Warmplane

Security controls:

The local control plane that keeps Model Context Protocol (MCP) sessions warm with compact capability facades, policy governance, and deterministic execution.

v0.28.0 — Changelog · User Guide · Agent Skill · Performance · Whitepaper · OpenAPI

⚡ What is Warmplane?

Warmplane is a local control plane and reverse proxy for AI tool calling. It maintains persistent, warm connections to multiple upstream MCP servers and multiplexes them behind a single, governed interface.

The Problems Warmplane Solves

1. Context Window Token Bloat: Sending massive JSON schemas for dozens of tools on every turn wastes tens of thousands of prompt tokens. Warmplane provides a compact catalog index (cutting payload size by 58–96%), on-demand schema discovery, and SHA-256 ETag caching.

2. Poor Tool Descriptions & Ambiguity: Many upstream tools have sparse, misleading, or poorly phrased docstrings that confuse LLMs. Warmplane lets you override tool summaries and descriptions via polymorphic aliases (AliasTarget) and generates compact parameter signatures (tool(req, [opt])) to optimize zero-shot agent accuracy without upstream code edits.

3. Duplicate Invocations & Retries: When network hiccups occur, naive agents retry blind mutations. Warmplane provides crash-resilient, exactly-once idempotency deduplication (idk_<sha256>) and explicit retry classifications (safe, idempotent, unsafe).

4. Ungoverned Execution & Security: Connecting agents directly to live infrastructure risks unauthorized operations. Warmplane enforces multi-tenant RBAC, per-profile server constellations, secret redaction, and Human-in-the-Loop (HITL) approval gates.

5. Cascading Hangs & Flakiness: Slow or crashed upstream processes freeze agent loops. Warmplane monitors health with sub-microsecond circuit breakers and self-healing process supervision.

Related MCP server: MCP Server Proxy

🚀 Quick Start

1. Installation

Homebrew (macOS & Linux):

brew tap warmplane/tap
brew install warmplane

Cargo (crates.io):

cargo install warmplane

# Optional: with local ONNX vector search (FastEmbed)
cargo install warmplane --features semantic-search

Build from Source:

git clone https://github.com/Warmplane/warmplane.git
cd warmplane
cargo install --path . --features semantic-search

2. Configure Upstream Servers

Add servers interactively or import from existing AI tools:

# Interactive setup wizard
warmplane server add

# Or non-interactively
warmplane server add filesystem --command npx --arg "-y" --arg "@modelcontextprotocol/server-filesystem" --arg "/tmp"
warmplane server add context7 --url "https://mcp.context7.ai/sse" --bearer-env "CONTEXT7_API_KEY"

# Or 1-click import from Claude Desktop, Cursor, OpenCode, Zed
warmplane config import

Or configure mcp_servers.json:

{
  "port": 9090,
  "toolTimeoutMs": 15000,
  "capabilityAliases": {
    "db.query": "sqlite.read_query",
    "search": {
      "target": "semble-rs.search",
      "summary": "Search codebase using semantic or BM25 ranking. Pass absolute repo path."
    }
  },
  "policy": {
    "allow": ["db.*", "fs.*", "search"],
    "deny": ["fs.delete*"],
    "requireApproval": ["db.mutation*"],
    "redactKeys": ["token", "password", "api_key"]
  },
  "profiles": {
    "coding": {
      "servers": ["filesystem", "sqlite"],
      "description": "Local engineering and exploration tools"
    }
  },
  "mcpServers": {
    "sqlite": { "command": "npx", "args": ["-y", "@modelcontextprotocol/server-sqlite", "./test.db"] },
    "filesystem": { "command": "npx", "args": ["-y", "@modelcontextprotocol/server-filesystem", "/tmp"] }
  }
}

3. Start Warmplane

# Start background daemon & Web Control Deck on http://127.0.0.1:9090
warmplane daemon

# Or expose Warmplane as a stdio MCP server for Claude Desktop or Cursor
warmplane mcp-server

🔌 Client Interfaces

Warmplane exposes three primary access models sharing the same unified core state, policy gates, and telemetry:

1. Native MCP Stdio Proxy (warmplane mcp-server)

Point any MCP-native desktop client (Claude Desktop, Cursor, Zed, Windsurf) directly to Warmplane:

{
  "mcpServers": {
    "warmplane": {
      "command": "warmplane",
      "args": ["mcp-server", "--config", "mcp_servers.json", "--profile", "coding"]
    }
  }
}

2. HTTP REST Control Plane (warmplane daemon)

Full-featured HTTP JSON API for gateways, web apps, and backend services:

