evo-agents

Shared tooling for agent harnesses: a cluster of repos plus the manifest, plans and documents that tell a coding agent how the cluster fits together.

The first piece is a multi-source knowledge graph. Connectors read git repos, the harness itself, wikis and project CLIs, speak one JSON Lines protocol (kg/1), and feed an append-only log per project. A deterministic pipeline turns that log into a SQLite graph that agents query over MCP. Every node and edge carries provenance and a sensitivity label, and a session only sees what its clearance allows.

Status: early prototype. Interfaces will change.

Install

uv tool install 'evo-ak[graphify]'   # or: pip install 'evo-ak[graphify]' (PyPI name; the command is evo-agents)
uv tool install 'evo-ak[graphify] @ git+https://github.com/maycuatroi1/evo-agents'   # unreleased main
# or, from a checkout: python -m pip install -e '.[test,graphify]'

The core needs Python 3.10+ and PyYAML; nothing else. The graphify extra adds graphify's tree-sitter extractors, which give code symbols for about 40 languages; without it only Python files get symbols, and kg build and kg status warn with the number of code files left without them. A source that sets code: {backend: graphify-ast} fails the build instead when the extra is missing.

Quick start

A harness opts in with a knowledge.yaml next to its harness.yaml:

version: 1
project: demo
policy:
  levels: [public, internal, customer, secret]
  sinks:
    - id: claude-code@anthropic
      kind: agent-session
      clearance: {level: internal}
sources:
  - id: harness            # plans, contracts, bindings, docs of the harness itself
    connector: harness
    label: {level: internal, integrity: U}
  - id: app                # a repo declared in harness.yaml
    connector: git
    repo: app
    refresh: 1h            # due for kg sync --due once an hour
    label: {level: internal, integrity: U}
  - id: wiki               # any command that speaks kg/1
    connector: exec
    command: [my-cli, kg-connector, wiki]
    credentials: [{key: my.wiki.token, env: WIKI_TOKEN}]
    label: {level: customer, integrity: U}
identifiers:
  - kind: UseCase
    pattern: '\bKB-\d{2}\b'

A markdown file whose frontmatter id: matches an identifier pattern is where that code is defined; a copy says derived_from: in its frontmatter, and kg status lists codes defined in more than one place.

Then, from the harness:

evo-agents harness validate          # schema and reference checks for every harness file
evo-agents kg sync --build           # run connectors, build the graph
evo-agents kg status                 # freshness, coverage and held deletions per source
evo-agents kg build --verify         # rebuild from scratch and compare hashes
evo-agents kg query kg_search "KB-01"
evo-agents kg query kg_impact --arg 'paths=["app:src/search.py"]'

Corpus and graph live in ~/.evo/kg/<project>/ (override with EVO_KG_HOME), never in a repo. Every source sync and every build appends one line to audit.jsonl there: ids, times, counts and versions, never item content.

To keep graphs fresh, give sources a refresh interval (30m, 6h, 1d). kg sync --due runs only the sources whose interval has passed since their last ok run; --all does that for every project that has synced on this machine. On macOS, kg schedule install loads a LaunchAgent that runs kg sync --due --all --build every hour (kg schedule print shows the plist, kg schedule uninstall removes it; output goes to ~/.evo/kg/schedule.log).

Using it from Claude Code

claude plugin marketplace add https://github.com/maycuatroi1/evo-agents
claude plugin install evo-kg@evo-agents

The plugin registers the MCP server evo-kg, a using-project-graph skill, and three hooks. The server binds to the project of the session directory; pass --project in .mcp.json to pin one, or run evo-agents kg bind --project NAME DIR once to tie a directory and everything below it to a project (kg bind --list and kg bind --remove DIR manage those bindings).

Hooks:

• SessionStart prints a short note: the bound project and the snapshot age.
• PostToolUse, after every evo-kg call, joins the labels of what the result revealed into a session label under ~/.evo/kg/sessions/. It only rises; kg_status shows it.
• PreToolUse, before Grep, Glob, or rg or grep in Bash, may add a note with the ids of graph nodes named like the search. It never allows or blocks the call. Set EVO_KG_GREP_HINTS=0 to turn it off.

The plugin needs uv on PATH and pins the release it runs: the server starts with uvx --from evo-ak==0.1.1 evo-agents, which downloads and caches that version on first start. The hooks run uvx --offline --from evo-ak==0.1.1 evo-agents, so they never wait on the network; they stay silent when uvx is missing or until the server has cached the package.

Writing a connector

A connector is a generator in process or any executable. It writes JSON objects, one per line: hello first, then item, tombstone, listing, state, error, log, and closed last. Item IDs are <source>:<kind>:<native key>; every item carries a revision and a content hash over canonical JSON. Deletions are only inferred from a scoped listing that ends with complete: true, so a connector that dies half-way never deletes anything.

evo-agents kg connector test -- my-cli kg-connector wiki --fixture tests/fixtures/wiki

checks protocol, determinism, replay and permutation, truncated listings, golden output and labels.

Layout

evo_agents/
  harness/    schema and loader for harness.yaml, knowledge.yaml, contracts.yaml, plans
  kg/         protocol, connectors, corpus, pipeline, store, policy, MCP server
plugins/      Claude Code marketplace (plugin evo-kg)

License

Apache-2.0. See LICENSE.