Kimetsu

Kimetsu (kimetsu.dev) is Rodrigo Córdoba's open-source infrastructure for coding agents. Kimetsu itself is a local, model-free memory sidecar — one Rust binary and one SQLite brain per project — that Claude Code, Codex, Cursor, Pi and OpenClaw load as a local-stdio MCP server (~28 kimetsu_* tools), with a CLI, npm/cargo/PyPI packages, a self-hostable Kimetsu Remote HTTP MCP server and published benchmark numbers. The domain also operates agents.kimetsu.dev, a credential-free, read-only Agent Gateway with a published OpenAPI 3.1.0 (15 operations), an A2A Agent Card served at the RFC 8615 path (0.3 by default, 1.0 negotiated with the A2A-Version header) and a live JSON-RPC guide for Sidequest Commons — the maintainer's daily public project-selection loop run through GitHub issues and reactions — plus llms.txt on two hosts, a /.well-known/kimetsu-agents.json discovery pointer and JSON Schemas for its discovery documents. Everything is MIT OR Apache-2.0. Seeded from the A2A Registry listing dev.kimetsu.sidequest_commons_guide under the harvest name "Sidequest Commons".

Kimetsu publishes 5 API contracts indexed on the APIs.io network, including A2A API, Discovery API, Sidequest API, and 2 more. Tagged areas include Company, AI Agents, Agent Memory, Coding Agents, and MCP.

Kimetsu’s developer surface includes documentation, API reference, getting-started guide, support, changelog, CLI, authentication, and 33 more developer resources.

🌐 Visit website 📡 Source on GitHub
44.9/100 developing ▬ flat Agent 33/100 agent ready Front door AI 4/6 moderate Full breakdown ↓
scored 2026-10-09 · rubric v0.23.0
4 published contracts 1 MCP Servers
CompanyAI AgentsAgent MemoryCoding AgentsMCPA2ADeveloper ToolsOpen SourceRustAgent DiscoveryPublic Goods

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-10-09 · rubric v0.23.0
Composite quality — 44.9/100 · developing
Contract Quality 9.1 / 19
Developer Ergonomics 11.4 / 15
Access Clarity 0.0 / 15
Operational Transparency 6.2 / 10
Contract Governance 1.6 / 9
Discoverability 5.1 / 8
Regulatory Posture 3.4 / 15
Create-or-Update Ergonomics 0.0 / 10
Agent readiness — 33/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
Documented Reversibility 0 / 6
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 0 / 6
Agent Skills 5 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 8 / 8
Dry-Run / Simulate Mode 0 / 4
Delegated User Identity 0 / 6
Protected Resource Metadata 0 / 5
Registration Without a Human 0 / 6
Agentic Commerce Well-Known Document 0 / 5
Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.
Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.
The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/kimetsu-dev: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 5

Individual APIs this provider publishes, each with its own machine-readable definition.

Sidequest Commons Guide (A2A)

A2A agent (JSON-RPC; 0.3 message/send by default, 1.0 SendMessage with A2A-Version 1.0) that returns deterministic, credential-free guidance on discovering Sidequest Commons and...

Kimetsu MCP Server (local stdio)

The memory product's agent surface: `kimetsu mcp serve` exposes ~28 kimetsu_* tools (context retrieval, lesson recording, memory CRUD and curation, citations, conflict resolutio...

Kimetsu A2A API

Deterministic guidance; no delegated actions or writes.

Kimetsu Discovery API

Static, anonymous machine-discovery documents.

Kimetsu Sidequest API

Read-only Sidequest Commons public data.

Arazzo Workflows 1

Multi-step API workflows described with the Arazzo specification.

Discover Sidequest Commons and ask the A2A guide

Read the gateway directory, the participation gateway (quotas + GitHub action endpoints) and the proposal feed, then ask the deterministic A2A guide how to participate. Anonymou...

ARAZZO

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Kimetsu MCP Server

Kimetsu ships its MCP server inside the kimetsu binary: `kimetsu mcp serve` is a local stdio server that hosts (Claude Code, Codex, Cursor, Pi, OpenClaw, Gemini CLI) launch per ...

