mcphost

host.tool_test

Dry-run a published tool by name: verdict (pass/will_fail/unverifiable), writes rolled back (dry_run); see host.quickstart.

Input Schema

TableJSON Schema

Name	Required	Description
`args`	No	Arguments to pass, same shape as a real call. Omit to run one example generated from the tool's args_schema; the response then carries example_args (what ran) and untyped (keys the schema gave no type for).
`name`	Yes	Local name of the already-published tool to dry-run.
`fixtures`	No	Chain tools only: {"<step number or tool name>": <recorded result>}. A fixtured step executes nothing (no upstream call); later mappings resolve against it. host.runs.get(run_id, as_fixtures=true) exports a real run in this shape.
`tenant_key`	No	The key `signup` returned. Optional on the connection that ran signup (or host.redeem): that connection is already bound to the tenant it created, so later calls on it need no tenant_key. On a connection with no Authorization: Bearer header and no prior signup, omitting it implicitly signs that connection up as a brand-new tenant and runs this call as it -- see host.whoami's source field. When both a header and this argument are present, the header wins.

Output Schema

TableJSON Schema

Name	Required	Description	Default
`id`	No
`ok`	No
`tz`	No
`msg`	No
`args`	No
`kind`	No
`line`	No
`name`	No
`next`	No
`tool`	No
`error`	No
`outer`	No
`state`	No
`steps`	No
`detail`	No
`reason`	No
`result`	No
`schema`	No
`changed`	No
`created`	No
`dry_run`	Yes
`enabled`	No
`payload`	No
`request`	No
`verdict`	No
`envelope`	No
`evidence`	No
`failures`	No
`response`	No
`schedule`	No
`warnings`	No
`next_unix`	No
`environment`	No
`last_run_id`	No
`last_status`	No
`source_line`	No
`created_unix`	No
`forwarded_to`	No
`welcome_back`	No
`chain_dry_run`	No
`exception_class`	No
`inputs_required`	No
`last_fired_unix`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed154 schema fields changedOct 16, 2026
- changedOutput schema / properties / args / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- changedOutput schema / properties / chain_dry_run / type
```
Previous value: -"boolean"New value: +[
+  "boolean",
+  "null"
+]
```
- changedOutput schema / properties / changed / type
```
Previous value: -"array"New value: +[
+  "array",
+  "null"
+]
```
- changedOutput schema / properties / created / type
```
Previous value: -"boolean"New value: +[
+  "boolean",
+  "null"
+]
```
- changedOutput schema / properties / created_unix / type
```
Previous value: -"integer"New value: +[
+  "integer",
+  "null"
+]
```
- changedOutput schema / properties / detail / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / dry_run / properties / delivered / type
```
Previous value: -"boolean"New value: +[
+  "boolean",
+  "null"
+]
```
- changedOutput schema / properties / dry_run / properties / rolled_back / type
```
Previous value: -"boolean"New value: +[
+  "boolean",
+  "null"
+]
```
- changedOutput schema / properties / dry_run / properties / writes / items / properties / channel / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / dry_run / properties / writes / items / properties / op / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / dry_run / properties / writes / items / properties / rows / type
```
Previous value: -"integer"New value: +[
+  "integer",
+  "null"
+]
```
- changedOutput schema / properties / dry_run / properties / writes / items / properties / store / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / dry_run / properties / writes / type
```
Previous value: -"array"New value: +[
+  "array",
+  "null"
+]
```
- changedOutput schema / properties / enabled / type
```
Previous value: -"boolean"New value: +[
+  "boolean",
+  "null"
+]
```
- changedOutput schema / properties / envelope / properties / declared / type
```
Previous value: -"array"New value: +[
+  "array",
+  "null"
+]
```
- changedOutput schema / properties / envelope / properties / found_at_contract_path / type
```
Previous value: -"array"New value: +[
+  "array",
+  "null"
+]
```
- changedOutput schema / properties / envelope / properties / green / type
```
Previous value: -"boolean"New value: +[
+  "boolean",
+  "null"
+]
```
- changedOutput schema / properties / envelope / properties / missing / type
```
Previous value: -"array"New value: +[
+  "array",
+  "null"
+]
```
- changedOutput schema / properties / envelope / properties / missing_detail / items / properties / name / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / envelope / properties / missing_detail / items / properties / path / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / envelope / properties / missing_detail / items / properties / seen_at / type
```
Previous value: -"array"New value: +[
+  "array",
+  "null"
+]
```
- changedOutput schema / properties / envelope / properties / missing_detail / type
```
Previous value: -"array"New value: +[
+  "array",
+  "null"
+]
```
- changedOutput schema / properties / envelope / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- changedOutput schema / properties / environment / items / properties / kind / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / environment / items / properties / name / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / environment / items / properties / value / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / environment / type
