Source: https://internal-agents.com/agents/block-builderbot # Block — Builderbot A multi-agent orchestration layer built on goose + MCP that coordinates agents across Block's entire codebase, invoked in Slack to take a ticket end-to-end to a reviewed PR. - Approach type: Orchestration system - Deployment stage: Scaled - Autonomy: Drafts reviewed - Evidence strength: Detailed primary - Status: Internal - First reported year: 2026 - Work: Coding, Code review - Interfaces: Slack, Linear, Jira, Github - Invocation: Event driven, Interactive - Entry reviewed: 2026-09-09 ## Where people stay involved - **ticket → reviewed pull request** — Work product review · Level 3 ## Overview ### Summary A multi-agent orchestration layer built on goose + MCP that coordinates agents across Block's entire codebase, invoked in Slack to take a ticket end-to-end to a reviewed PR. Fact · Reported · High confidence · `block-builderbot--summary` Confidence reason: A linked first-party source states the claim. Evidence: - Supports · [1] [Block rolls out Builderbot, a new suite of AI-native tools that changes the way we ship](https://block.xyz/inside/block-rolls-out-builderbot-a-new-suite-of-ai-native-tools-that-changes-the-way-we-ship) · [Preserved copy](https://github.com/steel-experiments/internal-agents-map/blob/main/archive/sources/block-builderbot-source-1/content.md) - Supports · [2] [Protecting our systems with intelligence (Builderbot architecture)](https://engineering.block.xyz/blog/protecting-our-systems-with-intelligence) · [Preserved copy](https://github.com/steel-experiments/internal-agents-map/blob/main/archive/sources/block-builderbot-source-2/content.md) - Contextualizes · [3] [block/builderbot source repository](https://github.com/block/builderbot) · [Preserved copy](https://github.com/steel-experiments/internal-agents-map/blob/main/archive/sources/block-builderbot-source-3/content.md) - Contextualizes · [4] [Hacker News discussion of the Builderbot announcement](https://news.ycombinator.com/item?id=48618973) · [Preserved copy](https://github.com/steel-experiments/internal-agents-map/blob/main/archive/sources/block-builderbot-source-4/content.md) ## How it works ### Supporting component Coordinates multiple agents over one codebase instead of running a single loop Fact · Reported · High confidence · `block-builderbot--primitives-0` Confidence reason: A linked first-party source states the claim. Evidence: - Supports · [1] [Block rolls out Builderbot, a new suite of AI-native tools that changes the way we ship](https://block.xyz/inside/block-rolls-out-builderbot-a-new-suite-of-ai-native-tools-that-changes-the-way-we-ship) · [Preserved copy](https://github.com/steel-experiments/internal-agents-map/blob/main/archive/sources/block-builderbot-source-1/content.md) ### Supporting component Linear/Jira ticket -> branch -> code -> PR -> CI watch, end to end Fact · Reported · High confidence · `block-builderbot--primitives-1` Confidence reason: A linked first-party source states the claim. Evidence: - Supports · [1] [Block rolls out Builderbot, a new suite of AI-native tools that changes the way we ship](https://block.xyz/inside/block-rolls-out-builderbot-a-new-suite-of-ai-native-tools-that-changes-the-way-we-ship) · [Preserved copy](https://github.com/steel-experiments/internal-agents-map/blob/main/archive/sources/block-builderbot-source-1/content.md) ## Supervision evidence ### Operating model assessment Level 3 for ticket → reviewed pull request; human attention boundary: work-product-review. Inference · Catalog judgment · High confidence · `block-builderbot--operating-models-0` Confidence reason: The source explicitly describes end-to-end implementation ending in a reviewed pull request. Qualifications: - Observation date: 2026-06-21 Evidence: - Supports · [1] [Block rolls out Builderbot, a new suite of AI-native tools that changes the way we ship](https://block.xyz/inside/block-rolls-out-builderbot-a-new-suite-of-ai-native-tools-that-changes-the-way-we-ship) · [Preserved copy](https://github.com/steel-experiments/internal-agents-map/blob/main/archive/sources/block-builderbot-source-1/content.md) ## Implementation details ### Sandbox unknown Inference · Catalog judgment · Medium confidence · `block-builderbot--architecture-sandbox` Confidence reason: The preserved sources do not document an execution sandbox; unknown does not mean absent. Evidence: - Supports · [1] [Block rolls out Builderbot, a new suite of AI-native tools that changes the way we ship](https://block.xyz/inside/block-rolls-out-builderbot-a-new-suite-of-ai-native-tools-that-changes-the-way-we-ship) · [Preserved copy](https://github.com/steel-experiments/internal-agents-map/blob/main/archive/sources/block-builderbot-source-1/content.md) ### Harness Multi-agent orchestration built on goose (open-source agent framework) + MCP; multi-player, real-time, operating inside Slack threads Fact · Reported · High confidence · `block-builderbot--architecture-harness` Confidence reason: A linked first-party source states the claim. Evidence: - Supports · [1] [Block rolls out Builderbot, a new suite of AI-native tools that changes the way we ship](https://block.xyz/inside/block-rolls-out-builderbot-a-new-suite-of-ai-native-tools-that-changes-the-way-we-ship) · [Preserved copy](https://github.com/steel-experiments/internal-agents-map/blob/main/archive/sources/block-builderbot-source-1/content.md) ### Model goose framework; model not specified Fact · Reported · High confidence · `block-builderbot--architecture-model` Confidence reason: A linked first-party source states the claim. Evidence: - Supports · [1] [Block rolls out Builderbot, a new suite of AI-native tools that changes the way we ship](https://block.xyz/inside/block-rolls-out-builderbot-a-new-suite-of-ai-native-tools-that-changes-the-way-we-ship) · [Preserved copy](https://github.com/steel-experiments/internal-agents-map/blob/main/archive/sources/block-builderbot-source-1/content.md) ### Interfaces slack, linear, jira, github Fact · Reported · High confidence · `block-builderbot--architecture-interfaces` Confidence reason: A linked first-party source states the claim. Evidence: - Supports · [1] [Block rolls out Builderbot, a new suite of AI-native tools that changes the way we ship](https://block.xyz/inside/block-rolls-out-builderbot-a-new-suite-of-ai-native-tools-that-changes-the-way-we-ship) · [Preserved copy](https://github.com/steel-experiments/internal-agents-map/blob/main/archive/sources/block-builderbot-source-1/content.md) ### Tool access MCP connects agents to internal tools and data; picks up Linear/Jira tickets, creates the branch, writes code, opens the PR, watches CI Fact · Reported · High confidence · `block-builderbot--architecture-tool-access` Confidence reason: A linked first-party source states the claim. Evidence: - Supports · [1] [Block rolls out Builderbot, a new suite of AI-native tools that changes the way we ship](https://block.xyz/inside/block-rolls-out-builderbot-a-new-suite-of-ai-native-tools-that-changes-the-way-we-ship) · [Preserved copy](https://github.com/steel-experiments/internal-agents-map/blob/main/archive/sources/block-builderbot-source-1/content.md) ### Knowledge Company-wide code context across hundreds of millions of lines and hundreds of services; Block also frames Builderbot as an 'agentic protector' around its software world model Fact · Reported · High confidence · `block-builderbot--architecture-knowledge` Confidence reason: A linked first-party source states the claim. Evidence: - Supports · [1] [Block rolls out Builderbot, a new suite of AI-native tools that changes the way we ship](https://block.xyz/inside/block-rolls-out-builderbot-a-new-suite-of-ai-native-tools-that-changes-the-way-we-ship) · [Preserved copy](https://github.com/steel-experiments/internal-agents-map/blob/main/archive/sources/block-builderbot-source-1/content.md) - Supports · [2] [Protecting our systems with intelligence (Builderbot architecture)](https://engineering.block.xyz/blog/protecting-our-systems-with-intelligence) · [Preserved copy](https://github.com/steel-experiments/internal-agents-map/blob/main/archive/sources/block-builderbot-source-2/content.md) ## Reported metrics ### Headline claim ~1,500 PRs merged per week (~15% of all production code changes at Block) Metric · Reported · High confidence · `block-builderbot--headline-metric` Confidence reason: A linked first-party source states the claim. Qualifications: - Reported by: Block - Scope: Builderbot merged pull requests per week at Block - Denominator: All production code changes across Block for the approximately 15% share Evidence: - Supports · [1] [Block rolls out Builderbot, a new suite of AI-native tools that changes the way we ship](https://block.xyz/inside/block-rolls-out-builderbot-a-new-suite-of-ai-native-tools-that-changes-the-way-we-ship) · [Preserved copy](https://github.com/steel-experiments/internal-agents-map/blob/main/archive/sources/block-builderbot-source-1/content.md) · Preserved content.md, lines 24 ### Key observation 200,000+ operations per day Metric · Reported · High confidence · `block-builderbot--key-metrics-0` Confidence reason: A linked first-party source states the claim. Qualifications: - The source does not report the denominator of this figure. - Reported by: Block - Scope: Builderbot operations per day; the article does not define an operation Evidence: - Supports · [1] [Block rolls out Builderbot, a new suite of AI-native tools that changes the way we ship](https://block.xyz/inside/block-rolls-out-builderbot-a-new-suite-of-ai-native-tools-that-changes-the-way-we-ship) · [Preserved copy](https://github.com/steel-experiments/internal-agents-map/blob/main/archive/sources/block-builderbot-source-1/content.md) · Preserved content.md, lines 24 ### Key observation ~1,500 pull requests merged per week (~15% of all production code changes