wcode

A minimal, pi-like coding agent for the terminal. It streams an LLM conversation and gives it content-addressed tools — read (anchors per line), grep/find, bash, edit/edits/replace, write, and ast-grep search/rewrite — and stays out of the way. Built on a small kernel (wcode-harness) that speaks to any OpenAI-compatible chat-completions endpoint.

Install

Install with Homebrew — a tap by URL, no extra repo:

brew tap WeiNyn/wcode https://github.com/WeiNyn/wcode
brew install wcode

From crates.io (a Rust toolchain is required):

cargo install wcode-cli

Or grab a prebuilt binary — Linux (x86_64, aarch64) and macOS (Intel, Apple Silicon) tarballs are attached to each release. Build the latest from source with cargo install --path crates/wcode-cli.

More at weinyn.github.io/wcode.

Configure

~/.config/wcode/config.toml:

model = "gpt-4.1"      # required
base_url = "https://api.openai.com/v1"  # optional; any OpenAI-compatible endpoint
api_key = "sk-..."     # optional
endpoint = "chat"      # optional; chat|responses, default chat
effort = "high"        # optional; free-style reasoning effort, omitted = not sent

# Per-model providers: when a model id is selected (mid-session `/model`, a
# worker's `spec.model`, or `--model`), this entry's endpoint/base_url/api_key
# re-point the provider. Absent fields inherit the globals above. Quote ids that
# contain dots or slashes.
[models."gpt-5.1"]
endpoint = "responses"
base_url = "https://api.openai.com/v1"
api_key = "sk-..."

[hooks]
rtk = "auto"           # optional; auto|true|false — route bash output through the
                       # rtk proxy (https://github.com/rtk-ai/rtk) to cut tokens
                       # (default auto = on only if the rtk binary is on PATH)

[tools]
grep = true            # optional; true|false — register the grep tool (off by default)
find = true            # optional; true|false — register the find tool (off by default)
parallel = true        # optional; true|false — run independent tool calls from one batch
                       # concurrently (default true; --sequential forces it off)

[compaction]
# Compact the conversation as it grows. An absent table = harness defaults.
budget = 100000            # optional; working token ceiling to compact near
                           # (default: the model's context window)
window = 200000            # optional; context-window override for unknown models
min_remaining = 16384      # compact once fewer than this many tokens remain
keep_recent_tokens = 20000 # recent verbatim context kept after compacting, in tokens
keep_recent_turns = 2      # complete turns always kept, whatever their size

[instructions]
# Instruction ("reference") files folded into the system prompt. An absent table
# = discover the candidate names from the working dir up to the repo root, plus
# a global file in the config dir, merged global-first. `file` overrides
# discovery with a single name/path; "off" disables.
file = "AGENTS.md"          # optional; load exactly this instead of discovery
names = ["AGENTS.md"]       # optional; candidate names per directory
                            # (default: AGENTS.override.md, AGENTS.md, CLAUDE.md)
global = true               # optional; also load one from ~/.config/wcode

[skills]
# Discover `SKILL.md` packages and fold their name + description into the system
# prompt; the body loads on demand when the agent `read`s the path. An absent
# table = discover from the standard roots.
enabled = true              # optional; discover skills at all. Default true
dirs = ["./team-skills"]    # optional; extra roots, scanned first
disabled = ["noisy-skill"] # optional; names to skip

[retry]
# Retry the connect/handshake (and the first streamed item) on transient
# failures — 429/5xx statuses and transport errors. An absent table = defaults.
max = 3                    # optional; retries after the first attempt (0 disables)
base_ms = 500              # optional; base backoff for the first retry
cap_ms = 8000              # optional; cap on a single backoff wait
ttft_ms = 60000            # optional; time-to-first-token timeout (0 disables)
idle_ms = 120000           # optional; inter-item idle timeout (0 disables)