• GET /v1/capabilities: Compact capability catalog index

• POST /v1/capabilities/search: Hybrid lexical + semantic capability search

• POST /v1/tools/call: Normalized execution envelope with context distillation (_jsonpath, _limit_lines) and idempotency keys

• POST /v1/tools/batch_call: Chained multi-step execution with $step.field parameter interpolation

• GET /v1/tasks & POST /v1/tasks/:id/update: SEP-2663 async task lifecycle & HITL review

• GET /ui: Embedded standalone Web Control Deck

3. In-Process Embedded Engine (EmbeddedWarmplane)

Direct in-process Rust library for zero-overhead agent execution without HTTP child processes or network hops:

use warmplane::{EmbeddedWarmplane, engine::ExecutionOptions};
use serde_json::json;

#[tokio::main]
async fn main() -> anyhow::Result<()> {
    let (cp, _token) = EmbeddedWarmplane::start_from_path("mcp_servers.json").await?;
    let res = cp.call_capability(
        "filesystem.read_file",
        json!({ "path": "/tmp/test.txt" }),
        ExecutionOptions::default().with_request_id("req-1"),
    ).await;
    println!("Output: {:?}", res.data);
    Ok(())
}

🤖 Teach Your AI Agent Warmplane (Agent Skill)

Warmplane includes an official Agent Skill (.skills/warmplane/) adhering to the agentskills.io open standard. Point your coding agent (Claude Code, Google Antigravity, Cursor, OpenCode, Codex) directly to this repository:

# Install Warmplane Skill into Claude Code
claude skill install Warmplane/warmplane

# Or copy into your agent workspace
mkdir -p .agents/skills/warmplane && cp -r .skills/warmplane/* .agents/skills/warmplane/

• 📖 .skills/warmplane/SKILL.md — Core prompt triggers and standard agent workflows

• 🔌 references/mcp_stdio_usage.md — 1-Click client configs (17 IDEs) & MCP facade tools

• ⚙️ references/configuration_schema.md — mcp_servers.json schema & dynamic secrets

• 🛠️ references/cli_cheatsheet.md — Terminal commands for daemon, sync, and vault

• 🚑 references/error_resolution.md — Circuit breakers, policy denials, and recovery

📊 Performance Highlights

Warmplane is engineered in pure Rust with zero-cost abstractions:

• 50.4 ns: ETag Cache Validation (If-None-Match $\rightarrow$ 304 Not Modified)

• 159.8 ns: Idempotent Cache-Hit Deduplication

• 1.58 µs: SHA-256 Incremental Catalog Version Hashing ($N=10$)

• 15.9 µs: Filtered Hybrid Capability Search ($N=50$)

• 372.1 µs: Zero-Allocation Lexical Tag Search across 1,000 Tools

👉 See complete benchmarks and methodology in docs/PERFORMANCE.md.

🛡️ Core Capabilities Matrix

Changelog

v0.28.0 — Real-Time MCP list_changed Notifications, SEP-1319 Discovery Hints & Passthrough Tools

• Real-Time MCP list_changed Notifications (src/mcp_server.rs, src/daemon/state.rs): Advertised listChanged: true across tools, resources, and prompts capabilities (enable_tool_list_changed, enable_resources_list_changed, enable_resources_subscribe, enable_prompts_list_changed). Active MCP stdio sessions receive real-time JSON-RPC notifications whenever upstream servers mount/unmount or config/aliases mutate.

• SEP-1319 Metadata Discovery Hints (src/mcp_server.rs): Injected io.warmplane/discovery_hint metadata payload into notifications/tools/list_changed advising agents to run capabilities_list to discover backend capabilities without incurring constant token costs on tool schemas.

• Top-Level Native Tool Passthrough (src/config.rs, src/mcp_server.rs, src/cli_config.rs): Promoted capability aliases (passthrough: true) into native top-level tools exported directly in tools/list with strict MCP name sanitization (^[a-zA-Z0-9_-]{1,64}$) and direct dispatch resolution.

• WORM Audit Trail on Dynamic Mutations (src/daemon/lifecycle.rs, src/http_v1/config_api.rs): Added tamper-evident SHA-256 hash-chained AuditEventType::ConfigMutation audit records across server mounts/unmounts, alias mutations, security policy updates, and profile configuration changes.

• Interactive Alias Management UI (ui/src/components/aliases.ts, ui/src/main.ts): Added click-to-edit alias rows, passthrough toggle pill badges, and input sanitization directly in the Control Deck web UI.

v0.27.0 — Custom Alias Descriptions, Compact LLM Tool Signatures & Task Inspector

• Custom Alias Descriptions & Docstring Overrides (src/config.rs, src/supervisor.rs): Upgraded alias configuration model to support polymorphic definitions (AliasTarget). Aliases can be simple target strings ("alias": "server.tool") or detailed objects ("alias": { "target": "server.tool", "summary": "...", "description": "..." }), enabling platform engineers and developers to repair or improve poorly-described upstream tools for zero-shot LLM ergonomics without upstream source changes.

