN5hVYMRHG4shPsRIev6A |
BrowserSessionFilesystem
| Action |
Method |
Path |
Action id |
| Delete a Browser Session Directory |
PUT |
/browsers/{{id}}/fs/delete_directory |
conn_mod_def::GJ4tAzfXDMU::3RAMj7VcR2C4iLmBXy1akg |
BrowserSessionFileInfo
| Action |
Method |
Path |
Action id |
| Get a Browser Session File or Directory Info |
GET |
/browsers/{{id}}/fs/file_info |
conn_mod_def::GJ4tAznw0cg::YrbWQfn4RpaybK8ysxMY4g |
InvocationBrowsers
| Action |
Method |
Path |
Action id |
| List an Invocation’s Browsers |
GET |
/invocations/{{id}}/browsers |
conn_mod_def::GJ4tDDh17hs::jtfAESytSgawnnzFECc7Rg |
BrowserSessionReplays
| Action |
Method |
Path |
Action id |
| List a Browser Session’s Replays |
GET |
/browsers/{{id}}/replays |
conn_mod_def::GJ4tBw0oqfg::T1WCuz6KSemy8Y4o1yHxJw |
BrowserExtensions
| Action |
Method |
Path |
Action id |
| Upload Extensions to a Browser Instance |
POST |
/browsers/{{id}}/extensions |
conn_mod_def::GJ4tB8DYe6k::lUM-DfvQRhqsJ1kVJCp0cQ |
BrowserSessionDirectoryWatches
| Action |
Method |
Path |
Action id |
| Start a Browser Session Directory Watch |
POST |
/browsers/{{id}}/fs/watch |
conn_mod_def::GJ4tBHv3xrY::rr8g3id2RSiJKWCNTtNgXQ |
Apps
| Action |
Method |
Path |
Action id |
| List Apps |
GET |
/apps |
conn_mod_def::GJ4tAPGPiAQ::EqDDVThcSBSmZiOd_CCFow |
AuthInvocations
| Action |
Method |
Path |
Action id |
| Submit Field Values for an Auth Invocation (Deprecated) |
POST |
/agents/auth/invocations/{{invocationId}}/submit |
conn_mod_def::GJ4tAWpMAjQ::HlbQ0tWYT1mjRk_JCpIfUw |
BrowserScreenshots
| Action |
Method |
Path |
Action id |
| Take a Browser Session Screenshot (Region) |
POST |
/browsers/{{id}}/computer/screenshot |
conn_mod_def::GJ4tAXIdNAk::0TWYxKcYQwehPJt057q11w |
This lists 90 of 112 actions. For anything not here, call search_one_platform_actions with platform kernel. The full catalog is at https://www.withone.ai/knowledge/kernel.
When a call fails
The error comes from Kernel, not from One. A 400 or 422 means your parameters do not match the schema, so re-read the knowledge and fix the field. A 401 or 403 means the connection needs re-authorizing, which no retry will fix. A 404 means the id is not on this account. A 429 means slow down. Never retry a write more than once: the first attempt may have landed.
Full catalog: https://www.withone.ai/knowledge/kernel
Integration knowledge by One (withone.ai), licensed under One-Knowledge-1.0. Attribution must be preserved in derivative works.
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