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Kimetsu Dev Plans Pricing

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Kimetsu Dev Rate Limits

6 limits

RATE LIMITS

OpenAPI Overlays 1

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Kimetsu Dev Agent Gateway Overlay

13 actions · documentation · kimetsu-dev-agent-gateway-openapi.yml

UNRECORDED

JSON Schema 3

Standalone JSON Schema definitions for this provider's data models.

kimetsu.dev agent directory

11 properties

JSON SCHEMA

Sidequest Commons machine proposal

10 properties

JSON SCHEMA

kimetsu.dev well-known agent directory pointer

10 properties

JSON SCHEMA

Security Posture 3

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Kimetsu Dev Authentication

none · 0 schemes

SECURITY

Kimetsu Dev Domain Security

TLSv1.3 · DNSSEC

SECURITY

Kimetsu Dev Vulnerability Disclosure

contact published

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Kimetsu Dev Agentic Access

15 operations · 1 acting

15 operations · 1 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted

Documentation 3

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference
 JSONSchema
JSONSchema

Agent Surfaces 8

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess
 LLMsTxt
LLMsTxt
 LLMsTxt
LLMsTxt
 WellKnown
WellKnown
 MCPServer
MCPServer
 AgentSkill
AgentSkill
 AgentSkill
AgentSkill
 AgentSkill
AgentSkill

Scroll for all 8

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Conformance
Conformance
 ErrorCatalog
ErrorCatalog
 Lifecycle
Lifecycle
 Conventions
Conventions
 DataModel
DataModel
 Arazzo
Arazzo

Build 6

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 SourceCode
SourceCode
 ToolCrosswalk
ToolCrosswalk
 Packages
Packages
 SDKs
SDKs
 CLI
CLI

Access & Security 4

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Security
Security
 Authentication
Authentication
 VulnerabilityDisclosure
VulnerabilityDisclosure

Operate 4

Status, limits, changes, and where to get help

Support
Support
 ChangeLog
ChangeLog
 ChangeLog
ChangeLog
 RateLimits
RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

License
License
 Plans
Plans

Company 1

The organization behind the API

Website
Website

Other 4

Properties that don't map to a standard resource type

Robots
Robots
 AgentCard
AgentCard
 Overlay
Overlay
 RegulatoryPosture
RegulatoryPosture

Source (apis.yml)