```
Previous value: -"array"New value: +[
+  "array",
+  "null"
+]
```
- changedOutput schema / properties / error / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / evidence / items / properties / available / type
```
Previous value: -"array"New value: +[
+  "array",
+  "null"
+]
```
- changedOutput schema / properties / evidence / items / properties / did_you_mean / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / evidence / items / properties / path / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / evidence / items / properties / predecessor_keys / type
```
Previous value: -"array"New value: +[
+  "array",
+  "null"
+]
```
- changedOutput schema / properties / evidence / items / properties / step / type
```
Previous value: -"integer"New value: +[
+  "integer",
+  "null"
+]
```
- changedOutput schema / properties / evidence / type
```
Previous value: -"array"New value: +[
+  "array",
+  "null"
+]
```
- changedOutput schema / properties / exception_class / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / failures / items / properties / available / type
```
Previous value: -"array"New value: +[
+  "array",
+  "null"
+]
```
- changedOutput schema / properties / failures / items / properties / did_you_mean / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / failures / items / properties / path / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / failures / items / properties / predecessor_keys / type
```
Previous value: -"array"New value: +[
+  "array",
+  "null"
+]
```
- changedOutput schema / properties / failures / items / properties / step / type
```
Previous value: -"integer"New value: +[
+  "integer",
+  "null"
+]
```
- changedOutput schema / properties / failures / type
```
Previous value: -"array"New value: +[
+  "array",
+  "null"
+]
```
- changedOutput schema / properties / forwarded_to / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / id / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / inputs_required / type
```
Previous value: -"array"New value: +[
+  "array",
+  "null"
+]
```
- changedOutput schema / properties / kind / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- removedOutput schema / properties / last_fired_unix / type
```
Removed value: -"null"
```
- removedOutput schema / properties / last_run_id / type
```
Removed value: -"null"
```
- removedOutput schema / properties / last_status / type
```
Removed value: -"null"
```
- changedOutput schema / properties / line / type
```
Previous value: -"integer"New value: +[
+  "integer",
+  "null"
+]
```
- changedOutput schema / properties / msg / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / name / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / next / properties / tool / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / next / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- changedOutput schema / properties / next_unix / type
```
Previous value: -"integer"New value: +[
+  "integer",
+  "null"
+]
```
- changedOutput schema / properties / ok / type
```
Previous value: -"boolean"New value: +[
+  "boolean",
+  "null"
+]
```
- changedOutput schema / properties / outer / properties / tenant_key / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / outer / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- changedOutput schema / properties / payload / properties / msg / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / payload / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- changedOutput schema / properties / reason / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- removedOutput schema / properties / request / properties / body / type
```
Removed value: -"null"
```
- changedOutput schema / properties / request / properties / headers / properties / x-api-key / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / request / properties / headers / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- changedOutput schema / properties / request / properties / method / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / request / properties / query / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- changedOutput schema / properties / request / properties / url / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / request / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- changedOutput schema / properties / response / properties / body / properties / blocking_tool / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / response / properties / body / properties / fact / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / response / properties / body / properties / json / properties / bridge_status / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / response / properties / body / properties / json / properties / ingestion_status / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / response / properties / body / properties / json / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- changedOutput schema / properties / response / properties / body / properties / length / type
```
Previous value: -"integer"New value: +[
+  "integer",
+  "null"
+]
```
- changedOutput schema / properties / response / properties / body / properties / ok / type
