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import type {
ToolResultBlockParam,
ToolUseBlockParam,
} from '@anthropic-ai/sdk/resources/index.mjs'
import type {
ElicitRequestURLParams,
ElicitResult,
} from '@modelcontextprotocol/sdk/types.js'
import type { UUID } from 'crypto'
import type { z } from 'zod/v4'
import type { Command } from './commands.js'
import type { CanUseToolFn } from './hooks/useCanUseTool.js'
import type { ThinkingConfig } from './utils/thinking.js'
export type ToolInputJSONSchema = {
[x: string]: unknown
type: 'object'
properties?: {
[x: string]: unknown
}
}
import type { Notification } from './context/notifications.js'
import type {
MCPServerConnection,
ServerResource,
} from './services/mcp/types.js'
import type {
AgentDefinition,
AgentDefinitionsResult,
} from './tools/AgentTool/loadAgentsDir.js'
import type {
AssistantMessage,
AttachmentMessage,
Message,
ProgressMessage,
SystemLocalCommandMessage,
SystemMessage,
UserMessage,
} from './types/message.js'
// Import permission types from centralized location to break import cycles
// Import PermissionResult from centralized location to break import cycles
import type {
AdditionalWorkingDirectory,
PermissionMode,
PermissionResult,
} from './types/permissions.js'
// Import tool progress types from centralized location to break import cycles
import type {
AgentToolProgress,
BashProgress,
MCPProgress,
REPLToolProgress,
SkillToolProgress,
TaskOutputProgress,
ToolProgressData,
WebSearchProgress,
} from './types/tools.js'
import type { FileStateCache } from './utils/fileStateCache.js'
import type { DenialTrackingState } from './utils/permissions/denialTracking.js'
import type { SystemPrompt } from './utils/systemPromptType.js'
import type { ContentReplacementState } from './utils/toolResultStorage.js'
// Re-export progress types for backwards compatibility
export type {
AgentToolProgress,
BashProgress,
MCPProgress,
REPLToolProgress,
SkillToolProgress,
TaskOutputProgress,
WebSearchProgress,
}
import type { SpinnerMode } from './components/Spinner.js'
import type { QuerySource } from './constants/querySource.js'
import type { SDKStatus } from './entrypoints/agentSdkTypes.js'
import type { AppState } from './state/AppState.js'
import type {
HookProgress,
PromptRequest,
PromptResponse,
} from './types/hooks.js'
import type { AgentId } from './types/ids.js'
import type { DeepImmutable } from './types/utils.js'
import type { AttributionState } from './utils/commitAttribution.js'
import type { FileHistoryState } from './utils/fileHistory.js'
import type { Theme, ThemeName } from './utils/theme.js'
export type QueryChainTracking = {
chainId: string
depth: number
}
export type ValidationResult =
| { result: true }
| {
result: false
message: string
errorCode: number
}
export type SetToolJSXFn = (
args: {
jsx: React.ReactNode | null
shouldHidePromptInput: boolean
shouldContinueAnimation?: true
showSpinner?: boolean
isLocalJSXCommand?: boolean
isImmediate?: boolean
/** Set to true to clear a local JSX command (e.g., from its onDone callback) */
clearLocalJSX?: boolean
} | null,
) => void
// Import tool permission types from centralized location to break import cycles
import type { ToolPermissionRulesBySource } from './types/permissions.js'
// Re-export for backwards compatibility
export type { ToolPermissionRulesBySource }
// Apply DeepImmutable to the imported type
export type ToolPermissionContext = DeepImmutable<{
mode: PermissionMode
additionalWorkingDirectories: Map<string, AdditionalWorkingDirectory>
alwaysAllowRules: ToolPermissionRulesBySource
alwaysDenyRules: ToolPermissionRulesBySource
alwaysAskRules: ToolPermissionRulesBySource
isBypassPermissionsModeAvailable: boolean
isAutoModeAvailable?: boolean
strippedDangerousRules?: ToolPermissionRulesBySource
/** When true, permission prompts are auto-denied (e.g., background agents that can't show UI) */
