docs: blog for code mode MCP by alexhancock · Pull Request #6126 · block/goose

alexhancock · 2025-12-15T21:47:22Z

A blog for #6030

Will need to wait for a release, but should be in v1.17.0 I think

Copilot

Pull request overview

This PR adds a blog post announcing the implementation of Code Mode MCP in goose v1.17.0, following similar approaches described by Cloudflare and Anthropic. The post explains how goose uses JavaScript code generation and the Boa engine to enable models to discover and chain tool calls more efficiently.

Adds a new author entry for Alex Hancock to the blog authors file
Creates a blog post explaining Code Mode MCP implementation in goose
Includes metadata for social media sharing

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 4 comments.

File	Description
documentation/blog/authors.yml	Adds author profile for alexhancock with social links
documentation/blog/2025-12-15-code-mode-mcp/index.md	New blog post documenting Code Mode MCP implementation in goose

documentation/blog/2025-12-15-code-mode-mcp/index.md

github-actions · 2025-12-15T21:50:34Z

PR Preview Action v1.6.0
Preview removed because the pull request was closed.
2025-12-18 02:46 UTC

Copilot

Pull request overview

Copilot reviewed 2 out of 3 changed files in this pull request and generated 1 comment.

documentation/blog/2025-12-15-code-mode-mcp/index.md

Copilot

Pull request overview

Copilot reviewed 2 out of 3 changed files in this pull request and generated no new comments.

blackgirlbytes · 2025-12-15T21:59:06Z

documentation/blog/2025-12-15-code-mode-mcp/index.md

+
+## In goose
+
+In v1.17.0 of goose, we've introduced an open source implementation of this idea in a new platform extension called: Code Execution.


this is not out yet..so we should make it clear to people that it's coming up.

Because the blog is going to merge and go live immediately..and people will say where is code mode, but we're all on 1.16.1

yeah agreed! going to wait for release

blackgirlbytes · 2025-12-15T22:06:25Z

documentation/blog/2025-12-15-code-mode-mcp/header-image.jpg

ADD THE WORDS CODE MODE ON HERE..BIG LETTERS ..or share the canva file with me so i can edit. this is one we want people to click a ton 🔥 thank you for writing this!!!

Copilot

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Copilot reviewed 2 out of 3 changed files in this pull request and generated no new comments.

michaelneale · 2025-12-15T22:32:17Z

documentation/blog/2025-12-15-code-mode-mcp/index.md

+
+* The model can progressively discover relevant tools, without all server and tool definitions in the context window from the beginning
+* The model can chain tool call results into inputs to further tool calls without the intermediate results needing to flow back to the model, costing tokens and exposing data which is potentially sensitive to the model unnecessarily
+* The models pre-training datasets have made them very efficient at analyzing large programmatic APIs and deciding how to usefully call them, as compared to having been trained only on contrived examples of MCP tool calling


Suggested change

* The models pre-training datasets have made them very efficient at analyzing large programmatic APIs and deciding how to usefully call them, as compared to having been trained only on contrived examples of MCP tool calling

* The models pre-training datasets have made them very efficient at analyzing large programmatic APIs and deciding how to usefully call them, as compared to having been trained only on contrived examples of MCP tool calling

* This could allow 100s of MCPs to be made available to the agent, with 1000s of tools, without consuming the context window, as they are only progressively loaded when needed or discovered

* MCP Extensions can be enabled by default, vs needing to remember to turn them on and off

documentation/blog/2025-12-15-code-mode-mcp/index.md

Copilot

Pull request overview

Copilot reviewed 2 out of 3 changed files in this pull request and generated 1 comment.

Copilot · 2025-12-16T23:08:06Z

documentation/blog/2025-12-15-code-mode-mcp/index.md

+<head>
+  <meta property="og:title" content="Code Mode MCP in goose" />
+  <meta property="og:type" content="article" />
+  <meta property="og:url" content="https://block.github.io/goose/blog/2025/12/15/code-mode-mcp-in-goose" />


The URL path in the og:url meta tag references "2025/12/15" which is inconsistent with the future date issue. This should match the actual publication date of the blog post.

Suggested change

<meta property="og:url" content="https://block.github.io/goose/blog/2025/12/15/code-mode-mcp-in-goose" />

<meta property="og:url" content="https://block.github.io/goose/blog/2024/12/15/code-mode-mcp-in-goose" />

Copilot

Pull request overview

Copilot reviewed 2 out of 3 changed files in this pull request and generated 4 comments.

Copilot · 2025-12-18T02:00:11Z

documentation/blog/2025-12-15-code-mode-mcp/index.md

+
+In v1.17.0 of goose, we've introduced an open source implementation of this idea in a new platform extension called: Code Execution.
+Our implementation generates a JavaScript interface representing the connected MCP tools and then lets the model write code to run
+against it in [boa](https://github.com/boa-dev/boa) which is an embeddable Javascript engine. One neat feature of boa we were able


Inconsistent capitalization of "JavaScript". The term should be consistently capitalized as "JavaScript" (capital S) throughout the document, but line 38 uses "Javascript".