[theme]
# TUI theme, presentation-only. `name` selects a built-in preset —
# default | dark | light | gruvbox-dark | nord | solarized-dark | solarized-light.
# `default` is named-16 (safe on any terminal); the others are truecolor, so they
# are a no-op on a non-truecolor terminal (a `light` preset also needs a light
# terminal). A role value is a named ANSI color (`cyan`, `light-yellow`,
# `dark-gray`, ...) or hex `#rrggbb`; absent roles inherit the palette. Roles:
# accent, dim, muted, border, user, body, error, success, warn, code, heading,
# heading_sub, link, tool_name, thinking, diff_add, diff_del. Hex is honored only
# under truecolor; NO_COLOR wins over everything. Select a preset live with the
# TUI's `/theme [name]` (bare `/theme` opens a picker) or start with `--theme <name>`;
# `--list-themes` prints the catalog. Explicit role keys survive a preset switch.
name = "gruvbox-dark"      # optional; a catalog preset (default: palette B)
link = "light-cyan"        # optional; role = color (overrides the preset)
muted = "#5f5f5f"          # optional; hex is truecolor (opt-in)

# A preset team the orchestrator starts with (a non-empty [team] auto-enables
# agents — no --agents needed). One [[team]]
# entry per member; names are unique (a duplicate fails the load loudly). Keys:
#   name      (required) the member's address, unique
#   role      extra system-prompt text (`# Role`) appended to the worker blurb
#   model     model id override (default: the orchestrator's)
#   tools     tool allow-list (`message` is always kept; unknown names rejected)
#   read_only enforce read-only: refuse the mutating tools and mutating bash/bg
#   effort    reasoning-effort override (`-`/`none`/`off` clears; default: inherit)
#   base_url  provider base URL override (default: the orchestrator's)
#   api_key   provider API key override (default: the orchestrator's)
[[team]]
name      = "explorer"
role      = "recon only; never edit; cite file:line"
tools     = ["read", "grep", "find"]
read_only = true

[[team]]
name   = "reviewer"
role   = "verify diffs; PASS / NITS / FAIL"
effort = "high"

[workflow] — a plan template (requires --agents)

A single [workflow] table seeds the task DAG at boot. Each [[workflow.node]] becomes a node, instantiated in topological order (so a depends_on may name a later-authored sibling):

[workflow]
max_attempts = 3            # optional; the rework cap (default 3)

[[workflow.node]]
id = "explore"              # required; a unique label
member = "explorer"         # EXACTLY ONE of member | script
title = "Explore: {{task}}" # optional label; {{task}} is the run's task

[[workflow.node]]
id = "implement"
member = "builder"
depends_on = ["explore"]    # sibling ids; resolved to Task ids at boot

[[workflow.node]]
id = "verify"
depends_on = ["implement"]
gate = true
script = "cargo test --workspace"   # a physical gate (exit code = verdict)

A node is a member (a [team] name) OR a script (sh -c, run under the bash automation policy); gate = true makes its reject re-open its deps, and a gate needs at least one depends_on. The graph is validated acyclic at load. The plan shows in the TUI's /tasks listing as #id [state] title (owner) ← #deps ×attempts.

A node may carry an optional title (its label, dispatched to the worker as #<id> <title>; absent → the node id). The one placeholder recognized in a title is {{task}} — substituted with the run's task; any other brace form is left literal, and scripts are not templated.

Passing --task <text> (or the WCODE_TASK env) turns a [workflow] run headless (no TUI): wcode seeds the root with the task, drives the plan to a terminal state, and exits — 0 once every node is Done, 1 if any node is Failed, if the --timeout <secs> wall-clock cap elapses (0/absent = no cap), or if the root's first turn errors (the cap starts after that turn). --task requires [workflow] and --agents, and cannot be combined with -p; a {{task}} template without a task is a boot error. -p is unaffected (it stays a single root turn), and a pure [team] (no [workflow]) remains the interactive, per-task path.