shouldAvoidPermissionPrompts?: boolean
/** When true, automated checks (classifier, hooks) are awaited before showing the permission dialog (coordinator workers) */
awaitAutomatedChecksBeforeDialog?: boolean
/** Stores the permission mode before model-initiated plan mode entry, so it can be restored on exit */
prePlanMode?: PermissionMode
}>
export const getEmptyToolPermissionContext: () => ToolPermissionContext =
() => ({
mode: 'default',
additionalWorkingDirectories: new Map(),
alwaysAllowRules: {},
alwaysDenyRules: {},
alwaysAskRules: {},
isBypassPermissionsModeAvailable: false,
})
export type CompactProgressEvent =
| {
type: 'hooks_start'
hookType: 'pre_compact' | 'post_compact' | 'session_start'
}
| { type: 'compact_start' }
| { type: 'compact_end' }
export type ToolUseContext = {
options: {
commands: Command[]
debug: boolean
mainLoopModel: string
tools: Tools
verbose: boolean
thinkingConfig: ThinkingConfig
mcpClients: MCPServerConnection[]
mcpResources: Record<string, ServerResource[]>
isNonInteractiveSession: boolean
agentDefinitions: AgentDefinitionsResult
maxBudgetUsd?: number
/** Custom system prompt that replaces the default system prompt */
customSystemPrompt?: string
/** Additional system prompt appended after the main system prompt */
appendSystemPrompt?: string
/** Override querySource for analytics tracking */
querySource?: QuerySource
/** Optional callback to get the latest tools (e.g., after MCP servers connect mid-query) */
refreshTools?: () => Tools
}
abortController: AbortController
readFileState: FileStateCache
getAppState(): AppState
setAppState(f: (prev: AppState) => AppState): void
/**
* Always-shared setAppState for session-scoped infrastructure (background
* tasks, session hooks). Unlike setAppState, which is no-op for async agents
* (see createSubagentContext), this always reaches the root store so agents
* at any nesting depth can register/clean up infrastructure that outlives
* a single turn. Only set by createSubagentContext; main-thread contexts
* fall back to setAppState.
*/
setAppStateForTasks?: (f: (prev: AppState) => AppState) => void
/**
* Optional handler for URL elicitations triggered by tool call errors (-32042).
* In print/SDK mode, this delegates to structuredIO.handleElicitation.
* In REPL mode, this is undefined and the queue-based UI path is used.
*/
handleElicitation?: (
serverName: string,
params: ElicitRequestURLParams,
signal: AbortSignal,
) => Promise<ElicitResult>
setToolJSX?: SetToolJSXFn
addNotification?: (notif: Notification) => void
/** Append a UI-only system message to the REPL message list. Stripped at the
* normalizeMessagesForAPI boundary — the Exclude<> makes that type-enforced. */
appendSystemMessage?: (
msg: Exclude<SystemMessage, SystemLocalCommandMessage>,
) => void
/** Send an OS-level notification (iTerm2, Kitty, Ghostty, bell, etc.) */
sendOSNotification?: (opts: {
message: string
notificationType: string
}) => void
nestedMemoryAttachmentTriggers?: Set<string>
/**
* CLAUDE.md paths already injected as nested_memory attachments this
* session. Dedup for memoryFilesToAttachments — readFileState is an LRU
* that evicts entries in busy sessions, so its .has() check alone can
* re-inject the same CLAUDE.md dozens of times.
*/
loadedNestedMemoryPaths?: Set<string>
dynamicSkillDirTriggers?: Set<string>
/** Skill names surfaced via skill_discovery this session. Telemetry only (feeds was_discovered). */
discoveredSkillNames?: Set<string>
userModified?: boolean
setInProgressToolUseIDs: (f: (prev: Set<string>) => Set<string>) => void
/** Only wired in interactive (REPL) contexts; SDK/QueryEngine don't set this. */
setHasInterruptibleToolInProgress?: (v: boolean) => void
setResponseLength: (f: (prev: number) => number) => void
/** Ant-only: push a new API metrics entry for OTPS tracking.