• Compact LLM Tool Signatures (src/supervisor.rs, src/daemon/types.rs, src/engine/types.rs): Derived deterministic, compact parameter signatures (tool_name(req1, [opt1], [opt2])) from JSON Schemas (accounting for required fields vs nullable/optional properties). Surfaced across MCP capabilities_list, catalog search, and Web UI index summaries.

• Bidirectional Alias Resolution (src/supervisor.rs): Resolved mapping mismatch where supervisory discovery checks target equality against configured alias keys, ensuring canonical targets are promoted seamlessly to client interfaces.

• Rich Task Inspector Modal & Dual Controls (ui/src/components/tasks.ts): Enhanced Tasks & Approvals UI with dedicated inspector modal, live state viewers, formatted JSON payload inspections, and dual inspect/cancel action controls.

• Server Template Missing Secret Warnings (ui/src/components/servers.ts, src/vault/): Added live (Missing Keys) warning badges and status indicators across server cards and diagnostics when required template environment variables or Keychain secrets are unconfigured.

• Live Alias Configuration API & UI: Added custom summary inputs to the Control Deck Aliases tab (ui/src/components/aliases.ts) and CLI (warmplane config alias set --summary ...) with automated live hot-reloading reconciliation on disk mutation.

v0.26.1 — MCP Stdio Stream Isolation & Logging Fix

• MCP Stdio Stream Isolation (src/telemetry.rs): Configured tracing_subscriber::fmt::layer() to write to stderr (.with_writer(std::io::stderr)). Prevents runtime structured JSON logs and span diagnostics from polluting stdout.

• Upstream Process Stderr Inheritance (src/supervisor.rs): Upstream stdio child processes now explicitly inherit Warmplane's standard error (cmd.stderr(std::process::Stdio::inherit())). Prevents upstream startup banners (e.g. Memory and Filesystem server banners) from leaking into stdio JSON-RPC sessions.

• Client Protocol Reliability: Resolves JSON-RPC initialization failure (invalid message version tag ""; expected "2.0") when running Warmplane in stdio server mode (warmplane mcp-server) with AI agents and IDEs.

v0.26.0 — 1-Click AI Client Sync, Native Secrets Vault, ChatOps & Profile Governance

• 1-Click AI Client Injector & Ecosystem Sync (src/client_sync.rs): Zero-configuration bidirectional MCP adapter engine. Detects, injects, and detaches Warmplane proxy configurations with profile binding across Claude Desktop (macOS, Linux, Windows), OpenCode, Claude Code CLI (CLAUDE_CONFIG_DIR), Cursor (Global & Workspace), Zed Editor (context_servers), Windsurf, and Roo Code / Cline.

• 100% Agent Config Import Parity (src/config_import.rs): Unified external config discovery with dialect-aware parsers (StandardMcpServers, OpenCode mcp, Zed context_servers) and self-proxy protection.

• Native OS Keychain Vault & Dynamic Secrets (src/vault/): Added secure OS-level credential management (warmplane secret set/get/delete) and dynamic runtime secret expansion (keychain://, op://, env://) in environment variables with masked logs.

• Actionable ChatOps & Bidirectional Webhooks (src/chatops/): Rich interactive approval cards for Slack (Block Kit), Discord (Embeds), and Microsoft Teams (Adaptive Cards) with HMAC-SHA256 signature verification.

• Per-Profile Governance Policies (src/policy.rs, ui/src/components/policy.ts): Fine-grained per-profile allow, deny, and requireApproval rules overriding or scoping global policies.

• Constellation Boundaries & Dynamic Visibility (ui/src/components/servers.ts): Visual constellation badges (✔ IN CONSTELLATION, 🚫 EXCLUDED FROM PROFILE), auto-derived <server>.* implicit policy denials, and 1-click membership toggles.

• Server Diagnostics & 1-Click Restart: Added live error diagnostics modals, server restart endpoint (POST /v1/config/servers/:id/restart), and automated smoke testing suite for all 25 MCP server templates (scripts/test-templates.ts).

