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Every span produced by the auto-instrumentation includes a set of attributes out of the box. Some are unconditional, others appear under specific configurations.

Always present

Attribute	Type	Description
`mcp.method.name`	string	Always `"tools/call"` for tool invocations.
`mcp.tool.name`	string	The tool name passed to `registerTool`.
`mcp.tool.title`	string	Tool title from the tool config (may be undefined if not set).
`mcp.tool.description`	string	Tool description from the tool config.
`mcp.request.id`	string	UUID generated per request. Unique per call.
`mcp.session.id`	string	UUID generated when the SDK starts. Constant for the process.
`mcp.operation.success`	boolean	`true` on OK, `false` on thrown error.
`mcp.operation.duration`	number	Duration in ms.
`client.address`	string	First non-internal IPv4 address of the host. Falls back to `"localhost"`.

Conditional

When `enableArgumentCollection: true`

Each tool argument is flattened into a mcp.request.argument.<key> attribute. Nested objects use dot notation.

mcp.request.argument.weightKg = 70
mcp.request.argument.heightM = 1.75
mcp.request.argument.metadata.locale = 'en-US'

Off by default — these often contain user input or PII.

When the handler is wrapped with `safetyCheck`

Attribute	Type	Description
`mcp.safety_check.content`	string	Original content passed to the safety API.
`mcp.safety_check.flagged`	boolean	`true` if Sedata’s API flagged the input.
`mcp.safety_check.latency_ms`	number	Round-trip latency of the safety check.
`mcp.safety_check.success`	boolean	`true` if the safety API responded OK (regardless of verdict).

When `process.env.PORT` is set

Attribute	Type	Description
`client.port`	string	Value of `process.env.PORT`.

On error

Attribute	Type	Description
`error.type`	string	Error class name (e.g. `"TypeError"`).
`error.message`	string	Error message.

Resource attributes

Attached once per process and merged into every export:

Attribute	Source
`service.name`	`config.serverName`
`service.version`	`config.serverVersion`
`mcp.session.id`	UUID per process
Host / OS / env detector attrs	`@opentelemetry/resources` detectors

Filtering reference for dashboards

Common filter patterns:

service.name = "weather-mcp"
mcp.tool.name = "calculate-bmi"
mcp.operation.success = false
mcp.safety_check.flagged = true

Tracing concept

How attributes get attached to spans.

Data processors

Mutate or remove attributes before export.

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Automatic attributes

Always present

Conditional

When `enableArgumentCollection: true`

When the handler is wrapped with `safetyCheck`

When `process.env.PORT` is set

On error

Resource attributes

Filtering reference for dashboards

See also

Tracing concept

Data processors

​Always present

​Conditional

​When enableArgumentCollection: true

​When the handler is wrapped with safetyCheck

​When process.env.PORT is set

​On error

​Resource attributes

​Filtering reference for dashboards

​See also

Tracing concept

Data processors

Always present

Conditional

When `enableArgumentCollection: true`

When the handler is wrapped with `safetyCheck`

When `process.env.PORT` is set

On error

Resource attributes

Filtering reference for dashboards

See also