v1.15.0

What's Changed

Features

• feat(tool): add build failure summary by @mcncl in #330

Fixes

• chore(http): correctly return 4XX responses by @mcncl in #331

Chores

• chore(deps): update dependency go to v1.26.5 by @renovate[bot] in #334
• fix(deps): update go-minor-patch by @renovate[bot] in #335
• chore(deps): update all non-major dependencies by @renovate[bot] in #336
• chore(deps): update buildkite-pipelines by @renovate[bot] in #337
• chore(deps): upgrade mcp sdk for upcoming mcp protocol 2026-07-29 update by @wolfeidau in #333

New Contributors

• @renovate[bot] made their first contribution in #334

Tool Changes

New tool: get_build_failure_summary

• Diagnoses a Buildkite build failure in one call, replacing the usual sequence of build, job, log, annotation, and Test Engine queries.
• Returns build state, terminal problem and downstream failed or broken jobs, promised failures from still-running jobs, bounded log tails, error and warning annotations, and failed Test Engine executions.
• Defaults to bounded diagnostic output. Use log_tail, max_jobs, max_annotations, max_test_runs, max_failed_tests, and max_failed_tests_per_run to tune it, or disable optional sections with include_logs, include_annotations, and include_failed_tests.
• Adds the investigations toolset for cross-domain build-failure diagnosis. It is included when using the default all toolsets configuration and requires the read_builds, read_build_logs, and read_suites scopes.

MCP Protocol Support

• Upgrades the official Go SDK to v1.7.0-pre.3, adding support for the upcoming MCP 2026-07-28 protocol revision.
• Streamable HTTP can now use the new stateless protocol with per-request metadata, server/discover, and standardized routing and version headers, while preserving compatibility with 2025-11-25 and earlier clients through version negotiation.
• The new protocol revision contains breaking changes for implementers. See The 2026-07-28 MCP Specification Release Candidate for details.

Full Changelog: v1.14.1...v1.15.0