• Dynamic Catalog ETag Fingerprinting & Layout Stabilization: Profile-aware fingerprint hashing (sha256:...-p:<profile_id>:<hash>) ensuring immediate ETag invalidation and playground catalog re-population. Stabilized viewport layouts with continuous scrollbar gutter reservation.

v0.25.2 — Official MCP Registry Metadata & MCPB Packaging Format

• MCPB Distribution Format (packaging/mcpb/, .github/workflows/release-artifacts.yml): Added automated build and packaging of platform-specific Model Context Protocol Bundles (.mcpb) containing standalone binaries, bootstrap configurations, and standardized manifests (manifest_version: "0.3").

• Official MCP Registry Metadata (server.json): Release workflows now automatically generate canonical registry metadata adhering to the official server.schema.json specification (io.github.warmplane/warmplane) with multi-arch SHA-256 package digests.

• Homebrew Tap (Warmplane/homebrew-tap): Configured official tap distribution with prebuilt macOS and Linux formula (brew tap warmplane/tap && brew install warmplane).

v0.25.1 — Asynchronous Task Completion State Machine Fix

• Asynchronous Task Finalization (src/engine/mod.rs, src/http_v1/execute.rs): Resolved regression where asynchronous capability executions (async_task: true or Prefer: respond-async) and tasks resumed after Human-in-the-Loop (HITL) input responses remained indefinitely in TaskStatus::Working. Background workers now reliably record terminal state (TaskStatus::Completed with result, or TaskStatus::Failed with structured error) directly into TaskRegistry.

• Embedded Task Lifecycle Tests (tests/embedded_tests.rs, tests/tasks_tests.rs): Added comprehensive automated integration tests verifying that get_task and list_tasks observe terminal completed status with upstream payload following approval submissions and direct asynchronous calls.

v0.25.0 — Control Deck Tasks & HITL UI, In-Process Embedded Task API

• Control Deck Tasks & Approvals Hub (ui/src/components/tasks.ts): Upgraded the review queue into a unified Tasks & Approvals dashboard (data-tab="tasks") with live status KPIs (input_required, working, completed, cancelled/failed), interactive action cards with inlined MRTR input resolution forms (booleans, JSON editors, text fields), TTL countdown timers, and cooperative cancellation controls.

• MCP Playground Async Execution Mode: Added "⚡ Async Task Mode" toggle in the tool testing playground and an interactive 202 Accepted task card preview with 1-click navigation to the Tasks & Approvals review deck.

• Embedded Rust Task Management API (ControlPlaneHandle): Exposed direct task management methods on the in-process ControlPlaneHandle (list_tasks, get_task, update_task, cancel_task), allowing embedding applications to manage asynchronous SEP-2663 tasks without HTTP or JSON-RPC serialization overhead.

• Overview Cockpit & Badge Integration: Added "Tasks & HITL State" telemetry card in the Overview Cockpit and linked real-time sidebar badges to outstanding input_required tasks.

v0.24.0 — SEP-2663 Tasks Extension, Unified HITL Execution & MCP Roadmap Alignment

• SEP-2663 Tasks Extension Implementation (src/tasks.rs): Implemented the official io.modelcontextprotocol/tasks capability with atomic persistent storage (tasks.json), safe TTL expiration detection, and oneshot input response channels (TaskWaitSender / TaskWaitReceiver).

• Unified HITL Approval & Asynchronous Task State Machine: Unified Human-in-the-Loop approval workflows and asynchronous tool executions directly onto the SEP-2663 lifecycle. Tool executions requiring operator gate approval or requested with async_task: true / Prefer: respond-async return 202 Accepted with resultType: "task" and status: "input_required", inlining MRTR inputRequests.

• HTTP REST Task API (/v1/tasks/*): Added comprehensive REST endpoints for task inspection and control: GET /v1/tasks (list), GET /v1/tasks/:id (poll status/result), POST /v1/tasks/:id/update (submit inputResponses to wake up worker), and POST /v1/tasks/:id/cancel (cooperative cancellation).

• MCP Facade Server Integration: Exposed task_get, task_update, and task_cancel tools on the MCP facade server for direct agent orchestration.

• CLI Tasks Subcommands & Async Execution Flag: Added warmplane tasks list, warmplane tasks get <id>, warmplane tasks update <id> -r '<json>', warmplane tasks cancel <id>, and the --async-task flag to warmplane call-capability.

• MCP Protocol Roadmap Strategic Analysis: Published docs/MCP_ROADMAP_REPORT.md analyzing the official MCP roadmap and Warmplane's architectural alignment across stateless transports, sessionless routing, and progressive capability discovery.

v0.23.0 — Embedded Rust Engine, In-Process Control Plane & Facade Adapter Refactoring

• In-Process Embedded Rust Library Engine (EmbeddedWarmplane, ControlPlaneHandle): Exposed Warmplane as a pure in-process library without HTTP, daemon child process, or JSON-RPC serialization overhead. Callers spawn the engine directly on their own Tokio runtime via EmbeddedWarmplane::start(config) or EmbeddedWarmplane::start_from_path(path) and interact via typed ControlPlaneHandle methods (list_capabilities, describe_capability, search_capabilities, call_capability, batch_call, read_resource, get_prompt, health_status).