* Called by subagent streaming when a new API request starts. */
pushApiMetricsEntry?: (ttftMs: number) => void
setStreamMode?: (mode: SpinnerMode) => void
onCompactProgress?: (event: CompactProgressEvent) => void
setSDKStatus?: (status: SDKStatus) => void
openMessageSelector?: () => void
updateFileHistoryState: (
updater: (prev: FileHistoryState) => FileHistoryState,
) => void
updateAttributionState: (
updater: (prev: AttributionState) => AttributionState,
) => void
setConversationId?: (id: UUID) => void
agentId?: AgentId // Only set for subagents; use getSessionId() for session ID. Hooks use this to distinguish subagent calls.
agentType?: string // Subagent type name. For the main thread's --agent type, hooks fall back to getMainThreadAgentType().
/** When true, canUseTool must always be called even when hooks auto-approve.
* Used by speculation for overlay file path rewriting. */
requireCanUseTool?: boolean
messages: Message[]
fileReadingLimits?: {
maxTokens?: number
maxSizeBytes?: number
}
globLimits?: {
maxResults?: number
}
toolDecisions?: Map<
string,
{
source: string
decision: 'accept' | 'reject'
timestamp: number
}
>
queryTracking?: QueryChainTracking
/** Callback factory for requesting interactive prompts from the user.
* Returns a prompt callback bound to the given source name.
* Only available in interactive (REPL) contexts. */
requestPrompt?: (
sourceName: string,
toolInputSummary?: string | null,
) => (request: PromptRequest) => Promise<PromptResponse>
toolUseId?: string
criticalSystemReminder_EXPERIMENTAL?: string
/** When true, preserve toolUseResult on messages even for subagents.
* Used by in-process teammates whose transcripts are viewable by the user. */
preserveToolUseResults?: boolean
/** Local denial tracking state for async subagents whose setAppState is a
* no-op. Without this, the denial counter never accumulates and the
* fallback-to-prompting threshold is never reached. Mutable — the
* permissions code updates it in place. */
localDenialTracking?: DenialTrackingState
/**
* Per-conversation-thread content replacement state for the tool result
* budget. When present, query.ts applies the aggregate tool result budget.
* Main thread: REPL provisions once (never resets — stale UUID keys
* are inert). Subagents: createSubagentContext clones the parent's state
* by default (cache-sharing forks need identical decisions), or
* resumeAgentBackground threads one reconstructed from sidechain records.
*/
contentReplacementState?: ContentReplacementState
/**
* Parent's rendered system prompt bytes, frozen at turn start.
* Used by fork subagents to share the parent's prompt cache — re-calling
* getSystemPrompt() at fork-spawn time can diverge (GrowthBook cold→warm)
* and bust the cache. See forkSubagent.ts.
*/
renderedSystemPrompt?: SystemPrompt
}
// Re-export ToolProgressData from centralized location
export type { ToolProgressData }
export type Progress = ToolProgressData | HookProgress
export type ToolProgress<P extends ToolProgressData> = {
toolUseID: string
data: P
}
export function filterToolProgressMessages(
progressMessagesForMessage: ProgressMessage[],
): ProgressMessage<ToolProgressData>[] {
return progressMessagesForMessage.filter(
(msg): msg is ProgressMessage<ToolProgressData> =>
msg.data?.type !== 'hook_progress',
)
}
export type ToolResult<T> = {
data: T
newMessages?: (
| UserMessage
| AssistantMessage
| AttachmentMessage
| SystemMessage
)[]
// contextModifier is only honored for tools that aren't concurrency safe.
contextModifier?: (context: ToolUseContext) => ToolUseContext
/** MCP protocol metadata (structuredContent, _meta) to pass through to SDK consumers */
mcpMeta?: {
_meta?: Record<string, unknown>
structuredContent?: Record<string, unknown>
}
}
export type ToolCallProgress<P extends ToolProgressData = ToolProgressData> = (
progress: ToolProgress<P>,
) => void
// Type for any schema that outputs an object with string keys
export type AnyObject = z.ZodType<{ [key: string]: unknown }>
/**
* Checks if a tool matches the given name (primary name or alias).