apis.yml Raw ↑ 
aid: kimetsu-dev
name: Kimetsu
description: Kimetsu (kimetsu.dev) is Rodrigo Córdoba's open-source infrastructure for coding agents. Kimetsu itself is a
  local, model-free memory sidecar — one Rust binary and one SQLite brain per project — that Claude Code, Codex, Cursor, Pi
  and OpenClaw load as a local-stdio MCP server (~28 kimetsu_* tools), with a CLI, npm/cargo/PyPI packages, a self-hostable
  Kimetsu Remote HTTP MCP server and published benchmark numbers. The domain also operates agents.kimetsu.dev, a credential-free,
  read-only Agent Gateway with a published OpenAPI 3.1.0 (15 operations), an A2A Agent Card served at the RFC 8615 path (0.3
  by default, 1.0 negotiated with the A2A-Version header) and a live JSON-RPC guide for Sidequest Commons — the maintainer's
  daily public project-selection loop run through GitHub issues and reactions — plus llms.txt on two hosts, a /.well-known/kimetsu-agents.json
  discovery pointer and JSON Schemas for its discovery documents. Everything is MIT OR Apache-2.0. Seeded from the A2A Registry
  listing dev.kimetsu.sidequest_commons_guide under the harvest name "Sidequest Commons".
image: https://kimetsu.dev/kimetsu-logo.png
url: https://raw.githubusercontent.com/api-evangelist/kimetsu-dev/refs/heads/main/apis.yml
x-type: company
x-source: harvest:a2a-registry
x-tier: profiled
x-tier-reason: full enrichment pass 2026-09-19 (a2a-registry harvest origin; renamed from the registry's provider.organization
  "Sidequest Commons" to the domain's own product name)
specificationVersion: '0.20'
created: '2026-09-19'
modified: '2026-09-19'
tags:
- Company
- AI Agents
- Agent Memory
- Coding Agents
- MCP
- A2A
- Developer Tools
- Open Source
- Rust
- Agent Discovery
- Public Goods
tags_raw:
- Company
- AI Agents
- Agent Memory
- Coding Agents
- MCP
- A2A
- Developer Tools
- Open Source
- Rust
- Agent Discovery
- Public Goods
- Open-Source
apis:
- aid: kimetsu-dev:sidequest-commons-guide
  name: Sidequest Commons Guide (A2A)
  description: 'A2A agent (JSON-RPC; 0.3 message/send by default, 1.0 SendMessage with A2A-Version 1.0) that returns deterministic,
    credential-free guidance on discovering Sidequest Commons and on proposing, voting and contributing through GitHub. Two
    skills: discover_sidequests, explain_participation. No streaming, push notifications or tasks; performs no writes and
    rejects credentials. Listed in the A2A Registry as dev.kimetsu.sidequest_commons_guide.'
  humanURL: https://rodcor.github.io/sidequest-commons/agents/
  baseURL: https://agents.kimetsu.dev/a2a/sidequest
  tags:
  - A2A
  - AI Agents
  - Open Source
  - Public Goods
  tags_raw:
  - A2A
  - AI Agents
  - Open Source
  - Public Goods
  - Open-Source
  properties:
  - type: AgentCard
    url: a2a/kimetsu-dev-a2a.yml
  - type: AgentCard
    name: Agent Card (provider-hosted)
    url: https://agents.kimetsu.dev/.well-known/agent-card.json
  - type: Documentation
    url: https://github.com/RodCor/sidequest-commons/blob/main/AGENT_GATEWAY.md
  - type: LLMsTxt
    url: llms/kimetsu-dev-sidequest-commons-llms.txt
  - type: JSONSchema
    name: proposal-v1 machine input schema
    url: json-schema/kimetsu-dev-sidequest-proposal-v1.schema.json
  - type: SourceCode
    url: https://github.com/RodCor/sidequest-commons
  image: https://kimetsu.dev/kimetsu-logo.png
- aid: kimetsu-dev:kimetsu-mcp-server
  name: Kimetsu MCP Server (local stdio)
  description: 'The memory product''s agent surface: `kimetsu mcp serve` exposes ~28 kimetsu_* tools (context retrieval, lesson
    recording, memory CRUD and curation, citations, conflict resolution, embedding-model management, repo ingest, skill bridge)
