release: 9.12.1 (#663)

* fix(client): send content-type header for requests with an omitted optional body

* release: 9.12.1

---------

Co-authored-by: stainless-app[bot] <142633134+stainless-app[bot]@users.noreply.github.com>

Author: stainless-app[bot]

.release-please-manifest.json

@@ -1,3 +1,3 @@
 {
-  ".": "9.12.0"
+  ".": "9.12.1"
 }

CHANGELOG.md

@@ -1,5 +1,13 @@
 # Changelog
 
+## 9.12.1 (2026-06-16)
+
+Full Changelog: [v9.12.0...v9.12.1](https://github.com/Finch-API/finch-api-node/compare/v9.12.0...v9.12.1)
+
+### Bug Fixes
+
+* **client:** send content-type header for requests with an omitted optional body ([94c0b7f](https://github.com/Finch-API/finch-api-node/commit/94c0b7f440454ae4eff4a12dae821142f9c6e728))
+
 ## 9.12.0 (2026-06-09)
 
 Full Changelog: [v9.11.2...v9.12.0](https://github.com/Finch-API/finch-api-node/compare/v9.11.2...v9.12.0)

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@tryfinch/finch-api",
-  "version": "9.12.0",
+  "version": "9.12.1",
   "description": "The official TypeScript library for the Finch API",
   "author": "Finch <founders@tryfinch.com>",
   "types": "dist/index.d.ts",

packages/mcp-server/manifest.json

@@ -1,7 +1,7 @@
 {
   "dxt_version": "0.2",
   "name": "@tryfinch/finch-api-mcp",
-  "version": "9.12.0",
+  "version": "9.12.1",
   "description": "The official MCP Server for the Finch API",
   "author": {
     "name": "Finch",

packages/mcp-server/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@tryfinch/finch-api-mcp",
-  "version": "9.12.0",
+  "version": "9.12.1",
   "description": "The official MCP Server for the Finch API",
   "author": "Finch <founders@tryfinch.com>",
   "types": "dist/index.d.ts",

packages/mcp-server/src/server.ts

@@ -29,7 +29,7 @@ export const newMcpServer = async ({
   new McpServer(
     {
       name: 'tryfinch_finch_api_api',
-      version: '9.12.0',
+      version: '9.12.1',
     },
     {
       instructions: await getInstructions({ stainlessApiKey, customInstructionsPath }),

src/client.ts

@@ -816,11 +816,19 @@ export class Finch {
     return () => controller.abort();
   }
 
-  private buildBody({ options: { body, headers: rawHeaders } }: { options: FinalRequestOptions }): {
+  private buildBody({ options }: { options: FinalRequestOptions }): {
     bodyHeaders: HeadersLike;
     body: BodyInit | undefined;
   } {
+    const { body, headers: rawHeaders } = options;
     if (!body) {
+      // A resource method always passes a `body` key when its operation defines a
+      // request body, even if the caller omitted an optional body param. Keep the
+      // content-type for those, and only elide it for operations with no body at
+      // all (e.g. GET/DELETE).
+      if (body == null && 'body' in options) {
+        return this.#encoder({ body, headers: buildHeaders([rawHeaders]) });
+      }
       return { bodyHeaders: undefined, body: undefined };
     }
     const headers = buildHeaders([rawHeaders]);

src/version.ts

@@ -1 +1 @@
-export const VERSION = '9.12.0'; // x-release-please-version
+export const VERSION = '9.12.1'; // x-release-please-version