```
Previous value: -"boolean"New value: +[
+  "boolean",
+  "null"
+]
```
- changedOutput schema / properties / response / properties / body / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- changedOutput schema / properties / response / properties / headers / properties / content-type / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / response / properties / headers / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- changedOutput schema / properties / response / properties / payload / properties / blocking_tool / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / response / properties / payload / properties / fact / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / response / properties / payload / properties / json / properties / bridge_status / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / response / properties / payload / properties / json / properties / ingestion_status / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / response / properties / payload / properties / json / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- changedOutput schema / properties / response / properties / payload / properties / length / type
```
Previous value: -"integer"New value: +[
+  "integer",
+  "null"
+]
```
- changedOutput schema / properties / response / properties / payload / properties / ok / type
```
Previous value: -"boolean"New value: +[
+  "boolean",
+  "null"
+]
```
- changedOutput schema / properties / response / properties / payload / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- changedOutput schema / properties / response / properties / status / type
```
Previous value: -"integer"New value: +[
+  "integer",
+  "null"
+]
```
- changedOutput schema / properties / response / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- removedOutput schema / properties / result / properties / a / type
```
Removed value: -"null"
```
- changedOutput schema / properties / result / properties / appended / type
```
Previous value: -"integer"New value: +[
+  "integer",
+  "null"
+]
```
- removedOutput schema / properties / result / properties / b / type
```
Removed value: -"null"
```
- changedOutput schema / properties / result / properties / city / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / result / properties / data / properties / status / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / result / properties / data / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- changedOutput schema / properties / result / properties / delivered / type
```
Previous value: -"boolean"New value: +[
+  "boolean",
+  "null"
+]
```
- changedOutput schema / properties / result / properties / n / type
```
Previous value: -"integer"New value: +[
+  "integer",
+  "null"
+]
```
- changedOutput schema / properties / result / properties / ok / type
```
Previous value: -"boolean"New value: +[
+  "boolean",
+  "null"
+]
```
- changedOutput schema / properties / result / properties / payload / properties / data / properties / status / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / result / properties / payload / properties / data / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- changedOutput schema / properties / result / properties / payload / properties / ingestion_status / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / result / properties / payload / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- changedOutput schema / properties / result / properties / table / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / result / properties / total / type
```
Previous value: -"integer"New value: +[
+  "integer",
+  "null"
+]
```
- changedOutput schema / properties / result / properties / would_post / properties / body / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / result / properties / would_post / properties / channel / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / result / properties / would_post / properties / data / properties / n / type
```
Previous value: -"integer"New value: +[
+  "integer",
+  "null"
+]
```
- changedOutput schema / properties / result / properties / would_post / properties / data / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- changedOutput schema / properties / result / properties / would_post / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- changedOutput schema / properties / result / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- changedOutput schema / properties / schedule / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / schema / properties / properties / properties / cid / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- changedOutput schema / properties / schema / properties / properties / properties / city / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- changedOutput schema / properties / schema / properties / properties / properties / note / properties / default / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / schema / properties / properties / properties / note / properties / type / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / schema / properties / properties / properties / note / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- changedOutput schema / properties / schema / properties / properties / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- changedOutput schema / properties / schema / properties / required / type
