Tools operators

The Tools family contains 3 operators. Surface external tools (MCP, function-call style).

Operators in this family

• tools.call
• tools.list
• tools.mcp

tools.call

Invokes one of the built-in tools (calculator, datetime, regex_match, json_path, http_fetch).

Version 1.0.0 · Semantics passthrough

Config

Field	Type	Required	Default	Description
args	object	no	—	Tool-specific arguments. See tools.list for argument schemas.
tool	”calculator” | “datetime” | “regex_match” | “json_path” | “http_fetch”	yes	—	Which built-in tool to call.

Input ports

Port	Type	Required	Description
input	any	no	Input

Output ports

Port	Type	Required	Description
output	any	no	Output

tools.list

Returns the static catalog of built-in tools and their argument schemas.

Version 1.0.0 · Semantics passthrough · Idempotent · Visibility advanced

Config

Field	Type	Required	Default	Description
filter	string	no	—	Optional substring filter on tool name or description.

Input ports

No input ports.

Output ports

Port	Type	Required	Description
output	object	no	Output

tools.mcp

Connects to an MCP server and exposes its tools.

Version 1.0.0 · Semantics side_effect · Visibility advanced

Config

Field	Type	Required	Default	Description
server_url	string	yes	—	MCP server endpoint.
tool_filter	string[]	no	—	Whitelist tool names (empty = all).
transport	”stdio” | “sse” | “http”	no	"sse"

Input ports

Port	Type	Required	Description
input	any	yes	Input

Output ports

Port	Type	Required	Description
output	any	no	Output
tool_results	array	no	Tool Results

Source schemas

Every operator above is rendered from its JSON schema in /opt/glyph/schemas/operators/:

• schemas/operators/tools.call.json
• schemas/operators/tools.list.json
• schemas/operators/tools.mcp.json