What log query tools does it provide?

It provides tail_log for recent events, filter_log for filtered queries, and summarize_errors for error aggregation.

What logging formats are supported?

The underlying engine supports 14 output formats including Logfmt and JSON.

How do I install the MCP server?

Install via Cargo with 'cargo install rlg-mcp' or run the Docker image 'ghcr.io/sebastienrousseau/rlg-mcp'.

What license governs this software?

It is dual-licensed under MIT or Apache-2.0 licenses.

Rlg

MCP server exposing RustLogs structured log streams as JSON-RPC tools for filtering, tailing, and error summarization.

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.

One-click editor setup isn’t available for this listing yet — we don’t have a confirmed install command, and we’d rather show nothing than point your editor at the wrong package or host. Follow the project’s own setup instructions, linked above.

Manual Client & Custom JSON ConfigExpand JSON ▾

No confirmed setup config for this listing yet. We only publish a config block when the install details come from the project itself — its README, its docs, or a verified owner. We haven’t found those for sebastienrousseau/rlg, and we’d rather show nothing than a guess you’d paste into your client. Follow the project’s own setup instructions for the current steps.

Overview

This MCP server exposes RustLogs (rlg) structured log files as tools accessible to AI agents via JSON-RPC 2.0 over stdio. It provides three main tools: tail_log to fetch the last N log events, filter_log to query logs with JSON-path-style predicates, and summarize_errors to aggregate error counts by component. The underlying logging engine is near-lock-free with a large ring buffer and supports multiple output formats and native OS sinks. Use this server to integrate structured Rust log data into AI workflows for on-call, SRE, or operational analysis.

Use cases

Tail recent log events filtered by level or component

Filter logs using JSON-path-style predicates

Summarize error counts grouped by component

Expose Rust structured logs to AI agents via MCP

Integrate log streams into on-call and SRE workflows

Key features

JSON-RPC 2.0 over stdio transport

Three MCP tools: tail_log, filter_log, summarize_errors

Near-lock-free structured logging engine with 65k-slot ring buffer

Supports 14 output formats including Logfmt and ECS

Native OS sinks: os_log/syslog and journald

Dual MIT/Apache-2.0 license

Capabilities & Tool Schemas (3)Self-reported

Inspect callable tools, capabilities, and parameters exposed to AI agents by Rlg.

tail_log

`path`, optional `n` (default 100) → last `n` parseable records, rendered in Logfmt.

filter_log

`path`, optional `min_level` / `component` / `format` → records matching every supplied filter, in the chosen `LogFormat`.

summarize_errors

`path` → JSON map of `component → error_count` for ERROR-and-above records.

Documentation Overview

RLG logo

rlg — RustLogs

Near-lock-free structured logging for Rust, plus an ecosystem of companion crates: CLI tooling, MCP server, OTLP exporter, tower middleware, WebAssembly bindings, PII redaction, test utilities, and aggregation reports.

This is the Cargo workspace root. The library lives at crates/rlg. Ten companion crates ship from this workspace, all at lockstep version 0.0.11.