```
Previous value: -"array"New value: +[
+  "array",
+  "null"
+]
```
- changedOutput schema / properties / schema / properties / type / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / schema / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- changedOutput schema / properties / source_line / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / state / properties / keys / type
```
Previous value: -"array"New value: +[
+  "array",
+  "null"
+]
```
- changedOutput schema / properties / state / properties / reads / type
```
Previous value: -"integer"New value: +[
+  "integer",
+  "null"
+]
```
- changedOutput schema / properties / state / properties / tables / type
```
Previous value: -"array"New value: +[
+  "array",
+  "null"
+]
```
- changedOutput schema / properties / state / properties / writes / type
```
Previous value: -"integer"New value: +[
+  "integer",
+  "null"
+]
```
- changedOutput schema / properties / state / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- changedOutput schema / properties / steps / items / properties / dispatched / type
```
Previous value: -"boolean"New value: +[
+  "boolean",
+  "null"
+]
```
- changedOutput schema / properties / steps / items / properties / error / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / steps / items / properties / prev_fields / type
```
Previous value: -"array"New value: +[
+  "array",
+  "null"
+]
```
- changedOutput schema / properties / steps / items / properties / resolved / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / steps / items / properties / resolved_args / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- changedOutput schema / properties / steps / items / properties / result / properties / a / type
```
Previous value: -"integer"New value: +[
+  "integer",
+  "null"
+]
```
- changedOutput schema / properties / steps / items / properties / result / properties / appended / type
```
Previous value: -"integer"New value: +[
+  "integer",
+  "null"
+]
```
- changedOutput schema / properties / steps / items / properties / result / properties / ids / type
```
Previous value: -"array"New value: +[
+  "array",
+  "null"
+]
```
- changedOutput schema / properties / steps / items / properties / result / properties / leads / type
```
Previous value: -"array"New value: +[
+  "array",
+  "null"
+]
```
- changedOutput schema / properties / steps / items / properties / result / properties / owner / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / steps / items / properties / result / properties / rows / type
```
Previous value: -"array"New value: +[
+  "array",
+  "null"
+]
```
- changedOutput schema / properties / steps / items / properties / result / properties / table / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / steps / items / properties / result / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- changedOutput schema / properties / steps / items / properties / side_effects / type
```
Previous value: -"boolean"New value: +[
+  "boolean",
+  "null"
+]
```
- changedOutput schema / properties / steps / items / properties / step / type
```
Previous value: -"integer"New value: +[
+  "integer",
+  "null"
+]
```
- changedOutput schema / properties / steps / items / properties / tool / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / steps / type
```
Previous value: -"array"New value: +[
+  "array",
+  "null"
+]
```
- changedOutput schema / properties / tool / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- removedOutput schema / properties / tz / type
```
Removed value: -"null"
```
- changedOutput schema / properties / verdict / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / warnings / type
```
Previous value: -"array"New value: +[
+  "array",
+  "null"
+]
```
- removedOutput schema / properties / welcome_back / properties / last_note / type
```
Removed value: -"null"
```
- changedOutput schema / properties / welcome_back / properties / last_seen / type
```
Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
```
- changedOutput schema / properties / welcome_back / properties / notes / type
```
Previous value: -"integer"New value: +[
+  "integer",
+  "null"
+]
```
- changedOutput schema / properties / welcome_back / properties / since_you_left / properties / calls / type
```
Previous value: -"integer"New value: +[
+  "integer",
+  "null"
+]
```
- changedOutput schema / properties / welcome_back / properties / since_you_left / properties / days / type
```
Previous value: -"integer"New value: +[
+  "integer",
+  "null"
+]
```
- changedOutput schema / properties / welcome_back / properties / since_you_left / properties / inbox / type
```
Previous value: -"integer"New value: +[
+  "integer",
+  "null"
+]
```
- changedOutput schema / properties / welcome_back / properties / since_you_left / properties / runs / type
```
Previous value: -"integer"New value: +[
+  "integer",
+  "null"
+]
```
- changedOutput schema / properties / welcome_back / properties / since_you_left / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
- changedOutput schema / properties / welcome_back / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```