*/
export function toolMatchesName(
tool: { name: string; aliases?: string[] },
name: string,
): boolean {
return tool.name === name || (tool.aliases?.includes(name) ?? false)
}
/**
* Finds a tool by name or alias from a list of tools.
*/
export function findToolByName(tools: Tools, name: string): Tool | undefined {
return tools.find(t => toolMatchesName(t, name))
}
export type Tool<
Input extends AnyObject = AnyObject,
Output = unknown,
P extends ToolProgressData = ToolProgressData,
> = {
/**
* Optional aliases for backwards compatibility when a tool is renamed.
* The tool can be looked up by any of these names in addition to its primary name.
*/
aliases?: string[]
/**
* One-line capability phrase used by ToolSearch for keyword matching.
* Helps the model find this tool via keyword search when it's deferred.
* 3–10 words, no trailing period.
* Prefer terms not already in the tool name (e.g. 'jupyter' for NotebookEdit).
*/
searchHint?: string
call(
args: z.infer<Input>,
context: ToolUseContext,
canUseTool: CanUseToolFn,
parentMessage: AssistantMessage,
onProgress?: ToolCallProgress<P>,
): Promise<ToolResult<Output>>
description(
input: z.infer<Input>,
options: {
isNonInteractiveSession: boolean
toolPermissionContext: ToolPermissionContext
tools: Tools
},
): Promise<string>
readonly inputSchema: Input
// Type for MCP tools that can specify their input schema directly in JSON Schema format
// rather than converting from Zod schema
readonly inputJSONSchema?: ToolInputJSONSchema
// Optional because TungstenTool doesn't define this. TODO: Make it required.
// When we do that, we can also go through and make this a bit more type-safe.
outputSchema?: z.ZodType<unknown>
inputsEquivalent?(a: z.infer<Input>, b: z.infer<Input>): boolean
isConcurrencySafe(input: z.infer<Input>): boolean
isEnabled(): boolean
isReadOnly(input: z.infer<Input>): boolean
/** Defaults to false. Only set when the tool performs irreversible operations (delete, overwrite, send). */
isDestructive?(input: z.infer<Input>): boolean
/**
* What should happen when the user submits a new message while this tool
* is running.
*
* - `'cancel'` — stop the tool and discard its result
* - `'block'` — keep running; the new message waits
*
* Defaults to `'block'` when not implemented.
*/
interruptBehavior?(): 'cancel' | 'block'
/**
* Returns information about whether this tool use is a search or read operation
* that should be collapsed into a condensed display in the UI. Examples include
* file searching (Grep, Glob), file reading (Read), and bash commands like find,
* grep, wc, etc.
*
* Returns an object indicating whether the operation is a search or read operation:
* - `isSearch: true` for search operations (grep, find, glob patterns)
* - `isRead: true` for read operations (cat, head, tail, file read)
* - `isList: true` for directory-listing operations (ls, tree, du)
* - All can be false if the operation shouldn't be collapsed
*/
isSearchOrReadCommand?(input: z.infer<Input>): {
isSearch: boolean
isRead: boolean
isList?: boolean
}
isOpenWorld?(input: z.infer<Input>): boolean
requiresUserInteraction?(): boolean
isMcp?: boolean
isLsp?: boolean
/**
* When true, this tool is deferred (sent with defer_loading: true) and requires
* ToolSearch to be used before it can be called.
*/
readonly shouldDefer?: boolean
/**
* When true, this tool is never deferred — its full schema appears in the
* initial prompt even when ToolSearch is enabled. For MCP tools, set via
* `_meta['anthropic/alwaysLoad']`. Use for tools the model must see on
* turn 1 without a ToolSearch round-trip.
*/
readonly alwaysLoad?: boolean
/**
* For MCP tools: the server and tool names as received from the MCP server (unnormalized).
* Present on all MCP tools regardless of whether `name` is prefixed (mcp__server__tool)
* or unprefixed (CLAUDE_AGENT_SDK_MCP_NO_PREFIX mode).
*/
mcpInfo?: { serverName: string; toolName: string }
readonly name: string
/**
* Maximum size in characters for tool result before it gets persisted to disk.
