LoongSuite observability for DeepSeek Harness

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@loongsuite/dsh-plugin is a standalone, open-source observability plugin for DeepSeek Harness (dsh). It observes DSH's native session, agent loop, LLM stream, and tool lifecycle, converts them into OpenTelemetry GenAI traces and metrics, and exports standard OTLP/HTTP protobuf to any compatible backend.

LoongSuite is an open-source observability collection ecosystem built on OpenTelemetry. This repository is its native DSH integration. The plugin does not depend on or require LoongSuite Pilot, a sidecar, a local JSONL tap, or any particular vendor's backend.

Status: stable 0.1.x release. Install @loongsuite/dsh-plugin from npm or the DSH plugin market.

One DSH turn exported over OTLP into self-hosted Langfuse: four react steps, per-call latency and token counts, a failed web_search followed by bash fallbacks, and the ENTRY span's GenAI attributes. Content capture was enabled for this capture; it is off by default.

Data model

DSH session/event + llm/stream
                │
                ▼
      lifecycle coordinator
                │
                ▼
   LoongSuite GenAI OTel utility
                │
                ▼
 private TracerProvider + MeterProvider
                │  OTLP/HTTP protobuf
                ▼
  any OpenTelemetry-compatible backend

One DSH turn produces a single trace with this shape:

ENTRY
└── AGENT
    └── STEP
        ├── LLM
        └── TOOL

Each real LLM attempt gets its own LLM span, so retries remain visible under the same step. Tool calls are correlated with their results by DSH call ID. Errors, aborts, incomplete streams, and plugin shutdown close live spans with an error status instead of leaving them open. Subagent sessions create their own trace and carry DSH parent-session and delegation attributes.

When content capture is enabled, ENTRY and AGENT input messages contain only the turn's direct source.kind=user input. Synthetic DSH context such as runtime snapshots, agent instructions, skill catalogs, goals, and coordinator relays remains visible on the LLM span, but prior-turn conversation history is excluded so every trace contains only its own turn context. Later LLM spans in a tool loop retain assistant tool calls and tool results produced earlier in the same turn. ENTRY and AGENT output messages contain only the final stop response; a turn that never reaches stop falls back to its last available assistant message.

The plugin also exports the standard gen_ai.client.operation.duration and gen_ai.client.token.usage metrics. It does not export OpenTelemetry logs; it can coexist with a separate DSH log exporter.

GenAI invocation construction and semantic attributes are powered by the @loongsuite/otel-util-genai SDK.

Compatibility

DSH release candidates older than 0.1.0-rc.6 are not supported. Each plugin release is tested against the latest published DSH version rather than treating successful bundle composition alone as full runtime compatibility.

Install and run

If you have no OTLP backend yet, examples/quickstart starts a local Jaeger backend and gets you a trace in three commands.

Add the plugin to every DSH profile you want to observe:

dsh plugin --profile web add @loongsuite/dsh-plugin
dsh plugin --profile headless add @loongsuite/dsh-plugin

For local development, replace the package name with the checkout path:

dsh plugin --profile web add /absolute/path/to/dsh-plugin

Set a service name and an OTLP/HTTP collector endpoint, then start that profile normally:

export OTEL_SERVICE_NAME=dsh-agent
export OTEL_EXPORTER_OTLP_ENDPOINT=http://localhost:4318
export OTEL_EXPORTER_OTLP_HEADERS='authorization=Bearer%20your-token'

dsh --profile web
# or: dsh --profile headless "summarize this workspace"

The shared endpoint is expanded to /v1/traces and /v1/metrics. The exporter uses the standard OpenTelemetry default when no endpoint is configured.

Configure the plugin

Environment variables are enough for most deployments. You can also edit the plugin row in $DSH_HOME/profiles/<profile>/cordis.patch.yml (by default under ~/.dsh):

- id: loongsuite-observability
  config:
    endpoint: http://localhost:4318
    serviceName: dsh-agent
    headers:
      authorization: Bearer your-token
    resourceAttributes:
      deployment.environment.name: development
    captureContent: false
    exportMetrics: true

Explicit plugin settings take precedence over environment variables.

To enable content capture without editing the profile, set the GenAI content mode before starting DSH:

export OTEL_INSTRUMENTATION_GENAI_CAPTURE_MESSAGE_CONTENT=SPAN_ONLY
dsh --profile web

Supported standard OpenTelemetry variables are:

• OTEL_EXPORTER_OTLP_ENDPOINT
• OTEL_EXPORTER_OTLP_TRACES_ENDPOINT and OTEL_EXPORTER_OTLP_METRICS_ENDPOINT
• OTEL_EXPORTER_OTLP_HEADERS
• OTEL_EXPORTER_OTLP_TRACES_HEADERS and OTEL_EXPORTER_OTLP_METRICS_HEADERS
• OTEL_SERVICE_NAME
• OTEL_RESOURCE_ATTRIBUTES
• OTEL_INSTRUMENTATION_GENAI_CAPTURE_MESSAGE_CONTENT (SPAN_ONLY or SPAN_AND_EVENT enables span content when captureContent is omitted)
• OTEL_METRICS_EXPORTER (none disables metrics when exportMetrics is omitted)

Header and resource values use the standard comma-separated, percent-encoded key=value syntax.

Privacy and runtime behavior

Content capture is off by default. With that default, prompts, responses, tool schemas, arguments, and results are not attached to spans; structural metadata and token counts are still exported. Enabling captureContent or setting the content-capture environment variable to SPAN_ONLY or SPAN_AND_EVENT can send source code, credentials, personal data, or other sensitive content to the configured backend. Review backend retention and access controls before enabling it. Set captureContent: false explicitly when a profile must remain content-free regardless of the process environment.

The plugin owns private OpenTelemetry providers and never replaces DSH's or another library's global provider. It also disposes listeners and flushes providers with the DSH plugin lifecycle. When attached to an already-running/HMR-reloaded profile, it adopts existing session identities but starts collection at the next native turn/start; historical events are not replayed or duplicated.

Development

Node.js 22.19 or newer and pnpm are required.

pnpm install
pnpm run check
pnpm test
pnpm run build
pnpm pack

See CONTRIBUTING.md for the implementation invariants and release checklist.

License

Apache-2.0