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This is an optional step for an app, but they can attach a JSON with the app manual for fastagent to invoke backend calls. This type of integration can drastically improve the efficiency and app connectivity.
Security is modeled in a reusable way with multiple auth options, plus transport, retry, pagination, and observability knobs. 
                      
{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://fastagent.dev/schemas/backend-endpoints.schema.json",
  "title": "FastAgent External Backend Endpoints",
  "type": "object",
  "required": ["endpoints"],
  "properties": {
    "version": { "type": "string", "default": "1.1.0" },
    "trust_stores": {
      "type": "array",
      "items": { "$ref": "#/$defs/TrustStore" }
    },
    "endpoints": {
      "type": "array",
      "items": { "$ref": "#/$defs/Endpoint" },
      "minItems": 1
    }
  },
  "$defs": {
    "Endpoint": {
      "type": "object",
      "required": ["id", "name", "kind", "transport", "timeouts", "config"],
      "properties": {
        "id": { "type": "string", "pattern": "^[a-zA-Z0-9._-]+$" },
        "name": { "type": "string" },
        "description": { "type": "string" },
        "kind": { "type": "string", "enum": ["classical_api", "agentic_mcp"] },
        "transport": {
          "type": "object",
          "required": ["protocol"],
          "properties": {
            "protocol": { "type": "string", "enum": ["http", "https", "ws", "wss", "grpc", "grpcs"] },
            "base_url": { "type": "string", "format": "uri" },
            "grpc_package": { "type": "string" },
            "tls": {
              "type": "object",
              "properties": {
                "verify_peer": { "type": "boolean", "default": true },
                "min_tls_version": { "type": "string", "enum": ["1.2", "1.3"], "default": "1.2" },
                "server_name": { "type": "string" },
                "alpn_protocols": { "type": "array", "items": { "type": "string" } },
                "cipher_suites": { "type": "array", "items": { "type": "string" } },
                "ocsp_stapling_required": { "type": "boolean", "default": false },
                "trust_store_ref": { "type": "string" },
                "ca_bundle_ref": { "$ref": "#/$defs/SecretRef" },
                "pinset": { "$ref": "#/$defs/PinSet" },
                "client_cert_ref": { "$ref": "#/$defs/KeyMaterialRef" },
                "client_key_ref": { "$ref": "#/$defs/KeyMaterialRef" }
              },
              "additionalProperties": false
            },
            "proxy": {
              "type": "object",
              "properties": {
                "http_proxy": { "type": "string", "format": "uri" },
                "https_proxy": { "type": "string", "format": "uri" },
                "no_proxy": { "type": "string" }
              },
              "additionalProperties": false
            }
          },
          "additionalProperties": false
        },

        "security": { "$ref": "#/$defs/SecurityScheme" },
        "security_set": { "$ref": "#/$defs/SecuritySet" },

