acm-context-management 0.2.1

Context-management gateway + MCP server that brings the ACM techniques (trimming, summarisation, image-recall, memory) into any IDE

ACM Extension — context management for any IDE

This folder is self-contained. It turns the context-management engine that already powers the website (in ../backend) into something usable from VSCode, Cursor, Antigravity, Claude Code, and Windsurf — without changing a single line of the website's code.

It reaches the IDEs through three surfaces (see ../EXTENSION_PLAN.md for the why):

Folder	Surface	What it is
acm_gateway/	Gateway	A local OpenAI/Anthropic-compatible proxy. The IDE talks to it as if it were the AI; it applies every technique on the wire, then forwards to the real provider. Full feature parity.
acm_mcp/	MCP	An MCP server exposing remember / recall / compact / set_profile tools. Works in every MCP-capable IDE.
adapters/	Hooks + config	Per-IDE glue: Claude Code hooks, Cursor mcp.json, VSCode notes.
acm_engine/	—	Thin bridge that imports the techniques from ../backend so there is one source of truth.

How it reuses the website's engine

acm_engine/ puts ../backend on sys.path and re-exports the pure technique functions (trim_tool_results, summarise_old_messages, sliding_window_trim, evict_stale_images, annotate_cache_breakpoints) plus the Profile schema. Nothing in ../backend is edited. The website and the extension share the same code; fix a bug once, both benefit.

Quick start (gateway)

cd extension
uv venv --python 3.11
source .venv/bin/activate
uv pip install -e .

# point it at any OpenAI-compatible upstream (OpenRouter shown)
export ACM_UPSTREAM_BASE_URL=https://openrouter.ai/api/v1
export ACM_UPSTREAM_API_KEY=sk-or-v1-...

acm-gateway            # serves http://127.0.0.1:8807

Then tell the IDE the AI lives at http://127.0.0.1:8807/v1 (Cursor: custom OpenAI base URL; Claude Code: ANTHROPIC_BASE_URL).

Config

A single config/acm.config.example.json holds the active profile (which techniques are on). Copy it to config/acm.config.json and edit, or set ACM_CONFIG to its path. The schema is the website's Profile model — same presets (minimal, long_chat, power_research, cheap_long, visual_recall).

Status

• Gateway — runnable. OpenAI (/v1/chat/completions) and Anthropic (/v1/messages) surfaces; full technique pipeline (trim / summarise / sliding window / image-evict / cache breakpoints / visual method — rasterise big tool outputs to images); manual message removal (cascade-safe drop-list, persisted to ~/.acm/dropped.json); multi-provider routing (OpenAI / OpenRouter / Google / Azure on the OpenAI surface, Anthropic native; creds in ~/.acm/providers.json; route by x-acm-provider header, slug/model prefix, or default — Bedrock via OpenRouter since it needs AWS SigV4); control plane (/status, /profile, /memory, /compact, /conversations, /messages*, /providers*).
• MCP server — runnable: memory (remember/recall), compact, set_profile/status, manual removal (list_messages/drop_message/ restore_message), providers (list_providers/add_provider/ set_default_provider), sub-agent (spawn_subagent), and JIT retrieval (find_files/read_slice/grep_files).
• Claude Code — gateway + hooks (trim + memory) + MCP. Done.
• Cursor — gateway + hooks (capture + compact-on-stop) + MCP. Done.
• VSCode — full extension (Language Model Tools + @acm chat participant + webview settings) talking to the gateway; MCP drop-in for Antigravity / Windsurf. TypeScript is written but not yet tsc-compiled here (needs npm install with @types/vscode).

Remaining work is marked with # TODO(acm) / TODO(acm): orphan-tool_use pruning on the Anthropic path, React components in the VSCode webview, and auto-starting the gateway from the extension.