• Strongly Typed Generic Envelopes & Error Models: Added Envelope<T>, WarmplaneError, CapabilitySummary, CapabilityDetail, ExecutionOptions, ReadResourceOptions, GetPromptOptions, and EngineHealthStatus in warmplane::engine::types, preserving structured diagnostics (request_id, trace_id, retry, operator) for programmatic orchestration.

• MCP Stdio Server Facade Adapter Refactoring: Refactored mcp_server.rs to delegate all tool call execution, search, descriptions, batch execution, and resource/prompt dispatch directly to ControlPlaneHandle, eliminating duplicated logic and unifying execution pipelines.

• Embedded Engine Integration Test Suite: Added dedicated integration tests in tests/embedded_tests.rs covering embedded lifecycle startup, degraded server handling, health status inspection, and graceful cancellation.

v0.22.0 — Streamable HTTP/SSE MCP Transport, Interactive Playground & UI Polish

• Streamable HTTP/SSE MCP Server Transport (mcp-http-server): Built standalone and daemon-co-hosted HTTP/SSE MCP server endpoints (/mcp/sse, /mcp/messages), allowing remote AI agents and IDEs (Cursor, Windsurf, Claude Desktop) to connect over standard HTTP/SSE networks with automatic keep-alives and zero client drift.

• Daemon Co-hosting & Configuration (mcpHttpServer): Added first-class configuration support (mcpHttpServer) enabling automatic background initialization of HTTP/SSE MCP server instances directly alongside the core /v1 HTTP daemon.

• Profile Restriction & Bound Auth Gate: Integrated profile restriction (profile) on the MCP server transport, strictly isolating tools and resources exposed to remote clients. Automatically enforced bearer token authentication when binding to public non-loopback network interfaces (0.0.0.0 / external IPs).

• Interactive MCP Playground Ergonomics: Added sample template injection, dynamic format switching, schema-driven argument generation, and live parameter validation in the Web Control Deck MCP Playground.

• UI Transitions, Collision Checks & Polish: Deduplicated page headers across dashboard tabs, introduced buttery-smooth CSS cubic-bezier transitions, animated modal backdrops with prefers-reduced-motion accessibility support, and added collision guards with automatic unique server ID derivation.

v0.21.0 — Named Server Constellations (Profiles), Signal Lifecycle & Integrator Ecosystem

• Named Server Constellations (Profiles): Added first-class profile support (ProfileConfig) allowing task-relevant subsets of upstream MCP servers to be grouped into named constellations (e.g. coding, research, data_science).

• Dynamic Profile Selection & Scoped ETag Partitioning: Supported per-request profile scoping via X-Warmplane-Profile headers and ?profile= query parameters. Catalog endpoints (/v1/capabilities, /v1/resources, /v1/prompts) and search (/v1/capabilities/search) dynamically prune items outside the active profile and maintain deterministic profile-partitioned ETags (sha256:...-p:<profile_id>).

• MCP Facade Stdio Profile Filtering: Added --profile <name> CLI option to warmplane mcp-server and warmplane list-capabilities, providing agent hosts with a strictly scoped MCP tool and resource surface.

• Web Control Deck Profile Hub: Added interactive visual profile manager in the Web UI dashboard with 1-click active constellation switching, server toggles, and live catalog filtering.

• Signal Handling & Process Teardown Hardening: Integrated immediate tokio_util::sync::CancellationToken dispatch on SIGINT (Ctrl-C) / SIGTERM, unblocked SSE stream draining, added child process orphan prevention via kill_on_drop(true), and enforced a 3-second bounded safety shutdown timeout.

• Developer & Integrator Ecosystem Guides: Published official Rust Integrators Guide, TypeScript Integrators Guide, and Idempotency Architecture Editorial.

v0.20.0 — Multi-Tenant RBAC & Deterministic Catalog Partitioning

• Multi-Tenant RBAC Engine (src/rbac): Built role-based access control engine with support for static API tokens, token-to-role mappings in configuration (rbac.tokens), and cryptographic HMAC-SHA256 symmetric JWT signature verification with configurable secret key (rbac.jwt_secret).

• Deterministic Catalog Partitioning & Scope Pruning: Restructured /v1/capabilities, /v1/resources, /v1/prompts, and /v1/capabilities/search to dynamically filter items by caller role and effective policy. Unauthorized items are completely invisible in catalog listings and search queries.

