blackwell-systems/agent-lsp

v0.12.0 Bugfix

This release fixes issues for SREs watching stability and regressions.

Published 2h AI Agents & Assistants

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✓ No known CVEs patched in this version

Topics

agentskills ai-agents ai-tooling claude claude-code code-intelligence

+13 more

code-quality coding-agent developer-tools go language-server-protocol lsp mcp mcp-server model-context-protocol python rust static-analysis typescript

Summary

AI summary

Fixed Windows daemon mode for Python/TypeScript language servers by resolving 12 platform‑specific bugs.

Changes in this release

Type	Severity	Summary	CVE
Feature
Feature	Low	Adds configurable broker timeout via `AGENT_LSP_BROKER_TIMEOUT_MS` (default 30 s). Adds configurable broker timeout via `AGENT_LSP_BROKER_TIMEOUT_MS` (default 30 s). Source: llm_adapter@2026-06-04 Confidence: high	—
Feature	Low	Adds spawn‑diagnostics logging to `~/.cache/agent-lsp/spawn-logs/<language>.log`. Adds spawn‑diagnostics logging to `~/.cache/agent-lsp/spawn-logs/<language>.log`. Source: llm_adapter@2026-06-04 Confidence: high	—
Feature	Low	Adds 785 new unit tests across five core packages, raising coverage significantly. Adds 785 new unit tests across five core packages, raising coverage significantly. Source: llm_adapter@2026-06-04 Confidence: low	—
Bugfix	Medium	Fixes 12 Windows‑specific bugs causing daemon mode failures. Fixes 12 Windows‑specific bugs causing daemon mode failures. Source: llm_adapter@2026-06-04 Confidence: low	—

Full changelog

v0.12.0

Windows daemon mode fixed

Daemon mode (Python/TypeScript language servers) is now fully functional on Windows. This release fixes 12 platform-specific bugs that caused start_lsp to fail with "broker did not start within 10 seconds" on every Windows session.

Fixes include:

Process detachment using CREATE_NEW_PROCESS_GROUP + CREATE_NO_WINDOW
PID liveness checks via OpenProcess + GetExitCodeProcess (replacing rejected Signal(0))
Daemon registry race condition: daemon.json now written after socket bind
URI handling: RFC 8089 canonical form file:///X:/path
Case-insensitive path comparison for NTFS in cross-repo reference partitioning
StopDaemon using TerminateProcess (replacing rejected SIGTERM)
Configurable broker timeout via AGENT_LSP_BROKER_TIMEOUT_MS (default 30s)
Spawn diagnostics captured to ~/.cache/agent-lsp/spawn-logs/<language>.log

Thank you to @TheodorKleynhans for this comprehensive contribution. 🙏

Test coverage

785 new unit tests across 5 core packages:

| Package | Before | After | Change |
|---------|--------|-------|--------|
| internal/config | 70.0% | 96.2% | +26.2pp |
| internal/resources | 39.3% | 73.2% | +33.9pp |
| internal/session | 64.6% | 76.9% | +12.3pp |
| internal/lsp | 39.2% | 50.1% | +10.9pp |
| internal/tools | 39.3% | 40.7% | +1.4pp |

README positioning

Restructured the README to clarify that agent-lsp is an MCP server that orchestrates existing LSP servers (gopls, rust-analyzer, jdtls, etc.), not an LSP server itself. Added "What is it?" and "Why agent-lsp?" sections.

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About blackwell-systems/agent-lsp

Stateful MCP server over real language servers. 50 tools, 30 CI-verified languages, 20 agent workflows. Persistent sessions keep the index warm across files and projects. Speculative execution simulates edits in memory before writing to disk.

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Related context

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Earlier breaking changes

v0.11.0 `get_change_impact` renamed to `blast_radius`. Same handler, same parameters, new name.