* When exceeded, the result is saved to a file and Claude receives a preview
* with the file path instead of the full content.
*
* Set to Infinity for tools whose output must never be persisted (e.g. Read,
* where persisting creates a circular Read→file→Read loop and the tool
* already self-bounds via its own limits).
*/
maxResultSizeChars: number
/**
* When true, enables strict mode for this tool, which causes the API to
* more strictly adhere to tool instructions and parameter schemas.
* Only applied when the tengu_tool_pear is enabled.
*/
readonly strict?: boolean
/**
* Called on copies of tool_use input before observers see it (SDK stream,
* transcript, canUseTool, PreToolUse/PostToolUse hooks). Mutate in place
* to add legacy/derived fields. Must be idempotent. The original API-bound
* input is never mutated (preserves prompt cache). Not re-applied when a
* hook/permission returns a fresh updatedInput — those own their shape.
*/
backfillObservableInput?(input: Record<string, unknown>): void
/**
* Determines if this tool is allowed to run with this input in the current context.
* It informs the model of why the tool use failed, and does not directly display any UI.
* @param input
* @param context
*/
validateInput?(
input: z.infer<Input>,
context: ToolUseContext,
): Promise<ValidationResult>
/**
* Determines if the user is asked for permission. Only called after validateInput() passes.
* General permission logic is in permissions.ts. This method contains tool-specific logic.
* @param input
* @param context
*/
checkPermissions(
input: z.infer<Input>,
context: ToolUseContext,
): Promise<PermissionResult>
// Optional method for tools that operate on a file path
getPath?(input: z.infer<Input>): string
/**
* Prepare a matcher for hook `if` conditions (permission-rule patterns like
* "git *" from "Bash(git *)"). Called once per hook-input pair; any
* expensive parsing happens here. Returns a closure that is called per
* hook pattern. If not implemented, only tool-name-level matching works.
*/
preparePermissionMatcher?(
input: z.infer<Input>,
): Promise<(pattern: string) => boolean>
prompt(options: {
getToolPermissionContext: () => Promise<ToolPermissionContext>
tools: Tools
agents: AgentDefinition[]
allowedAgentTypes?: string[]
}): Promise<string>
userFacingName(input: Partial<z.infer<Input>> | undefined): string
userFacingNameBackgroundColor?(
input: Partial<z.infer<Input>> | undefined,
): keyof Theme | undefined
/**
* Transparent wrappers (e.g. REPL) delegate all rendering to their progress
* handler, which emits native-looking blocks for each inner tool call.
* The wrapper itself shows nothing.
*/
isTransparentWrapper?(): boolean
/**
* Returns a short string summary of this tool use for display in compact views.
* @param input The tool input
* @returns A short string summary, or null to not display
*/
getToolUseSummary?(input: Partial<z.infer<Input>> | undefined): string | null
/**
* Returns a human-readable present-tense activity description for spinner display.
* Example: "Reading src/foo.ts", "Running bun test", "Searching for pattern"
* @param input The tool input
* @returns Activity description string, or null to fall back to tool name
*/
getActivityDescription?(
input: Partial<z.infer<Input>> | undefined,
): string | null
/**
* Returns a compact representation of this tool use for the auto-mode
* security classifier. Examples: `ls -la` for Bash, `/tmp/x: new content`
* for Edit. Return '' to skip this tool in the classifier transcript
* (e.g. tools with no security relevance). May return an object to avoid
* double-encoding when the caller JSON-wraps the value.
*/
toAutoClassifierInput(input: z.infer<Input>): unknown
mapToolResultToToolResultBlockParam(
content: Output,
toolUseID: string,
): ToolResultBlockParam
/**
* Optional. When omitted, the tool result renders nothing (same as returning
* null). Omit for tools whose results are surfaced elsewhere (e.g., TodoWrite
* updates the todo panel, not the transcript).