• Tenant Context Injection & Non-Repudiation Audit: Injected resolved TenantContext (tenant_id, role, actor_id, grant_id, effective_policy) into request extensions via RBAC guard middleware (src/rbac/middleware.rs). Bound verified tenant/actor metadata automatically into WORM audit events.

• Role Policy Overrides & HITL Delegation: Supported fine-grained role definitions (RolePolicyConfig) with custom allow, deny, require_approval, and redact_keys rules, overriding or intersecting with base system policy.

• Integration Test Suite: Added dedicated RBAC integration tests (tests/rbac_integration.rs) covering token authentication, search filtering, catalog isolation, policy boundary enforcement, and multi-tenant audit verification.

v0.19.0 — Client-Delegated MCP Sampling, HTTP/SSE Supervisor Loop & Hardening

• Client-Delegated MCP Sampling (sampling/createMessage): Implemented client-delegated LLM completion reverse RPC handling (src/sampling.rs). Upstream servers or agents submit sampling requests, generating tracked tickets (samp_<timestamp>_<seq>) with synchronous long-polling or asynchronous lifecycle endpoints (POST /v1/sampling/create_message, GET /v1/sampling/requests, GET /v1/sampling/requests/:id, POST /v1/sampling/requests/:id/respond).

• Persistent Sampling State: Added atomic, restart-resilient disk storage (sampling.json) via AtomicFile<HashMap<String, PendingSamplingRequest>> with automated expiration reaper tasks.

• Self-Healing Streamable HTTP/SSE Supervisor: Integrated remote HTTP/SSE MCP servers into the supervisor loop with automated reconnection backoff, catalog reconciliation, and degraded boot status reporting.

• Security & DoS Hardening: Capped candidate capability embeddings for semantic vector search to MAX_VECTOR_SEARCH_CANDIDATES = 250; bounded audit export queries to MAX_IN_MEMORY_AUDIT_EVENTS (20,000); enforced Host header and loopback Origin checks on OAuth proxy requests.

• CI Gating & TypeScript Typechecking: Added automated TypeScript typechecking (tsc --noEmit) to Web UI CI pipeline and restricted push triggers to main to eliminate duplicate runs.

• Pragmatic Rust Compliance: Achieved 100% adherence across all 51 source files with standard compliance headers (// Rust guideline compliant YYYY-MM-DD).

v0.18.0 — Persistent State Subsystem, Graceful Teardown, CI UI Automation & E2E Test Suite

• Persistent State Subsystem: Added atomic, restart-resilient disk storage (AtomicFile<T> and StateDirectory) for Human-in-the-Loop pending approvals (approvals.json), idempotent execution records (idempotency.json), OAuth2 tokens (oauth_tokens.json), and catalog mutation events (catalog_events.json). Added state block in McpConfig and warmplane config state show/set CLI commands.

• Graceful Signal Handling & Subsystem Teardown: Added robust SIGINT (Ctrl+C) and SIGTERM signal capture on Unix and Windows, integrated graceful HTTP server draining, async audit worker flushes (AuditWorkerMsg::FlushAndShutdown), and clean stdio subprocess process termination on shutdown.

• Pragmatic Rust Compliance: Achieved 100% adherence across all 51 source files with standard compliance headers (// Rust guideline compliant YYYY-MM-DD).

• CI Automated Web UI Build & Drift Gate: Integrated Bun into GitHub Actions CI (ci.yml) and release pipelines (release-artifacts.yml), with automated build steps and strict git diff --exit-code ui/dist/index.html drift detection.

• Comprehensive End-to-End Integration Suite: Implemented dedicated E2E test harness (tests/e2e_tests.rs) exercising stdio MCP protocol handshakes, live TCP SSE streaming, config hot-reloading, mock OAuth2 RFC 8414 provider round-trips with silent 401 token refresh, and supervisor recovery.

v0.17.0 — 360° MCP Explorer, Visual Batch Pipeline Builder & WORM Audit Pagination

• WORM Audit Multi-Field Search & Pagination: Added case-insensitive substring search across 11 metadata fields, outcome status and server filters, offset/limit pagination slicing (/v1/audit/events), and context-aware CSV and JSONL export downloads (/v1/audit/export).

• MCP Resources Explorer & Live Content Reader: Added 360° resource discovery browser with protocol scheme badges (file://, postgres://, github://, memory://, sqlite://, etc.), metadata/MIME viewer, and live content reader supporting context distillation (_jsonpath, _limit_lines, _truncate_bytes).

• MCP Prompt Template Studio: Added dynamic prompt template browsing and argument form generation with REQUIRED validation badges, rendering resolved system/user prompt envelopes (/v1/prompts/get).

