diff --git a/src/core/error.ts b/src/core/error.ts
index 89ffec90..eea91395 100644
--- a/src/core/error.ts
+++ b/src/core/error.ts
@@ -4,6 +4,8 @@ import { castToError } from '../internal/errors';
 
 export class AnthropicError extends Error {}
 
+export class UnableToParseToolParameterError extends AnthropicError {}
+
 export class APIError<
   TStatus extends number | undefined = number | undefined,
   THeaders extends Headers | undefined = Headers | undefined,
diff --git a/src/lib/BetaMessageStream.ts b/src/lib/BetaMessageStream.ts
index 934da564..e791d64b 100644
--- a/src/lib/BetaMessageStream.ts
+++ b/src/lib/BetaMessageStream.ts
@@ -1,6 +1,6 @@
 import { partialParse } from '../_vendor/partial-json-parser/parser';
 import type { Logger } from '../client';
-import { AnthropicError, APIUserAbortError } from '../error';
+import { AnthropicError, APIUserAbortError, UnableToParseToolParameterError } from '../error';
 import { isAbortError } from '../internal/errors';
 import { type RequestOptions } from '../internal/request-options';
 import {
@@ -413,6 +413,9 @@ export class BetaMessageStream<ParsedT = null> implements AsyncIterable<BetaMess
       // NOTE: _emit('error', error) should only be called from #handleError().
 
       const error = args[0] as AnthropicError;
+      if (this.#params?.ignore_tool_parameter_parse_errors && error instanceof UnableToParseToolParameterError) {
+        return;
+      }
       if (!this.#catchingPromiseCreated && !listeners?.length) {
         // Trigger an unhandled rejection if the user hasn't registered any error handlers.
         // If you are seeing stack traces here, make sure to handle errors via either:
@@ -635,7 +638,7 @@ export class BetaMessageStream<ParsedT = null> implements AsyncIterable<BetaMess
                 try {
                   newContent.input = partialParse(jsonBuf);
                 } catch (err) {
-                  const error = new AnthropicError(
+                  const error = new UnableToParseToolParameterError(
                     `Unable to parse tool parameter JSON from model. Please retry your request or adjust your prompt. Error: ${err}. JSON: ${jsonBuf}`,
                   );
                   this.#handleError(error);
diff --git a/src/resources/beta/messages/messages.ts b/src/resources/beta/messages/messages.ts
index 8f9e26f0..e1c99725 100644
--- a/src/resources/beta/messages/messages.ts
+++ b/src/resources/beta/messages/messages.ts
@@ -3192,6 +3192,16 @@ export interface MessageCreateParamsBase {
    * Header param: Optional header to specify the beta version(s) you want to use.
    */
   betas?: Array<BetaAPI.AnthropicBeta>;
+
+
+  /**
+   * Body param: Whether to ignore tool parameter parse errors.
+   *
+   * If set to `true`, the model will ignore tool parameter parse errors and return them in the response.
+   *
+   * If set to `false`, the model will return an error if a tool parameter parse error occurs.
+   */
+  ignore_tool_parameter_parse_errors?: boolean;
 }
 
 export namespace MessageCreateParams {