Changed2 schema fields changedOct 14, 2026

changedInput schema / properties / args / description

Previous value: -"Arguments to pass, same shape as a real call."New value: +"Arguments to pass, same shape as a real call. Omit to run one example generated from the tool's args_schema; the response then carries example_args (what ran) and untyped (keys the schema gave no type for)."

changedInput schema / required

Previous value: -[
-  "name",
-  "args"
-]New value: +[
+  "name"
+]

Changed1 schema field changedOct 12, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "properties": {
+    "args": {
+      "properties": {},
+      "type": "object"
+    },
+    "chain_dry_run": {
+      "type": "boolean"
+    },
+    "changed": {
+      "type": "array"
+    },
+    "created": {
+      "type": "boolean"
+    },
+    "created_unix": {
+      "type": "integer"
+    },
+    "detail": {
+      "type": "string"
+    },
+    "dry_run": {
+      "properties": {
+        "delivered": {
+          "type": "boolean"
+        },
+        "rolled_back": {
+          "type": "boolean"
+        },
+        "writes": {
+          "items": {
+            "properties": {
+              "channel": {
+                "type": "string"
+              },
+              "key": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "op": {
+                "type": "string"
+              },
+              "rows": {
+                "type": "integer"
+              },
+              "store": {
+                "type": "string"
+              },
+              "table": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              }
+            },
+            "type": "object"
+          },
+          "type": "array"
+        }
+      },
+      "type": "object"
+    },
+    "enabled": {
+      "type": "boolean"
+    },
+    "envelope": {
+      "properties": {
+        "declared": {
+          "items": {
+            "type": "string"
+          },
+          "type": "array"
+        },
+        "found_at_contract_path": {
+          "items": {
+            "type": "string"
+          },
+          "type": "array"
+        },
+        "green": {
+          "type": "boolean"
+        },
+        "missing": {
+          "items": {
+            "type": "string"
+          },
+          "type": "array"
+        },
+        "missing_detail": {
+          "items": {
+            "properties": {
+              "name": {
+                "type": "string"
+              },
+              "path": {
+                "type": "string"
+              },
+              "seen_at": {
+                "type": "array"
+              }
+            },
+            "type": "object"
+          },
+          "type": "array"
+        }
+      },
+      "type": "object"
+    },
+    "environment": {
+      "items": {
+        "properties": {
+          "kind": {
+            "type": "string"
+          },
+          "name": {
+            "type": "string"
+          },
+          "value": {
+            "type": "string"
+          }
+        },
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "error": {
+      "type": "string"
+    },
+    "evidence": {
+      "items": {
+        "properties": {
+          "available": {
+            "items": {
+              "type": "string"
+            },
+            "type": "array"
+          },
+          "did_you_mean": {
+            "type": "string"
+          },
+          "path": {
+            "type": "string"
+          },
+          "predecessor_keys": {
+            "items": {
+              "type": "string"
+            },
+            "type": "array"
+          },
+          "step": {
+            "type": "integer"
+          }
+        },
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "exception_class": {
+      "type": "string"
+    },
+    "failures": {
+      "items": {
+        "properties": {
+          "available": {
+            "items": {
+              "type": "string"
+            },
+            "type": "array"
+          },
+          "did_you_mean": {
+            "type": "string"
+          },
+          "path": {
+            "type": "string"
+          },
+          "predecessor_keys": {
+            "items": {
+              "type": "string"
+            },
+            "type": "array"
+          },
+          "step": {
+            "type": "integer"
+          }
+        },
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "forwarded_to": {
+      "type": "string"
+    },
+    "id": {
+      "type": "string"
+    },
+    "inputs_required": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "kind": {
+      "type": "string"
+    },
+    "last_fired_unix": {
+      "type": "null"
+    },
+    "last_run_id": {
+      "type": "null"
+    },
+    "last_status": {
+      "type": "null"
+    },
+    "line": {
+      "type": "integer"
+    },
+    "msg": {
+      "type": "string"
+    },
+    "name": {
+      "type": "string"
+    },
+    "next": {
+      "properties": {
+        "tool": {
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "next_unix": {
+      "type": "integer"
+    },
+    "ok": {
+      "type": "boolean"
+    },
+    "outer": {
+      "properties": {
+        "tenant_key": {
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "payload": {
+      "properties": {
+        "msg": {
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "reason": {
+      "type": "string"
+    },
+    "request": {
+      "properties": {
+        "body": {
+          "type": "null"
+        },
+        "headers": {
+          "properties": {
+            "x-api-key": {
+              "type": "string"
+            }
+          },
+          "type": "object"
+        },
+        "method": {
+          "type": "string"
+        },
+        "query": {
+          "properties": {},
+          "type": "object"
+        },
+        "url": {
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "response": {
+      "properties": {
+        "body": {
+          "properties": {
+            "blocking_tool": {
+              "type": "string"
+            },
+            "fact": {
+              "type": "string"
+            },
+            "json": {
+              "properties": {
+                "bridge_status": {
+                  "type": "string"
+                },
+                "ingestion_status": {
+                  "type": "string"
+                }
+              },
+              "type": "object"
+            },
+            "length": {
+              "type": "integer"