        "timeouts": {
          "type": "object",
          "properties": {
            "connect_ms": { "type": "integer", "minimum": 0, "default": 5000 },
            "read_ms": { "type": "integer", "minimum": 0, "default": 30000 },
            "overall_ms": { "type": "integer", "minimum": 0 }
          },
          "additionalProperties": false
        },
        "retries": {
          "type": "object",
          "properties": {
            "max_attempts": { "type": "integer", "minimum": 0, "default": 2 },
            "backoff": {
              "type": "object",
              "properties": {
                "strategy": { "type": "string", "enum": ["none", "fixed", "exponential", "jittered"], "default": "exponential" },
                "initial_ms": { "type": "integer", "minimum": 0, "default": 200 },
                "max_ms": { "type": "integer", "minimum": 0, "default": 5000 }
              },
              "additionalProperties": false
            },
            "retry_on": {
              "type": "object",
              "properties": {
                "http_statuses": {
                  "type": "array",
                  "items": { "type": "integer", "minimum": 100, "maximum": 599 },
                  "default": [408, 429, 500, 502, 503, 504]
                },
                "network_errors": { "type": "boolean", "default": true },
                "idempotent_methods_only": { "type": "boolean", "default": true }
              },
              "additionalProperties": false
            }
          },
          "additionalProperties": false
        },
        "rate_limit": {
          "type": "object",
          "properties": {
            "requests_per_minute": { "type": "integer", "minimum": 1 },
            "burst": { "type": "integer", "minimum": 1 },
            "token_bucket_ref": { "type": "string" }
          },
          "additionalProperties": false
        },
        "observability": {
          "type": "object",
          "properties": {
            "log_level": { "type": "string", "enum": ["trace", "debug", "info", "warn", "error"], "default": "info" },
            "redact_headers": { "type": "array", "items": { "type": "string" } },
            "trace": {
              "type": "object",
              "properties": {
                "enabled": { "type": "boolean", "default": false },
                "propagation": { "type": "string", "enum": ["w3c_traceparent", "b3_multi", "b3_single"], "default": "w3c_traceparent" }
              },
              "additionalProperties": false
            },
            "metrics": {
              "type": "object",
              "properties": {
                "enabled": { "type": "boolean", "default": true },
                "namespace": { "type": "string" }
              },
              "additionalProperties": false
            }
          },
          "additionalProperties": false
        },
        "cache": {
          "type": "object",
          "properties": {
            "strategy": { "type": "string", "enum": ["none", "in_memory", "redis"], "default": "none" },
            "ttl_ms": { "type": "integer", "minimum": 0 },
            "key_template": { "type": "string" }
          },
          "additionalProperties": false
        },
        "config": {
          "oneOf": [
            { "$ref": "#/$defs/ClassicalApiConfig" },
            { "$ref": "#/$defs/AgenticMcpConfig" }
          ]
        },
        "tags": { "type": "array", "items": { "type": "string" } },
        "enabled": { "type": "boolean", "default": true }
      },
      "additionalProperties": false,
      "allOf": [
        {
          "if": { "properties": { "kind": { "const": "classical_api" } } },
          "then": { "properties": { "config": { "$ref": "#/$defs/ClassicalApiConfig" } } }
        },
        {
          "if": { "properties": { "kind": { "const": "agentic_mcp" } } },
          "then": { "properties": { "config": { "$ref": "#/$defs/AgenticMcpConfig" } } }
        },
        {
          "if": { "required": ["security_set"] },
          "then": { "not": { "required": ["security"] } }
        }
      ]
    },

    "SecretRef": {
      "type": "object",
      "required": ["ref"],
      "properties": {
        "ref": { "type": "string" },
        "source": { "type": "string", "enum": ["env", "vault", "file", "kms"], "default": "env" },
        "key": { "type": "string" }
      },
      "additionalProperties": false
    },

    "KeyMaterialRef": {
      "type": "object",
      "required": ["ref"],
      "properties": {
        "ref": { "type": "string" },
        "source": { "type": "string", "enum": ["env", "vault", "file", "kms", "hsm"], "default": "env" },
        "format": { "type": "string", "enum": ["PEM", "PKCS12", "JWK", "DER"] },
        "passphrase_ref": { "$ref": "#/$defs/SecretRef" }
      },
      "additionalProperties": false
    },

    "TrustStore": {
      "type": "object",
      "required": ["id"],
      "properties": {
        "id": { "type": "string", "pattern": "^[a-zA-Z0-9._-]+$" },
        "description": { "type": "string" },
        "ca_bundle_ref": { "$ref": "#/$defs/SecretRef" },
        "allowed_dns_names": { "type": "array", "items": { "type": "string" } },
        "pinset": { "$ref": "#/$defs/PinSet" }
      },
      "additionalProperties": false
    },

    "PinSet": {
      "type": "object",
      "properties": {
        "type": { "type": "string", "enum": ["spki_sha256", "cert_sha256"], "default": "spki_sha256" },
        "hashes": {
          "type": "array",
          "minItems": 1,
          "items": { "type": "string", "pattern": "^[A-Fa-f0-9]{64}$" }
        },
        "backup_hashes": {
          "type": "array",
          "items": { "type": "string", "pattern": "^[A-Fa-f0-9]{64}$" }
        },
        "enforce": { "type": "boolean", "default": true }
      },
      "additionalProperties": false
    },

    "SecuritySet": {
      "type": "object",
      "required": ["mode", "schemes"],
      "properties": {
        "mode": { "type": "string", "enum": ["all", "any"], "default": "all" },
        "schemes": {
          "type": "array",
          "minItems": 1,
          "items": { "$ref": "#/$defs/SecurityScheme" }
        }
      },
      "additionalProperties": false
    },