• In-Flight Operation Cancellation: Added interactive UI execution cancellation controls with live execution timers and instant cooperative abort (POST /v1/operations/:id/cancel).

• Visual Multi-Step Batch Pipeline Builder: Added interactive modal pipeline editor for chaining tools with parameter variable interpolation (${steps[0].result.id}) and per-node fault tolerance (POST /v1/tools/batch_call).

• Realtime SSE State Synchronization: Connected /v1/resources/updates SSE stream to automatically refresh resources, prompts, and catalog feeds on the Control Deck.

v0.16.0 — Enterprise Security Hardening, Audit Cryptographic Integrity & Lifecycle Resilience

• API Token Authentication & Middleware Guarding: Added --auth-token CLI parameter, McpConfig.auth_token configuration field, and WARMPLANE_AUTH_TOKEN environment variable support to securely protect daemon endpoints with Bearer/X-Warmplane-Key authentication.

• OAuth Proxy Security & Secret Masking: Hardened the OAuth proxy listener with Host validation and cross-origin browser blocking; masked state and PKCE code_challenge secrets in log output.

• Cryptographic WORM Audit Integrity & HMAC Signing: Included all 20 persisted metadata fields in hash chain digests (work_item_id, client_ip, resource_uri, execution_latency_us, error_message); added HMAC-SHA256 keyed digest calculations and checkpoint generation for external cryptographic anchoring.

• Secret Sanitization & Redaction: Enhanced case-insensitive redaction matching with built-in default sensitive key list (token, secret, password, key, authorization, etc.); restricted external HITL webhook events to only transmit sanitized_args; sanitized secrets before printing in CLI commands.

• Supervisor & Circuit Breaker Coordination: Automatically reset circuit breakers on successful supervisor reconnection; added single-flight probe limits in HalfOpen circuit breaker state; implemented 60-second sliding-window restart backoff; pruned removed items during catalog reconciliation; cleaned up circuit breakers on server unmount.

• Resource Caps & Safety Controls: Enforced MAX_BATCH_STEPS = 50 and DEFAULT_BATCH_TIMEOUT_MS = 60_000 execution budget; capped wildcard JSONPath output expansion to 10,000 items and search results to 100; returned POLICY_DENIED (HTTP 403) and 404 for unknown operation cancellation; sanitized CSV audit exports against formula injection.

• CI Quality Gates & Dependency Audits: Integrated native cargo-audit scanning in GitHub Actions CI; updated dependencies resolving all reported advisories.

• CLI Version Flag: Enabled standard --version and -V flags in the warmplane binary parser.

v0.15.0 — Fault Tolerance, Boot Resilience & Control Deck Feature Parity

• Boot Resilience & Degraded Startup: Graceful daemon boot when upstream servers (such as Docker, remote SSE endpoints, or unconfigured tools) fail or timeout. Failed servers are flagged as degraded without crashing the daemon or blocking other healthy upstreams.

• Process Supervisor & Circuit Breakers: Per-server and global circuit breakers (failureThreshold, cooldownMs, autoRestart, maxRestarts) with state tracking (CLOSED, OPEN, HALF-OPEN) and exponential backoff restart supervision.

• Full Web UI Feature Parity:

  • Server Hub: Server card edit workflow (✏️ Edit), live circuit breaker telemetry badges, and server resilience indicators.

  • Template Wizard: Fault tolerance and supervisor configuration accordion directly inside 1-click curated server setup.

  • Interactive Playground: Context distillation controls (_jsonpath, _limit_lines, _truncate_bytes) and execution latency measurements.

  • Responsive Bento-Grid overview cards with real-time health indicator dots (connected 🟢, degraded 🟡, error 🔴).

• CLI Resilience Configuration: warmplane config resilience set and warmplane config resilience show for headless circuit breaker management.

v0.14.0 — Agent Enrichment Suite: Facade Search, Context Distillation & Multi-Step Batching

• MCP Facade Hybrid Search: Exposed capability_search tool over MCP stdio facade with keyword, tag, server ID, and execution mode filters.

• Context Distillation & Truncation: Added _jsonpath, _limit_lines, and _truncate_bytes modifiers to /v1/tools/call and capability_call to protect LLM context windows from oversized outputs.

• Multi-Step Chained Batch Calls: Added POST /v1/tools/batch_call and capabilities_batch_call for single-roundtrip dependent tool executions with $step.field reference interpolation.

v0.13.0 — Human-in-the-Loop (HITL) Approval Engine & Signed Webhooks

• Approval Interceptor: Policy-driven suspension for sensitive capability calls (requireApproval).

