mcp-proxy 0.3.1

Standalone MCP proxy -- config-driven reverse proxy with auth, rate limiting, and observability
Documentation 
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# Compliance & Financial Services Proxy
#
# Strict controls for regulated environments. Every tool call is audited,
# argument sizes are limited, and only explicitly approved tools are exposed.
# Rate limits and circuit breakers protect downstream systems.
#
# See: docs/architectures.md #2

[proxy]
name = "compliance-proxy"
version = "1.0.0"
separator = "/"
instructions = "Compliance-controlled proxy. All actions are audited. Contact compliance@corp.com for tool access requests."

[proxy.listen]
host = "0.0.0.0"
port = 8080

# JWT auth via internal IdP
[auth]
type = "jwt"
issuer = "https://auth.internal.corp.com"
audience = "mcp-compliance"
jwks_uri = "https://auth.internal.corp.com/.well-known/jwks.json"

[[auth.roles]]
name = "analyst"
allow_tools = [
    "market-data/get_quote",
    "market-data/get_history",
    "docs/search",
    "docs/get_page",
]

[[auth.roles]]
name = "trader"
allow_tools = [
    "market-data/*",
    "orders/create_order",
    "orders/cancel_order",
    "orders/get_status",
    "risk/check_exposure",
]

[[auth.roles]]
name = "compliance-officer"
# Empty = all tools allowed

[auth.role_mapping]
claim = "roles"
mapping = { "mcp:analyst" = "analyst", "mcp:trader" = "trader", "mcp:compliance" = "compliance-officer" }

# --- Backends ---

[[backends]]
name = "market-data"
transport = "http"
url = "http://market-data-mcp.internal:8080"
expose_tools = ["get_quote", "get_history", "get_instrument"]

[backends.timeout]
seconds = 5

[backends.rate_limit]
requests = 100
period_seconds = 1

[backends.circuit_breaker]
failure_rate_threshold = 0.3
minimum_calls = 20
wait_duration_seconds = 60

[backends.cache]
resource_ttl_seconds = 10
tool_ttl_seconds = 5
max_entries = 5000

[[backends]]
name = "orders"
transport = "http"
url = "http://order-mcp.internal:8080"
expose_tools = ["create_order", "cancel_order", "get_status"]

[backends.timeout]
seconds = 10

[backends.rate_limit]
requests = 5
period_seconds = 1

[backends.retry]
max_retries = 2
initial_backoff_ms = 200
max_backoff_ms = 2000

[backends.concurrency]
max_concurrent = 3

[[backends]]
name = "risk"
transport = "http"
url = "http://risk-mcp.internal:8080"
expose_tools = ["check_exposure", "get_limits"]

[backends.timeout]
seconds = 15

[[backends]]
name = "docs"
transport = "http"
url = "http://docs-mcp.internal:8080"

[backends.timeout]
seconds = 30

[backends.cache]
resource_ttl_seconds = 600
tool_ttl_seconds = 120
max_entries = 2000

# --- Security & Observability ---

[security]
max_argument_size = 65536  # 64KB -- strict limit

[performance]
coalesce_requests = true

[observability]
audit = true
log_level = "info"
json_logs = true

[observability.metrics]
enabled = true

[observability.tracing]
enabled = true
endpoint = "http://otel-collector.internal:4317"
service_name = "mcp-compliance-proxy"