    over stdio to Claude Code, Codex, Cursor, Pi, OpenClaw and Gemini CLI, backed by a per-project SQLite brain with no cloud
    and no telemetry. No provider-hosted endpoint; Kimetsu Remote (beta) lets an operator self-host the same surface over
    HTTP MCP with bearer tokens. Distributed as npm kimetsu-ai, crates.io kimetsu-cli and GitHub Release archives (v2.8.0,
    2026-09-09).'
  humanURL: https://kimetsu.dev/docs/how-kimetsu-works/interfaces/
  tags:
  - MCP
  - Agent Memory
  - Coding Agents
  - Developer Tools
  properties:
  - type: MCPServer
    url: mcp/kimetsu-dev-mcp.yml
  - type: ToolCrosswalk
    url: mcp/kimetsu-dev-tool-crosswalk.yml
  - type: Documentation
    url: https://kimetsu.dev/docs/how-kimetsu-works/interfaces/
  - type: GettingStarted
    url: https://kimetsu.dev/docs/install/
  - type: CLI
    url: cli/kimetsu-dev-cli.yml
  - type: Packages
    url: packages/kimetsu-dev-packages.yml
  - type: AgentSkill
    name: kimetsu-brain (provider-published Pi skill, verbatim)
    url: skills/kimetsu-dev-kimetsu-brain-SKILL.md
  - type: SourceCode
    url: https://github.com/RodCor/kimetsu
  image: https://kimetsu.dev/kimetsu-logo.png
- aid: kimetsu-dev:kimetsu-dev-a2a-api
  name: Kimetsu A2A API
  description: Deterministic guidance; no delegated actions or writes.
  humanURL: https://kimetsu.dev/projects/
  baseURL: https://agents.kimetsu.dev
  tags:
  - A2A
  properties:
  - type: OpenAPI
    url: openapi/kimetsu-dev-a2a-api-openapi.yml
  - type: Documentation
    url: https://kimetsu.dev/projects/
  - type: APIReference
    url: https://agents.kimetsu.dev/openapi.json
  - type: LLMsTxt
    url: llms/kimetsu-dev-agent-gateway-llms.txt
  - type: Arazzo
    url: arazzo/kimetsu-dev-discover-and-ask-workflow.yml
  - type: ErrorCatalog
    url: errors/kimetsu-dev-problem-types.yml
  - type: Authentication
    url: authentication/kimetsu-dev-authentication.yml
  - type: RateLimits
    url: rate-limits/kimetsu-dev-rate-limits.yml
  - type: DataModel
    url: data-model/kimetsu-dev-data-model.yml
  - type: JSONSchema
    url: json-schema/kimetsu-dev-agent-directory-v1.schema.json
- aid: kimetsu-dev:kimetsu-dev-discovery-api
  name: Kimetsu Discovery API
  description: Static, anonymous machine-discovery documents.
  humanURL: https://kimetsu.dev/projects/
  baseURL: https://agents.kimetsu.dev
  tags:
  - Discovery
  properties:
  - type: OpenAPI
    url: openapi/kimetsu-dev-discovery-api-openapi.yml
  - type: Documentation
    url: https://kimetsu.dev/projects/
  - type: APIReference
    url: https://agents.kimetsu.dev/openapi.json
  - type: LLMsTxt
    url: llms/kimetsu-dev-agent-gateway-llms.txt
  - type: Arazzo
    url: arazzo/kimetsu-dev-discover-and-ask-workflow.yml
  - type: ErrorCatalog
    url: errors/kimetsu-dev-problem-types.yml
  - type: Authentication
    url: authentication/kimetsu-dev-authentication.yml
  - type: RateLimits
    url: rate-limits/kimetsu-dev-rate-limits.yml
  - type: DataModel
    url: data-model/kimetsu-dev-data-model.yml
  - type: JSONSchema
    url: json-schema/kimetsu-dev-agent-directory-v1.schema.json
- aid: kimetsu-dev:kimetsu-dev-sidequest-api
  name: Kimetsu Sidequest API
  description: Read-only Sidequest Commons public data.
  humanURL: https://kimetsu.dev/projects/
  baseURL: https://agents.kimetsu.dev
  tags:
  - Sidequest
  properties:
  - type: OpenAPI
    url: openapi/kimetsu-dev-sidequest-api-openapi.yml
  - type: Documentation
    url: https://kimetsu.dev/projects/
  - type: APIReference
    url: https://agents.kimetsu.dev/openapi.json
  - type: LLMsTxt
    url: llms/kimetsu-dev-agent-gateway-llms.txt
  - type: Arazzo
