Frontmcp Observability

What it does

When your agent uses it

• Structured logging
• Monitoring to a FrontMCP server

Example prompts

• “/frontmcp-observability”

Requirements

• Node.js

Workflow steps

3 steps, taken from the step headings in SKILL.md.

1. 1Choose What You Need
2. 2Enable Observability
3. 3Read the Relevant Reference

What it can do on your machine

Read from SKILL.md and the folder at commit 8f59ba8. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Shell commands in SKILL.md call:

  • npm

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  Links to these hosts (documentation or services it may open):

  • docs.agentfront.dev

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Frontmcp Observability loads about 4.6k tokens when it runs, and up to ~18k if it reads all its reference files. Until then it costs about 197 tokens; SKILL.md has 1,132 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~197

When it runs · the whole SKILL.md, loaded when a task matches

~4.6k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~18k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from agentfront/frontmcp at commit 8f59ba8, republished under its Apache-2.0 licence (© agentfront). 1,132 words, ~4,594 tokens.

name

frontmcp-observability

description

Use when adding tracing, structured logging, metrics, or monitoring to a FrontMCP server. Covers zero-config OpenTelemetry distributed tracing across all flows; the this.telemetry API for custom spans, events, and attributes in tools, plugins, agents, and skills; structured JSON logging with trace correlation and configurable sinks (Winston, Pino, stdout); the off-by-default /metrics endpoint (process and framework metrics, Prometheus-compatible); vendor integrations (Coralogix, Datadog, Logz.io, Grafana Cloud, or any OTLP backend); and testing spans, log correlation, and instrumentation. Triggers: observability, telemetry, tracing, logging, monitoring, OpenTelemetry, OTel, spans, metrics, Prometheus, Datadog, Coralogix, Logz.io, Grafana, Winston, Pino.

tags

router, observability, telemetry, tracing, logging, monitoring, opentelemetry, otel, spans

category

observability

targets

all

bundle

recommended, full

priority

10

visibility

both

license

Apache-2.0

metadata.docs

https://docs.agentfront.dev/frontmcp/guides/observability

@FrontMcp({
  observability: true,
})

@FrontMcp({
  observability: {
    tracing: true,
    logging: { sinks: [{ type: 'stdout' }] },
    requestLogs: true,
  },
})

© agentfront, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 19 other files (references) in libs/skills/catalog/frontmcp-observability of agentfront/frontmcp.

• SKILL.md
• examples/metrics-endpoint/enable-metrics-endpoint.md
• examples/structured-logging/stdout-logging.md
• examples/structured-logging/winston-integration.md
• examples/telemetry-api/agent-nested-tracing.md
• examples/telemetry-api/plugin-telemetry.md
• examples/telemetry-api/skill-counters.md
• examples/telemetry-api/tool-custom-spans.md
• examples/testing-observability/test-custom-spans.md
• examples/testing-observability/test-log-correlation.md
• examples/tracing-setup/basic-tracing.md
• examples/tracing-setup/production-tracing.md
• examples/vendor-integrations/coralogix-setup.md
• references
• … and 6 more

Open the folder on GitHubat commit 8f59ba8