The rlg ecosystem

Crate	What it does	Use case
`rlg`	Near-lock-free structured logging engine. 65k-slot ring buffer, deferred formatting, 14 output formats, native OS sinks (`os_log` via `syslog(3)`, `journald`).	Embed structured logging in any Rust binary or library.
`rlg-cli`	`rlg` binary — `jq` for structured logs. Tail, filter, convert across all 14 formats.	Pipe `my-service \| rlg --min-level error --format ecs` from the shell.
`rlg-mcp`	Model Context Protocol server exposing rlg streams as tools to LLM agents.	Claude Desktop, Cursor, mcp.run agents reading your logs.
`rlg-otlp`	OpenTelemetry network exporter (OTLP/HTTP JSON).	Ship records to Honeycomb, Datadog, Tempo, Jaeger, otelcol.
`rlg-tower`	`tower::Layer` emitting per-request structured access logs.	axum, tonic, hyper, `lambda_runtime` — any `tower::Service`.
`rlg-wasm`	`wasm-bindgen` wrapper for browser / Deno / Cloudflare Workers / Bun, plus a WASI 0.2 component interface for wasmtime hosts.	Structured logging from JS or WASI 0.2 components.
`rlg-redact`	PII / secret redaction between `Log::fire()` and the sink. Aho-Corasick fused alternation regex.	Compliance, GDPR, audit-trail safety. Built-in patterns for cards, JWTs, bearers, emails, IPs, AWS keys.
`rlg-test`	Test utilities — capture rlg records in a `#[test]` scope and assert on them with `assert_logged!`.	Downstream library tests verifying their structured log output.
`rlg-report`	Log digest / analytics: count by level, top components, top errors, latency percentiles. CLI + library mode.	Operational dashboards, daily error reports, oncall triage.
`rlg-ebpf`	`Enricher` trait + `ProcessEnricher` (portable) + `EbpfEnricher` scaffold (Linux, behind the `ebpf` feature) for automatic PID / process-name attributes.	Automatic host-level context on every record without app code changes.
`xtask` (internal, unpublished)	`cargo xtask check-all / coverage / audit / doc / examples / bench / release`.	Maintainer automation.

Install one, install all

toml

[dependencies]
rlg         = "0.0.12"
rlg-otlp    = "0.0.12"  # ship to an OTLP collector
rlg-tower   = "0.0.12"  # HTTP middleware
rlg-redact  = "0.0.12"  # PII redaction

[dev-dependencies]
rlg-test    = "0.0.12"  # assertions in your tests

CLI binaries:

bash

cargo install rlg-cli       # the `rlg` binary
cargo install rlg-mcp       # the `rlg-mcp` MCP server
cargo install rlg-report    # the `rlg-report` digest tool

Tools

The MCP server crate, rlg-mcp, exposes rlg log streams to LLM agents as three MCP tools over the stdio transport:

tail_log — path, optional n (default 100) → last n parseable records, rendered in Logfmt.
filter_log — path, optional min_level / component / format → records matching every supplied filter, in the chosen LogFormat.
summarize_errors — path → JSON map of component → error_count for ERROR-and-above records.

Workspace layout

text

.
├── Cargo.toml            # workspace manifest (profiles, members)
├── README.md             # ← you are here
├── CHANGELOG.md / CONTRIBUTING.md / SECURITY.md
├── LICENSE-{APACHE,MIT}
├── crates/
│   ├── rlg/              # core library
│   ├── rlg-cli/          # `rlg` binary + filter/render lib
│   ├── rlg-mcp/          # MCP server
│   ├── rlg-otlp/         # OTLP/HTTP exporter
│   ├── rlg-tower/        # tower::Layer
│   ├── rlg-wasm/         # wasm-bindgen + WASI 0.2 component
│   ├── rlg-redact/       # PII / secret scrubber (Aho-Corasick)
│   ├── rlg-test/         # test utilities
│   ├── rlg-report/       # log digest binary + lib
│   ├── rlg-ebpf/         # Enricher trait + eBPF (Linux) scaffold
│   └── xtask/            # internal automation (publish = false)
└── .github/
    └── workflows/
        ├── ci.yml        # delegates to sebastienrousseau/pipelines
        └── release.yml   # workspace-aware crates.io publisher

Quick links

Core docs: crates/rlg/README.md · docs.rs/rlg
Contributing & signing policy: CONTRIBUTING.md
Security policy: SECURITY.md
Release notes: CHANGELOG.md

License

Dual-licensed under Apache 2.0 or MIT, at your option.

Read the full README →View source on GitHub →

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Adoption & maintenance

Factual signals from GitHub, npm, and our automated checks — not a rating.

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Last commit

11d ago

Most recent push to the default branch.

Tools exposed

Callable tools this server registers over MCP.

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Frequently Asked Questions about Rlg

It uses JSON-RPC 2.0 over standard input/output (stdio).

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