*/
renderToolResultMessage?(
content: Output,
progressMessagesForMessage: ProgressMessage<P>[],
options: {
style?: 'condensed'
theme: ThemeName
tools: Tools
verbose: boolean
isTranscriptMode?: boolean
isBriefOnly?: boolean
/** Original tool_use input, when available. Useful for compact result
* summaries that reference what was requested (e.g. "Sent to #foo"). */
input?: unknown
},
): React.ReactNode
/**
* Flattened text of what renderToolResultMessage shows IN TRANSCRIPT
* MODE (verbose=true, isTranscriptMode=true). For transcript search
* indexing: the index counts occurrences in this string, the highlight
* overlay scans the actual screen buffer. For count ≡ highlight, this
* must return the text that ends up visible — not the model-facing
* serialization from mapToolResultToToolResultBlockParam (which adds
* system-reminders, persisted-output wrappers).
*
* Chrome can be skipped (under-count is fine). "Found 3 files in 12ms"
* isn't worth indexing. Phantoms are not fine — text that's claimed
* here but doesn't render is a count≠highlight bug.
*
* Optional: omitted → field-name heuristic in transcriptSearch.ts.
* Drift caught by test/utils/transcriptSearch.renderFidelity.test.tsx
* which renders sample outputs and flags text that's indexed-but-not-
* rendered (phantom) or rendered-but-not-indexed (under-count warning).
*/
extractSearchText?(out: Output): string
/**
* Render the tool use message. Note that `input` is partial because we render
* the message as soon as possible, possibly before tool parameters have fully
* streamed in.
*/
renderToolUseMessage(
input: Partial<z.infer<Input>>,
options: { theme: ThemeName; verbose: boolean; commands?: Command[] },
): React.ReactNode
/**
* Returns true when the non-verbose rendering of this output is truncated
* (i.e., clicking to expand would reveal more content). Gates
* click-to-expand in fullscreen — only messages where verbose actually
* shows more get a hover/click affordance. Unset means never truncated.
*/
isResultTruncated?(output: Output): boolean
/**
* Renders an optional tag to display after the tool use message.
* Used for additional metadata like timeout, model, resume ID, etc.
* Returns null to not display anything.
*/
renderToolUseTag?(input: Partial<z.infer<Input>>): React.ReactNode
/**
* Optional. When omitted, no progress UI is shown while the tool runs.
*/
renderToolUseProgressMessage?(
progressMessagesForMessage: ProgressMessage<P>[],
options: {
tools: Tools
verbose: boolean
terminalSize?: { columns: number; rows: number }
inProgressToolCallCount?: number
isTranscriptMode?: boolean
},
): React.ReactNode
renderToolUseQueuedMessage?(): React.ReactNode
/**
* Optional. When omitted, falls back to <FallbackToolUseRejectedMessage />.
* Only define this for tools that need custom rejection UI (e.g., file edits
* that show the rejected diff).
*/
renderToolUseRejectedMessage?(
input: z.infer<Input>,
options: {
columns: number
messages: Message[]
style?: 'condensed'
theme: ThemeName
tools: Tools
verbose: boolean
progressMessagesForMessage: ProgressMessage<P>[]
isTranscriptMode?: boolean
},
): React.ReactNode
/**
* Optional. When omitted, falls back to <FallbackToolUseErrorMessage />.
* Only define this for tools that need custom error UI (e.g., search tools
* that show "File not found" instead of the raw error).
*/
renderToolUseErrorMessage?(
result: ToolResultBlockParam['content'],
options: {
progressMessagesForMessage: ProgressMessage<P>[]
tools: Tools
verbose: boolean
isTranscriptMode?: boolean
},
): React.ReactNode
/**
* Renders multiple parallel instances of this tool as a group.
* @returns React node to render, or null to fall back to individual rendering
*/
/**
* Renders multiple tool uses as a group (non-verbose mode only).
* In verbose mode, individual tool uses render at their original positions.
* @returns React node to render, or null to fall back to individual rendering
*/
renderGroupedToolUse?(
toolUses: Array<{
param: ToolUseBlockParam
isResolved: boolean
isError: boolean
isInProgress: boolean
progressMessages: ProgressMessage<P>[]
result?: {
param: ToolResultBlockParam
output: unknown
}
}>,
options: {
shouldAnimate: boolean
tools: Tools
},
): React.ReactNode | null
}
/**
* A collection of tools. Use this type instead of `Tool[]` to make it easier
* to track where tool sets are assembled, passed, and filtered across the codebase.