+            },
+            "ok": {
+              "type": "boolean"
+            }
+          },
+          "type": "object"
+        },
+        "headers": {
+          "properties": {
+            "content-type": {
+              "type": "string"
+            }
+          },
+          "type": "object"
+        },
+        "payload": {
+          "properties": {
+            "blocking_tool": {
+              "type": "string"
+            },
+            "fact": {
+              "type": "string"
+            },
+            "json": {
+              "properties": {
+                "bridge_status": {
+                  "type": "string"
+                },
+                "ingestion_status": {
+                  "type": "string"
+                }
+              },
+              "type": "object"
+            },
+            "length": {
+              "type": "integer"
+            },
+            "ok": {
+              "type": "boolean"
+            }
+          },
+          "type": "object"
+        },
+        "status": {
+          "type": "integer"
+        }
+      },
+      "type": "object"
+    },
+    "result": {
+      "properties": {
+        "a": {
+          "type": "null"
+        },
+        "appended": {
+          "type": "integer"
+        },
+        "b": {
+          "type": "null"
+        },
+        "city": {
+          "type": "string"
+        },
+        "data": {
+          "properties": {
+            "status": {
+              "type": "string"
+            }
+          },
+          "type": "object"
+        },
+        "delivered": {
+          "type": "boolean"
+        },
+        "n": {
+          "type": "integer"
+        },
+        "ok": {
+          "type": "boolean"
+        },
+        "payload": {
+          "properties": {
+            "data": {
+              "properties": {
+                "status": {
+                  "type": "string"
+                }
+              },
+              "type": "object"
+            },
+            "ingestion_status": {
+              "type": "string"
+            }
+          },
+          "type": "object"
+        },
+        "table": {
+          "type": "string"
+        },
+        "total": {
+          "type": "integer"
+        },
+        "would_post": {
+          "properties": {
+            "body": {
+              "type": "string"
+            },
+            "channel": {
+              "type": "string"
+            },
+            "data": {
+              "properties": {
+                "n": {
+                  "type": "integer"
+                }
+              },
+              "type": "object"
+            }
+          },
+          "type": "object"
+        }
+      },
+      "type": "object"
+    },
+    "schedule": {
+      "type": "string"
+    },
+    "schema": {
+      "properties": {
+        "properties": {
+          "properties": {
+            "cid": {
+              "properties": {},
+              "type": "object"
+            },
+            "city": {
+              "properties": {},
+              "type": "object"
+            },
+            "note": {
+              "properties": {
+                "default": {
+                  "type": "string"
+                },
+                "type": {
+                  "type": "string"
+                }
+              },
+              "type": "object"
+            }
+          },
+          "type": "object"
+        },
+        "required": {
+          "items": {
+            "type": "string"
+          },
+          "type": "array"
+        },
+        "type": {
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "source_line": {
+      "type": "string"
+    },
+    "state": {
+      "properties": {
+        "keys": {
+          "items": {
+            "type": "string"
+          },
+          "type": "array"
+        },
+        "reads": {
+          "type": "integer"
+        },
+        "tables": {
+          "items": {
+            "type": "string"
+          },
+          "type": "array"
+        },
+        "writes": {
+          "type": "integer"
+        }
+      },
+      "type": "object"
+    },
+    "steps": {
+      "items": {
+        "properties": {
+          "dispatched": {
+            "type": "boolean"
+          },
+          "error": {
+            "type": "string"
+          },
+          "prev_fields": {
+            "items": {
+              "type": "string"
+            },
+            "type": "array"
+          },
+          "resolved": {
+            "type": "string"
+          },
+          "resolved_args": {
+            "type": "object"
+          },
+          "result": {
+            "properties": {
+              "a": {
+                "type": "integer"
+              },
+              "appended": {
+                "type": "integer"
+              },
+              "ids": {
+                "type": "array"
+              },
+              "leads": {
+                "type": "array"
+              },
+              "owner": {
+                "type": "string"
+              },
+              "rows": {
+                "type": "array"
+              },
+              "table": {
+                "type": "string"
+              }
+            },
+            "type": "object"
+          },
+          "side_effects": {
+            "type": "boolean"
+          },
+          "step": {
+            "type": "integer"
+          },
+          "tool": {
+            "type": "string"
+          }
+        },
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "tool": {
+      "type": "string"
+    },
+    "tz": {
+      "type": "null"
+    },
+    "verdict": {
+      "type": "string"
+    },
+    "warnings": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "welcome_back": {
+      "properties": {
+        "last_note": {
+          "type": "null"
+        },
+        "last_seen": {
+          "type": "string"
+        },
+        "notes": {
+          "type": "integer"
+        },
+        "since_you_left": {
+          "properties": {
+            "calls": {
+              "type": "integer"
+            },
+            "days": {
+              "type": "integer"
+            },
+            "inbox": {
+              "type": "integer"
+            },
+            "runs": {
+              "type": "integer"
+            }
+          },
+          "type": "object"
+        }
+      },
+      "type": "object"
+    }
+  },
+  "required": [
+    "dry_run"
+  ],
+  "type": "object"
+}