    "SecurityScheme": {
      "type": "object",
      "required": ["type"],
      "properties": {
        "type": {
          "type": "string",
          "enum": ["none", "api_key", "basic", "bearer", "oauth2", "hmac", "sigv4", "mtls", "custom", "jwt"]
        },
        "api_key": {
          "type": "object",
          "properties": {
            "in": { "type": "string", "enum": ["header", "query", "cookie"], "default": "header" },
            "name": { "type": "string", "default": "Authorization" },
            "prefix": { "type": "string", "default": "Bearer " },
            "value_ref": { "$ref": "#/$defs/SecretRef" }
          },
          "additionalProperties": false
        },
        "basic": {
          "type": "object",
          "properties": {
            "username_ref": { "$ref": "#/$defs/SecretRef" },
            "password_ref": { "$ref": "#/$defs/SecretRef" }
          },
          "additionalProperties": false
        },
        "bearer": {
          "type": "object",
          "properties": {
            "token_ref": { "$ref": "#/$defs/SecretRef" },
            "prefix": { "type": "string", "default": "Bearer " }
          },
          "additionalProperties": false
        },
        "oauth2": {
          "type": "object",
          "required": ["flow", "token_endpoint"],
          "properties": {
            "flow": { "type": "string", "enum": ["client_credentials", "authorization_code", "password", "device_code"], "default": "client_credentials" },
            "token_endpoint": { "type": "string", "format": "uri" },
            "scopes": { "type": "array", "items": { "type": "string" } },
            "client_id_ref": { "$ref": "#/$defs/SecretRef" },
            "client_secret_ref": { "$ref": "#/$defs/SecretRef" },
            "audience": { "type": "string" },
            "refresh_leeway_s": { "type": "integer", "minimum": 0, "default": 60 },
            "mtls_bound": {
              "type": "object",
              "properties": {
                "token_endpoint_auth_method": { "type": "string", "enum": ["tls_client_auth", "self_signed_tls_client_auth"] },
                "tls_client_auth_subject_dn": { "type": "string" },
                "client_cert_ref": { "$ref": "#/$defs/KeyMaterialRef" },
                "client_key_ref": { "$ref": "#/$defs/KeyMaterialRef" },
                "trust_store_ref": { "type": "string" },
                "ca_bundle_ref": { "$ref": "#/$defs/SecretRef" }
              },
              "additionalProperties": false
            },
            "dpop": {
              "type": "object",
              "properties": {
                "key_ref": { "$ref": "#/$defs/KeyMaterialRef" },
                "alg": { "type": "string", "default": "ES256" },
                "htm_header": { "type": "string" }
              },
              "additionalProperties": false
            },
            "jwt_client_auth": {
              "type": "object",
              "properties": {
                "audience": { "type": "string" },
                "issuer": { "type": "string" },
                "subject": { "type": "string" },
                "signing_key_ref": { "$ref": "#/$defs/KeyMaterialRef" },
                "alg": { "type": "string", "default": "RS256" },
                "jwks_uri": { "type": "string", "format": "uri" }
              },
              "additionalProperties": false
            }
          },
          "additionalProperties": false
        },
        "hmac": {
          "type": "object",
          "properties": {
            "algorithm": { "type": "string", "enum": ["HMAC-SHA256", "HMAC-SHA1"], "default": "HMAC-SHA256" },
            "key_ref": { "$ref": "#/$defs/SecretRef" },
            "header_name": { "type": "string", "default": "X-Signature" },
            "signing_template": { "type": "string" }
          },
          "additionalProperties": false
        },
        "sigv4": {
          "type": "object",
          "properties": {
            "access_key_ref": { "$ref": "#/$defs/SecretRef" },
            "secret_key_ref": { "$ref": "#/$defs/SecretRef" },
            "region": { "type": "string" },
            "service": { "type": "string" },
            "session_token_ref": { "$ref": "#/$defs/SecretRef" }
          },
          "additionalProperties": false
        },
        "mtls": {
          "type": "object",
          "properties": {
            "client_cert_ref": { "$ref": "#/$defs/KeyMaterialRef" },
            "client_key_ref": { "$ref": "#/$defs/KeyMaterialRef" },
            "trust_store_ref": { "type": "string" },
            "ca_bundle_ref": { "$ref": "#/$defs/SecretRef" },
            "pinset": { "$ref": "#/$defs/PinSet" },
            "require_issuer_dn": { "type": "string" },
            "require_subject_dn": { "type": "string" },
            "require_san_dns": { "type": "array", "items": { "type": "string" } }
          },
          "additionalProperties": false
        },
        "jwt": {
          "type": "object",
          "properties": {
            "bearer_in": { "type": "string", "enum": ["header","cookie"], "default": "header" },
            "header_name": { "type": "string", "default": "Authorization" },
            "prefix": { "type": "string", "default": "Bearer " },
            "token_ref": { "$ref": "#/$defs/SecretRef" },
            "jwks_uri": { "type": "string", "format": "uri" },
            "issuer": { "type": "string" },
            "audience": { "type": "string" }
          },
          "additionalProperties": false
        },
        "custom": {
          "type": "object",
          "properties": {
            "hook": { "type": "string" },
            "params": { "type": "object", "additionalProperties": true }
          },
          "additionalProperties": false
        }
      },
      "additionalProperties": false
    },