Suggested change

against it in [boa](https://github.com/boa-dev/boa) which is an embeddable Javascript engine. One neat feature of boa we were able

against it in [boa](https://github.com/boa-dev/boa) which is an embeddable JavaScript engine. One neat feature of boa we were able

Copilot · 2025-12-18T02:00:11Z

documentation/blog/2025-12-15-code-mode-mcp/index.md

+
+* The model can progressively discover relevant tools, without all server and tool definitions in the context window from the beginning
+* The model can chain tool call results into inputs to further tool calls without the intermediate results needing to flow back to the model - this saves on tokens and avoids exposing potentially sensitive data to the model unnecessarily
+* The models pre-training datasets have made them very efficient at analyzing large programmatic APIs and writing code to call them, as compared to having been trained only on contrived examples of MCP tool calling


Missing possessive apostrophe. "models pre-training datasets" should be "models' pre-training datasets" (or "model's pre-training datasets" if referring to a singular model).

Suggested change

* The models pre-training datasets have made them very efficient at analyzing large programmatic APIs and writing code to call them, as compared to having been trained only on contrived examples of MCP tool calling

* The models' pre-training datasets have made them very efficient at analyzing large programmatic APIs and writing code to call them, as compared to having been trained only on contrived examples of MCP tool calling

Copilot · 2025-12-18T02:00:11Z

documentation/blog/2025-12-15-code-mode-mcp/index.md

+<head>
+  <meta property="og:title" content="Code Mode MCP in goose" />
+  <meta property="og:type" content="article" />
+  <meta property="og:url" content="https://block.github.io/goose/blog/2025/12/15/code-mode-mcp-in-goose" />


The og:url metadata uses "code-mode-mcp-in-goose" but the folder is named "code-mode-mcp". Based on other blog posts, the URL slug should match the folder name. The URL should be "https://block.github.io/goose/blog/2025/12/15/code-mode-mcp" instead of "code-mode-mcp-in-goose".

Suggested change

<meta property="og:url" content="https://block.github.io/goose/blog/2025/12/15/code-mode-mcp-in-goose" />

<meta property="og:url" content="https://block.github.io/goose/blog/2025/12/15/code-mode-mcp" />

documentation/blog/2025-12-15-code-mode-mcp/index.md

Copilot

Pull request overview

Copilot reviewed 2 out of 3 changed files in this pull request and generated no new comments.

* 'main' of github.com:block/goose: (28 commits) Clean PR preview sites from gh-pages branch history (#6161) fix: make goose reviewer less sycophantic (#6171) revert /reply to previous behavior (replacing session history) when full conversation provided (#6058) chore: manually update version (#6166) Integrate pricing with canonical model (#6130) Regenerate canonical models when release branch is created. (#6127) fix: use correct parameter name in read_module handler (#6148) docs: blog for code mode MCP (#6126) test: add ACP integration test (#6150) docs: auto download updates (#6163) fix: respect default_enabled value of platform extensions (#6159) docs: skills (#6062) fix: add conditional configuration for GOOSE_BIN_DIR in PATH (#5940) Update dependencies to help in Fedora packaging (#5835) fix: make goose reviewer less bad (#6154) docs: create/edit recipe button (#6145) fix(google): Fix 400 Bad Request error with Gemini 3 thought signatures (#6035) fix: we don't need to warn about tool count when in code mode (#6149) deps: upgrade agent-client-protocol to 0.9.0 (#6109) fix(providers): fix for gemini-cli on windows to work around cmd's multiline prompt limitations #5911 (#5966) ... # Conflicts: # ui/desktop/src/api/sdk.gen.ts # ui/desktop/src/hooks/useAgent.ts

alexhancock requested review from DOsinga, Copilot and michaelneale December 15, 2025 21:47

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docs: blog for code mode MCP

03802e1

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alexhancock merged commit f3d2f1d into main Dec 18, 2025
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alexhancock deleted the alexhancock/code-mode-mcp-blog branch December 18, 2025 02:43

github-actions bot mentioned this pull request Dec 19, 2025

chore(release): release version 1.18.0 (minor) #6194

Merged


		## In goose

		In v1.17.0 of goose, we've introduced an open source implementation of this idea in a new platform extension called: Code Execution.

	<meta property="og:url" content="https://block.github.io/goose/blog/2025/12/15/code-mode-mcp-in-goose" />
	<meta property="og:url" content="https://block.github.io/goose/blog/2024/12/15/code-mode-mcp-in-goose" />

	against it in [boa](https://github.com/boa-dev/boa) which is an embeddable Javascript engine. One neat feature of boa we were able
	against it in [boa](https://github.com/boa-dev/boa) which is an embeddable JavaScript engine. One neat feature of boa we were able

	* The models pre-training datasets have made them very efficient at analyzing large programmatic APIs and writing code to call them, as compared to having been trained only on contrived examples of MCP tool calling
	* The models' pre-training datasets have made them very efficient at analyzing large programmatic APIs and writing code to call them, as compared to having been trained only on contrived examples of MCP tool calling

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alexhancock commented Dec 15, 2025 •

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