*/
export type Tools = readonly Tool[]
/**
* Methods that `buildTool` supplies a default for. A `ToolDef` may omit these;
* the resulting `Tool` always has them.
*/
type DefaultableToolKeys =
| 'isEnabled'
| 'isConcurrencySafe'
| 'isReadOnly'
| 'isDestructive'
| 'checkPermissions'
| 'toAutoClassifierInput'
| 'userFacingName'
/**
* Tool definition accepted by `buildTool`. Same shape as `Tool` but with the
* defaultable methods optional — `buildTool` fills them in so callers always
* see a complete `Tool`.
*/
export type ToolDef<
Input extends AnyObject = AnyObject,
Output = unknown,
P extends ToolProgressData = ToolProgressData,
> = Omit<Tool<Input, Output, P>, DefaultableToolKeys> &
Partial<Pick<Tool<Input, Output, P>, DefaultableToolKeys>>
/**
* Type-level spread mirroring `{ ...TOOL_DEFAULTS, ...def }`. For each
* defaultable key: if D provides it (required), D's type wins; if D omits
* it or has it optional (inherited from Partial<> in the constraint), the
* default fills in. All other keys come from D verbatim — preserving arity,
* optional presence, and literal types exactly as `satisfies Tool` did.
*/
type BuiltTool<D> = Omit<D, DefaultableToolKeys> & {
[K in DefaultableToolKeys]-?: K extends keyof D
? undefined extends D[K]
? ToolDefaults[K]
: D[K]
: ToolDefaults[K]
}
/**
* Build a complete `Tool` from a partial definition, filling in safe defaults
* for the commonly-stubbed methods. All tool exports should go through this so
* that defaults live in one place and callers never need `?.() ?? default`.
*
* Defaults (fail-closed where it matters):
* - `isEnabled` → `true`
* - `isConcurrencySafe` → `false` (assume not safe)
* - `isReadOnly` → `false` (assume writes)
* - `isDestructive` → `false`
* - `checkPermissions` → `{ behavior: 'allow', updatedInput }` (defer to general permission system)
* - `toAutoClassifierInput` → `''` (skip classifier — security-relevant tools must override)
* - `userFacingName` → `name`
*/
const TOOL_DEFAULTS = {
isEnabled: () => true,
isConcurrencySafe: (_input?: unknown) => false,
isReadOnly: (_input?: unknown) => false,
isDestructive: (_input?: unknown) => false,
checkPermissions: (
input: { [key: string]: unknown },
_ctx?: ToolUseContext,
): Promise<PermissionResult> =>
Promise.resolve({ behavior: 'allow', updatedInput: input }),
toAutoClassifierInput: (_input?: unknown) => '',
userFacingName: (_input?: unknown) => '',
}
// The defaults type is the ACTUAL shape of TOOL_DEFAULTS (optional params so
// both 0-arg and full-arg call sites type-check — stubs varied in arity and
// tests relied on that), not the interface's strict signatures.
type ToolDefaults = typeof TOOL_DEFAULTS
// D infers the concrete object-literal type from the call site. The
// constraint provides contextual typing for method parameters; `any` in
// constraint position is structural and never leaks into the return type.
// BuiltTool<D> mirrors runtime `{...TOOL_DEFAULTS, ...def}` at the type level.
// eslint-disable-next-line @typescript-eslint/no-explicit-any
type AnyToolDef = ToolDef<any, any, any>
export function buildTool<D extends AnyToolDef>(def: D): BuiltTool<D> {
// The runtime spread is straightforward; the `as` bridges the gap between
// the structural-any constraint and the precise BuiltTool<D> return. The
// type semantics are proven by the 0-error typecheck across all 60+ tools.
return {
...TOOL_DEFAULTS,
userFacingName: () => def.name,
...def,
} as BuiltTool<D>
}
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