    "ClassicalApiConfig": {
      "type": "object",
      "required": ["requests"],
      "properties": {
        "requests": {
          "type": "array",
          "items": { "$ref": "#/$defs/ApiOperation" },
          "minItems": 1
        },
        "error_mapping": {
          "type": "array",
          "items": {
            "type": "object",
            "required": ["match"],
            "properties": {
              "match": {
                "type": "object",
                "properties": {
                  "status": { "type": "integer", "minimum": 100, "maximum": 599 },
                  "body_jsonpath": { "type": "string" },
                  "header_name": { "type": "string" },
                  "header_value_regex": { "type": "string" }
                },
                "additionalProperties": false
              },
              "fastagent_error": { "type": "string" }
            },
            "additionalProperties": false
          }
        }
      },
      "additionalProperties": false
    },

    "ApiOperation": {
      "type": "object",
      "required": ["operation_id", "method", "path"],
      "properties": {
        "operation_id": { "type": "string", "pattern": "^[a-zA-Z0-9._-]+$" },
        "summary": { "type": "string" },
        "method": { "type": "string", "enum": ["GET", "POST", "PUT", "PATCH", "DELETE", "HEAD", "OPTIONS"] },
        "path": { "type": "string" },
        "path_params": {
          "type": "object",
          "additionalProperties": { "$ref": "#/$defs/Parameter" }
        },
        "query": {
          "type": "object",
          "additionalProperties": { "$ref": "#/$defs/Parameter" }
        },
        "headers": {
          "type": "object",
          "additionalProperties": { "$ref": "#/$defs/Parameter" }
        },
        "body": {
          "oneOf": [
            { "type": "null" },
            {
              "type": "object",
              "required": ["content_type"],
              "properties": {
                "content_type": { "type": "string", "enum": ["application/json", "application/x-www-form-urlencoded", "multipart/form-data", "text/plain", "application/octet-stream"] },
                "schema": { "type": "object" }
              },
              "additionalProperties": false
            }
          ]
        },
        "response": {
          "type": "object",
          "properties": {
            "expected_status": {
              "type": "array",
              "items": { "type": "integer", "minimum": 100, "maximum": 599 },
              "default": [200]
            },
            "schema": { "type": "object" }
          },
          "additionalProperties": false
        },
        "pagination": {
          "type": "object",
          "properties": {
            "strategy": { "type": "string", "enum": ["none", "query_page", "cursor", "link_header"], "default": "none" },
            "param_names": {
              "type": "object",
              "properties": {
                "page": { "type": "string", "default": "page" },
                "per_page": { "type": "string", "default": "per_page" },
                "cursor": { "type": "string", "default": "cursor" },
                "limit": { "type": "string", "default": "limit" }
              },
              "additionalProperties": false
            },
            "response_paths": {
              "type": "object",
              "properties": {
                "next_cursor_jsonpath": { "type": "string" },
                "items_jsonpath": { "type": "string" },
                "link_rel_next_header": { "type": "string", "default": "Link" }
              },
              "additionalProperties": false
            },
            "max_pages": { "type": "integer", "minimum": 1, "default": 10 }
          },
          "additionalProperties": false
        },
        "idempotency": {
          "type": "object",
          "properties": {
            "enabled": { "type": "boolean", "default": false },
            "header_name": { "type": "string", "default": "Idempotency-Key" },
            "generator": { "type": "string", "enum": ["uuid4", "hash_body", "custom"], "default": "uuid4" }
          },
          "additionalProperties": false
        },
        "streaming": {
          "type": "object",
          "properties": {
            "enabled": { "type": "boolean", "default": false },
            "mode": { "type": "string", "enum": ["sse", "chunked"] },
            "event_field_jsonpath": { "type": "string" }
          },
          "additionalProperties": false
        }
      },
      "additionalProperties": false
    },

