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fix: normalize null tool input from Anthropic adapter #266

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fix: normalize null tool input from Anthropic adapter #266

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2be24b4
fix: normalize null tool input from Anthropic adapter
dbowes-fm Feb 6, 2026
1e275bb
Merge branch 'main' into fix/null-tool-input-normalization
AlemTuzlak Feb 6, 2026
f0c28a9
ci: apply automated fixes
autofix-ci[bot] Feb 6, 2026
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6 changes: 4 additions & 2 deletions packages/typescript/ai-anthropic/src/adapters/text.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -398,9 +398,10 @@ export class AnthropicTextAdapter<
for (const toolCall of message.toolCalls) {
let parsedInput: unknown = {}
try {
parsedInput = toolCall.function.arguments
const parsed = toolCall.function.arguments
? JSON.parse(toolCall.function.arguments)
: {}
parsedInput = parsed && typeof parsed === 'object' ? parsed : {}
} catch {
parsedInput = toolCall.function.arguments
}
Expand Down Expand Up @@ -586,7 +587,8 @@ export class AnthropicTextAdapter<
// Emit TOOL_CALL_END
let parsedInput: unknown = {}
try {
parsedInput = existing.input ? JSON.parse(existing.input) : {}
const parsed = existing.input ? JSON.parse(existing.input) : {}
parsedInput = parsed && typeof parsed === 'object' ? parsed : {}
} catch {
parsedInput = {}
}
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10 changes: 7 additions & 3 deletions packages/typescript/ai/src/activities/chat/tools/tool-calls.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -127,10 +127,11 @@ export class ToolCallManager {
let toolResultContent: string
if (tool?.execute) {
try {
// Parse arguments
// Parse arguments (normalize "null" to "{}" for empty tool_use blocks)
let args: unknown
try {
args = JSON.parse(toolCall.function.arguments)
const argsString = toolCall.function.arguments.trim() || '{}'
args = JSON.parse(argsString === 'null' ? '{}' : argsString)
} catch (parseError) {
throw new Error(
`Failed to parse tool arguments as JSON: ${toolCall.function.arguments}`,
Expand Down Expand Up @@ -294,7 +295,10 @@ export async function executeToolCalls(

// Parse arguments, throwing error if invalid JSON
let input: unknown = {}
const argsStr = toolCall.function.arguments.trim() || '{}'
let argsStr = toolCall.function.arguments.trim() || '{}'
// Normalize "null" to "{}" — can occur when the model streams a tool_use
// block with no input_json_delta events (Anthropic adapter edge case)
if (argsStr === 'null') argsStr = '{}'
if (argsStr) {
try {
input = JSON.parse(argsStr)
Expand Down
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