Changed1 schema field changedOct 11, 2026

addedInput schema / properties / fixtures

Added value: +{
+  "description": "Chain tools only: {\"<step number or tool name>\": <recorded result>}. A fixtured step executes nothing (no upstream call); later mappings resolve against it. host.runs.get(run_id, as_fixtures=true) exports a real run in this shape.",
+  "type": "object"
+}

Changed1 schema field changedOct 4, 2026

changedInput schema / properties / tenant_key / description

Previous value: -"The key `signup` returned. Optional on the connection that ran signup (or host.redeem): that connection is already bound to the tenant it created, so later calls on it need no tenant_key. Required only when this connection carries no Authorization: Bearer header and never ran signup -- when both a header and this argument are present, the header wins. Omitting it on such a connection returns tenant_key_missing (-32602)."New value: +"The key `signup` returned. Optional on the connection that ran signup (or host.redeem): that connection is already bound to the tenant it created, so later calls on it need no tenant_key. On a connection with no Authorization: Bearer header and no prior signup, omitting it implicitly signs that connection up as a brand-new tenant and runs this call as it -- see host.whoami's source field. When both a header and this argument are present, the header wins."

Changed1 schema field changedOct 4, 2026

addedInput schema / x-deprecated

Added value: +{
+  "replaced_by": "host.tool.test",
+  "sunset": "2026-12-31"
+}

Changed1 schema field changedOct 3, 2026
- addedInput schema / additionalProperties
```
Added value: +false
```

Changed1 schema field changedSep 30, 2026

changedInput schema / properties / tenant_key / description

Previous value: -"The key `signup` returned. Required only when this connection carries no Authorization: Bearer header -- when both are present, the header wins. Omitting it on a connection with no header returns tenant_key_missing (-32602)."New value: +"The key `signup` returned. Optional on the connection that ran signup (or host.redeem): that connection is already bound to the tenant it created, so later calls on it need no tenant_key. Required only when this connection carries no Authorization: Bearer header and never ran signup -- when both a header and this argument are present, the header wins. Omitting it on such a connection returns tenant_key_missing (-32602)."

Changed1 schema field changedSep 30, 2026

changedInput schema / properties / tenant_key / description

Previous value: -"The key `signup` returned. Required only when this connection carries no Authorization: Bearer header -- when both are present, the header wins."New value: +"The key `signup` returned. Required only when this connection carries no Authorization: Bearer header -- when both are present, the header wins. Omitting it on a connection with no header returns tenant_key_missing (-32602)."

Changed2 schema fields changedSep 11, 2026
- addedInput schema / properties / args / description
```
Added value: +"Arguments to pass, same shape as a real call."
```
- addedInput schema / properties / name / description
```
Added value: +"Local name of the already-published tool to dry-run."
```
First observedSep 6, 2026

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