• Operator REST API: Endpoints to list (/v1/approvals), inspect, approve with modified arguments (/v1/approvals/:id/approve), or reject (/v1/approvals/:id/reject).

• Signed HMAC Webhooks: Real-time webhook dispatch with SHA-256 HMAC signature headers on approval lifecycle events.

• Configurable TTL Expiration: Automatic timeout expiration (approvalTimeoutSecs) returning structured cancellation envelopes.

v0.12.0 — Cryptographic WORM Audit Log & SIEM Streaming

• Append-only linear SHA-256 hash chaining over tool execution and HITL decision events.

• Audit verification and export endpoints (/v1/audit/...), Splunk HEC and generic Webhook ingestion.

v0.11.0 — Control Deck Web UI & Dynamic Upstream Hot-Reloading

• Control Deck Web UI: Embedded zero-dependency web dashboard at /ui and / with live telemetry, server manager, interactive tool playground, policy/redaction manager, and alias registry.

• Zero-Downtime Dynamic Upstream Mounting: Dynamically mount and unmount stdio, HTTP, and OAuth2 upstream workers via REST/UI/CLI without restarting the daemon process.

• Dynamic Catalogs & ETags: Concurrency-safe state management with automatic SHA256 ETag recomputation and SSE resource notifications on server changes.

• Explicit Config Hot-Reload: Added warmplane reload CLI command and POST /v1/config/reload endpoint to cleanly reconcile in-memory workers against manual edits to mcp_servers.json.

v0.10.0 — CLI Configuration Management & Ecosystem Importers

• Added warmplane server (add, remove, list, get, test) commands with interactive inquire wizards and flag-driven headless automation.

• Added warmplane config (init, show, import, alias, policy) for safe, transactional configuration mutations.

• Added auto-discovery and import from Claude Desktop, Cursor, and Zed settings.

• Added atomic configuration file writes (fs::rename) preventing JSON corruption.

v0.9.0 — MCP 2026-07-28 Spec Compliance, MRTR & Subscriptions

• Upgraded to official MCP Rust SDK rmcp 3.1.2 and reqwest 0.13.

• Set default protocol version to "2026-07-28" with backward compatibility for "2025-11-25".

• Added Multi Round-Trip Requests (MRTR) support (input_responses and request_state) across HTTP REST, stdio facade, and upstream workers.

• Added cache hints (ttl_ms: 300000, cache_scope: "public") and deterministic alphabetical sorting on catalog listings.

• Added subscriptions_listen tool to stdio facade and /v1/resources/updates SSE stream for real-time notifications.

• Validated RFC 9207 / SEP-2468 iss callback verification for OAuth 2.0 flows.

v0.8.0 — Semantic Vector Embeddings & FastEmbed ONNX Pipeline

• Integrated FastEmbed ONNX embedding pipeline with dense cosine vector similarity under optional --features semantic-search.

• Hybrid reciprocal rank fusion combining BM25 keyword matching and dense vector search.

v0.7.0 — Pragmatic Rust Modernization & Builder Patterns

Full adoption of Microsoft's Pragmatic Rust Guidelines (AGENTS.md). Implemented Builder Pattern (M-INIT-BUILDER) for core state (AppStateBuilder), search filters (SearchFilterBuilder), and request context (RequestContextBuilder). Enhanced error safety (M-PANIC-IS-STOP), structured logging (M-LOG-STRUCTURED), canonical documentation (M-CANONICAL-DOCS), and flexible trait interop (M-IMPL-ASREF).

v0.6.0 — Idempotency, Cancellation & Retry Metadata

Pass Idempotency-Key / X-Idempotency-Key to deduplicate concurrent tool calls. Abort any in-flight request via cancel endpoint or CLI. Every response envelope now includes structured "retry" metadata (classification + state) for orchestrator-aware retry logic.

v0.5.0 — Request Context & Correlation

Structured RequestContext (operation_id, work_item_id, actor_id, grant_id) threaded through all execution envelopes and tracing spans. HTTP header fallback (X-Request-ID, X-Operation-ID, X-Actor-ID, X-Grant-ID).

v0.4.0 — Catalog Versioning & Cache Validation

SHA-256 catalog version. ETag headers on all catalog reads, If-None-Match conditional requests returning 304 Not Modified. GET /v1/catalog/events change feed with cursor-based pagination.

v0.3.0 — Hybrid Search

POST /v1/capabilities/search with BM25 scoring, optional FastEmbed vector embeddings, tag/server-ID filters, and ranked results. POST /v1/capabilities/search with BM25 scoring, optional FastEmbed vector embeddings, tag/server-ID filters, and ranked results.

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