    "Parameter": {
      "type": "object",
      "properties": {
        "style": { "type": "string", "enum": ["simple", "form", "spaceDelimited", "pipeDelimited"], "default": "form" },
        "explode": { "type": "boolean", "default": true },
        "required": { "type": "boolean", "default": false },
        "value": { "oneOf": [{ "type": "string" }, { "type": "number" }, { "type": "boolean" }, { "type": "array", "items": {} }] },
        "from_context": { "type": "string" }
      },
      "additionalProperties": false
    },

    "AgenticMcpConfig": {
      "type": "object",
      "required": ["server"],
      "properties": {
        "server": {
          "type": "object",
          "required": ["transport"],
          "properties": {
            "transport": { "type": "string", "enum": ["stdio", "sse", "websocket"] },
            "url": { "type": "string", "format": "uri" },
            "command": { "type": "string" },
            "args": { "type": "array", "items": { "type": "string" } },
            "env": {
              "type": "object",
              "additionalProperties": { "oneOf": [{ "type": "string" }, { "$ref": "#/$defs/SecretRef" }] }
            },
            "protocol_version": { "type": "string", "default": "2024-11-07" }
          },
          "additionalProperties": false
        },
        "model": {
          "type": "object",
          "properties": {
            "name": { "type": "string" },
            "provider": { "type": "string" },
            "context_window_tokens": { "type": "integer", "minimum": 0 },
            "max_output_tokens": { "type": "integer", "minimum": 1 },
            "temperature": { "type": "number", "minimum": 0 },
            "top_p": { "type": "number", "minimum": 0, "maximum": 1 }
          },
          "additionalProperties": false
        },
        "tools": {
          "type": "array",
          "items": {
            "type": "object",
            "required": ["name"],
            "properties": {
              "name": { "type": "string" },
              "description": { "type": "string" },
              "input_schema": { "type": "object" },
              "rate_limit": {
                "type": "object",
                "properties": {
                  "rpm": { "type": "integer", "minimum": 1 },
                  "rps": { "type": "integer", "minimum": 1 },
                  "burst": { "type": "integer", "minimum": 1 }
                },
                "additionalProperties": false
              },
              "allowed": { "type": "boolean", "default": true }
            },
            "additionalProperties": false
          }
        },
        "routing": {
          "type": "object",
          "properties": {
            "allow_tool_use": { "type": "boolean", "default": true },
            "max_parallel_tools": { "type": "integer", "minimum": 1, "default": 1 },
            "tool_choice": { "type": "string", "enum": ["auto", "required", "none"], "default": "auto" },
            "fallback_chain": { "type": "array", "items": { "type": "string" } }
          },
          "additionalProperties": false
        },
        "session": {
          "type": "object",
          "properties": {
            "system_prompt": { "type": "string" },
            "memory": { "type": "string", "enum": ["none", "ephemeral", "persistent"], "default": "ephemeral" },
            "embeddings_endpoint_id": { "type": "string" }
          },
          "additionalProperties": false
        },
        "streaming": {
          "type": "object",
          "properties": {
            "enabled": { "type": "boolean", "default": true },
            "protocol": { "type": "string", "enum": ["mcp-stream", "sse", "websocket"] }
          },
          "additionalProperties": false
        },
        "schema_contract": {
          "type": "object",
          "properties": {
            "input_schema": { "type": "object" },
            "output_schema": { "type": "object" }
          },
          "additionalProperties": false
        }
      },
      "additionalProperties": false
    }
  }
}
Engineering choice:
Classical API integrations are time tested over the years and optimally best option for creating fault tolerant systems with high degree of redundancy and reliability. Agentic MCP are modern concepts which provide higher flexibility and ease of connecting platforms.
Other Options:

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MS ISV,
Since Oct 2023
kgraph cyberium azure
Azure Kgraph.AI

This AI helped us build 3 great products at record speed.

Anil Valbh,
President, Avista

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