at Block) Metric · Reported · High confidence · `block-builderbot--key-metrics-1` Confidence reason: A linked first-party source states the claim. Qualifications: - Reported by: Block - Scope: Builderbot merged pull requests per week at Block - Denominator: All production code changes across Block for the approximately 15% share Evidence: - Supports · [1] [Block rolls out Builderbot, a new suite of AI-native tools that changes the way we ship](https://block.xyz/inside/block-rolls-out-builderbot-a-new-suite-of-ai-native-tools-that-changes-the-way-we-ship) · [Preserved copy](https://github.com/steel-experiments/internal-agents-map/blob/main/archive/sources/block-builderbot-source-1/content.md) · Preserved content.md, lines 24 ## Reported outcomes and statements ### Key observation "What used to take months now takes days" Opinion · Reported · Low confidence · `block-builderbot--key-metrics-2` Confidence reason: Qualitative company statement, not a measured before-and-after study. Qualifications: - Scope: Reported turnaround for Square seller features and repetitive engineering work Evidence: - Supports · [1] [Block rolls out Builderbot, a new suite of AI-native tools that changes the way we ship](https://block.xyz/inside/block-rolls-out-builderbot-a-new-suite-of-ai-native-tools-that-changes-the-way-we-ship) · [Preserved copy](https://github.com/steel-experiments/internal-agents-map/blob/main/archive/sources/block-builderbot-source-1/content.md) · Preserved content.md, lines 24–26 ## Lessons and interpretation ### Lesson Concentrate investment on orchestration, context, and the environment; let engineers focus on the problems worth solving Inference · Catalog judgment · Medium confidence · `block-builderbot--lessons-learned-0` Confidence reason: The catalog derives this observation from the linked sources. Evidence: - Supports · [1] [Block rolls out Builderbot, a new suite of AI-native tools that changes the way we ship](https://block.xyz/inside/block-rolls-out-builderbot-a-new-suite-of-ai-native-tools-that-changes-the-way-we-ship) · [Preserved copy](https://github.com/steel-experiments/internal-agents-map/blob/main/archive/sources/block-builderbot-source-1/content.md) ### Lesson Meet people in Slack: tag @builderbot with a short description and it works in the thread Inference · Catalog judgment · Medium confidence · `block-builderbot--lessons-learned-1` Confidence reason: The catalog derives this observation from the linked sources. Evidence: - Supports · [1] [Block rolls out Builderbot, a new suite of AI-native tools that changes the way we ship](https://block.xyz/inside/block-rolls-out-builderbot-a-new-suite-of-ai-native-tools-that-changes-the-way-we-ship) · [Preserved copy](https://github.com/steel-experiments/internal-agents-map/blob/main/archive/sources/block-builderbot-source-1/content.md) ### Lesson Multi-player real-time collaboration lets humans steer research, planning, and implementation rather than only reviewing after the fact Inference · Catalog judgment · Medium confidence · `block-builderbot--lessons-learned-2` Confidence reason: The catalog derives this observation from the linked sources. Evidence: - Supports · [1] [Block rolls out Builderbot, a new suite of AI-native tools that changes the way we ship](https://block.xyz/inside/block-rolls-out-builderbot-a-new-suite-of-ai-native-tools-that-changes-the-way-we-ship) · [Preserved copy](https://github.com/steel-experiments/internal-agents-map/blob/main/archive/sources/block-builderbot-source-1/content.md) ## Sources 1. [Block rolls out Builderbot, a new suite of AI-native tools that changes the way we ship](https://block.xyz/inside/block-rolls-out-builderbot-a-new-suite-of-ai-native-tools-that-changes-the-way-we-ship) - Engineering blog · First party · Evidence - Original URL: - Accessed: 2026-08-12 · Last verified: 2026-08-31 - Preserved copy in the repository: 2. [Protecting our systems with intelligence (Builderbot architecture)](https://engineering.block.xyz/blog/protecting-our-systems-with-intelligence) - Engineering blog · First party · Evidence - Original URL: - Accessed: 2026-08-12 · Last verified: 2026-08-31 - Preserved copy in the repository: 3. [block/builderbot source repository](https://github.com/block/builderbot) - Repository · First party · Evidence - Original URL: - Accessed: 2026-08-12 · Last verified: 2026-08-31 - Preserved copy in the repository: 4. [Hacker News discussion of the Builderbot announcement](https://news.ycombinator.com/item?id=48618973) - Hn thread · Community · Commentary - Original URL: - Published: 2026-06-21 · Accessed: 2026-08-12 · Last verified: 2026-08-31 - Preserved copy in the repository: 5. [Hacker News comment that points to the Builderbot repository](https://news.ycombinator.com/item?id=48619052) - Hn comment · Community · Discovery - Original URL: - Published: 2026-06-21 · Accessed: 2026-08-12 · Last verified: 2026-08-31 - Preserved copy in the repository: