Robot Actions — Remote Device Control

Android DevTools mock add

android_devtools_mock_add

Add (or update in place, when id matches an existing route) a mock/abort rule for Chrome/WebView requests on this device. mode "mock" (default) serves the given status/headers/body without the request leaving the device; mode "abort" fails it so the page sees a network error. Routes apply immediately and survive navigation. WEB CONTENT ONLY: this intercepts requests made by browser/WebView pages. Requests made by native app code are NOT intercepted and never will be by this tool. Nothing device-wide is changed and no certificate is installed — the effect is scoped to the page. For requests made by native app code use android_traffic_mock_add instead.

Input Schema

TableJSON Schema

Name	Required	Description
`id`	No	Route id to update in place; omit to auto-generate a new one
`body`	No	Response body for mode "mock" (text, or base64 when bodyEncoding is "base64")
`mode`	No	"mock" serves a canned response (default); "abort" fails the request
`udid`	Yes	Device id (Android serial or iOS UDID)
`method`	No	Optional HTTP method filter (e.g. "GET"/"POST"); matches any method when omitted
`pageId`	No	Pin routing to a specific page id (from the *_list_pages tool). Omit to follow the active page automatically across navigations and new tabs — recommended.
`socket`	No	Abstract unix socket name (default: chrome_devtools_remote)
`status`	No	HTTP status to serve for mode "mock" (default 200)
`delayMs`	No	Latency injected before responding/failing, in ms (clamped to 60s)
`enabled`	No	Whether the route is active (default true) — disabled routes are kept but ignored
`headers`	No	Response headers for mode "mock", as {headerName: value} — e.g. {"content-type": "application/json"}. On iOS a `charset` in content-type is NOT applied to the response: an HTML body with non-ASCII characters must declare it in the document (e.g. <meta charset="utf-8">) or it will be decoded with the default encoding and render as mojibake.
`matchUrl`	Yes	URL pattern to match against the request's full URL
`matchType`	No	How matchUrl is interpreted against the request URL (default "contains")
`bodyEncoding`	No	Encoding of `body` (default "text")

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedAug 18, 2026

changedInput schema / properties / headers / description

Previous value: -"Response headers for mode \"mock\", as {headerName: value} — e.g. {\"content-type\": \"application/json\"}"New value: +"Response headers for mode \"mock\", as {headerName: value} — e.g. {\"content-type\": \"application/json\"}. On iOS a `charset` in content-type is NOT applied to the response: an HTML body with non-ASCII characters must declare it in the document (e.g. <meta charset=\"utf-8\">) or it will be decoded with the default encoding and render as mojibake."

AddedAug 9, 2026

TDQS

A4.6/5.0

Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Goes well beyond the annotations: routes apply immediately, survive navigation, nothing is changed device-wide, no certificate is installed, and the effect is scoped to the page. It also clarifies the update-in-place semantics when an id matches. This is exactly the kind of side-effect and scope disclosure a mutation tool needs.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Front-loads the core action and then layers the constraints in ordered sentences with a clear WEB CONTENT ONLY callout. It is dense but every sentence carries information; slightly long, but appropriately so for a 14-parameter tool.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given 14 parameters, rich annotations, and no output schema, the description covers scope, effect lifetime, mode semantics, and the sibling alternative. Nothing an agent needs in order to call it correctly is missing.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the schema already documents all 14 parameters with enums and defaults. The description reinforces the meaning of mode and id but adds no syntax or format detail beyond what the schema provides, so the baseline 3 applies.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb (add/update-in-place) and resource (a mock/abort routing rule) and immediately names the scope (Chrome/WebView requests on this device). It also explicitly distinguishes itself from the sibling android_traffic_mock_add, so an agent can tell the two apart without opening either schema.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Explicitly says when to use each mode (mock serves a canned response, abort fails the request) and when NOT to use this tool, routing the agent to android_traffic_mock_add for native app code. The alternative and its selecting condition are named outright.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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