    url: arazzo/kimetsu-dev-discover-and-ask-workflow.yml
  - type: ErrorCatalog
    url: errors/kimetsu-dev-problem-types.yml
  - type: Authentication
    url: authentication/kimetsu-dev-authentication.yml
  - type: RateLimits
    url: rate-limits/kimetsu-dev-rate-limits.yml
  - type: DataModel
    url: data-model/kimetsu-dev-data-model.yml
  - type: JSONSchema
    url: json-schema/kimetsu-dev-agent-directory-v1.schema.json
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/kimetsu-dev-domain-security.yml
- type: AgenticAccess
  url: agentic-access/kimetsu-dev-agentic-access.yml
- type: Website
  url: https://kimetsu.dev/
- type: DeveloperPortal
  url: https://kimetsu.dev/docs/
- type: Documentation
  url: https://kimetsu.dev/docs/
- type: APIReference
  url: https://agents.kimetsu.dev/openapi.json
- type: GettingStarted
  url: https://kimetsu.dev/docs/install/
- type: Support
  url: https://github.com/RodCor/kimetsu/issues
- type: GitHubOrganization
  url: https://github.com/RodCor
- type: SourceCode
  url: https://github.com/RodCor/kimetsu
- type: ChangeLog
  url: https://kimetsu.dev/docs/changelog/
- type: ChangeLog
  name: Structured recent entries
  url: changelog/kimetsu-dev-changelog.yml
- type: License
  url: https://github.com/RodCor/kimetsu/blob/main/LICENSE-MIT
  name: MIT OR Apache-2.0 (LICENSE-MIT / LICENSE-APACHE)
- type: Security
  url: https://github.com/RodCor/kimetsu.dev/blob/main/SECURITY.md
  name: Security policy (private GitHub advisory reporting; agent gateway threat model)
- type: Robots
  url: https://kimetsu.dev/robots.txt
- type: LLMsTxt
  url: llms/kimetsu-dev-llms.txt
- type: LLMsTxt
  name: llms.txt (provider-hosted)
  url: https://kimetsu.dev/llms.txt
- type: WellKnown
  url: well-known/kimetsu-dev-well-known.yml
- type: JSONSchema
  name: well-known-agent-directory-v1 (/.well-known/kimetsu-agents.json)
  url: json-schema/kimetsu-dev-well-known-agent-directory-v1.schema.json
- type: AgentCard
  url: a2a/kimetsu-dev-a2a.yml
- type: MCPServer
  url: mcp/kimetsu-dev-mcp.yml
- type: ToolCrosswalk
  url: mcp/kimetsu-dev-tool-crosswalk.yml
- type: AgentSkill
  url: skills/_index.yml
- type: AgentSkill
  url: skills/kimetsu-dev-kimetsu-brain-SKILL.md
- type: AgentSkill
  url: skills/kimetsu-dev-discover-sidequest-commons.md
- type: Packages
  url: packages/kimetsu-dev-packages.yml
- type: SDKs
  url: packages/kimetsu-dev-packages.yml
  name: '@kimetsu-ai/sdk (TypeScript) and kimetsu (Python) clients for Kimetsu Remote'
- type: CLI
  url: cli/kimetsu-dev-cli.yml
- type: Conformance
  url: conformance/kimetsu-dev-conformance.yml
- type: ErrorCatalog
  url: errors/kimetsu-dev-problem-types.yml
- type: Lifecycle
  url: lifecycle/kimetsu-dev-lifecycle.yml
- type: Authentication
  url: authentication/kimetsu-dev-authentication.yml
- type: Conventions
  url: conventions/kimetsu-dev-conventions.yml
- type: DataModel
  url: data-model/kimetsu-dev-data-model.yml
- type: Overlay
  url: overlays/kimetsu-dev-agent-gateway-overlay.yaml
- type: Arazzo
  url: arazzo/kimetsu-dev-discover-and-ask-workflow.yml
- type: Plans
  url: plans/kimetsu-dev-plans-pricing.yml
- type: RateLimits
  url: rate-limits/kimetsu-dev-rate-limits.yml
- type: RegulatoryPosture
  url: regulatory/kimetsu-dev-regulatory-posture.yml
- type: VulnerabilityDisclosure
  url: security/kimetsu-dev-vulnerability-disclosure.yml
x-enrichment:
  date: '2026-09-19'
  status: enriched
  artifacts_added: 41
  pass: local-v3
x-a2a:
  verified: true
  probed: '2026-09-26'
  url: https://agents.kimetsu.dev/.well-known/agent-card.json
  grade: conformant
  protocol_version: 0.3.0
  control: 404

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