[orchestrator]
# Root-only workflow guidance (requires --agents), folded into the system prompt
# as a `# Orchestrator workflow` section after the team roster.
guidelines = """
Step 1: message a member by name; Step 2: verify their result.
"""

[peers]
# Persistent phonebook entries for `message`'s `to` (requires --agents). A value
# containing `:` is an address alias (`agent:<id>`); otherwise it is a socket
# path, connected lazily (Unix only).
explorer = "/tmp/wcode/explorer.sock"
helper   = "agent:w7"

Environment variables beat the toml: WCODE_BASE_URL, WCODE_API_KEY, and OPENAI_API_KEY as a key fallback, plus WCODE_ENDPOINT, WCODE_EFFORT, WCODE_RTK and WCODE_GREP/WCODE_FIND (which override tools.grep/tools.find), and WCODE_COMPACT_BUDGET, WCODE_COMPACT_WINDOW, WCODE_COMPACT_MIN_REMAINING, WCODE_COMPACT_KEEP_RECENT_TOKENS, WCODE_COMPACT_KEEP_RECENT_TURNS, and WCODE_INSTRUCTIONS (a file name/path, or off), WCODE_SKILLS (extra skill roots, or off), WCODE_TASK (a [workflow] run's task when --task is absent), and WCODE_RETRY_MAX, WCODE_RETRY_BASE_MS, WCODE_RETRY_CAP_MS, WCODE_RETRY_TTFT_MS, WCODE_RETRY_IDLE_MS (the [retry] table).

Provider precedence is [models.<id>] > flags/env/config: the toml globals, WCODE_*, and --base-url/--endpoint together set the default provider; a [models.<id>] entry for the selected model overrides the endpoint/base_url/api_key fields it names (an unmapped model — or a field the entry omits — uses the default).

--config <path> (or WCODE_CONFIG; flag beats env, relative to the cwd) points at an overlay file deep-merged over the global config: tables merge per key, so an overlay's [tools] grep = true adds that flag without clobbering the rest of the global [tools], while a scalar or array is replaced wholesale. This keeps team/model overlays (per repo, per project) out of the provider config. The explicit overlay layers on top of the auto-discovered project overlays (see below); a missing or unparseable overlay is an error.

--model / --base-url / --endpoint / --effort / --config override a successfully loaded config (and --model rescues a missing model), but cannot rescue an unreadable or invalid config.toml — that still exits with an error. --effort - (or none/off) clears back to send-nothing. When --model selects an id, its [models.<id>] entry overrides the default provider for the fields it names, and switching back to an unmapped model restores the default provider (a model switch is reversible).

--no-instructions skips the instruction files; --dump-system-prompt prints the composed system prompt (instructions included) and exits — no model needed.

With --agents and a [team], wcode spawns each member at startup and the root's system prompt gains a # Your team block listing them by name (and role); members are addressed by name with message. The root also gets member: op = "status" peeks a member's last completed work (no model call), op = "ask" puts a tool-free question to the member's own model, and op = "cancel" stops its in-flight run — all three work while the member is mid-run (a read comes from its last turn boundary, a cancel takes effect without waiting for the run to end). A non-empty [team] auto-enables agents mode — no --agents needed — and a served --owner worker never sees the block. An [orchestrator] guidelines string is appended as a # Orchestrator workflow section after the team roster, so the workflow can reference the team.

Project config is auto-discovered from the working dir: ./.wcode/config.toml then ./.wcode/team.toml (team wins where they overlap), folded over the global config, with an explicit --config/WCODE_CONFIG overlay still layered on top. Agent definitions can also be authored as markdown under ./.wcode/agents/**/*.md — YAML frontmatter (name, model, effort, tools, read_only, base_url, api_key) plus a body that becomes the member's role — folded under the TOML [team] (a TOML member of the same name wins). --no-project-config (or WCODE_PROJECT_CONFIG=off) disables all of it. The repo ships .wcode/team.toml as exactly this — the dev team, the orchestrator workflow, and [tools] grep/find = true, leaving your provider/model in the global config — so here wcode (or wcode --agents) starts the full team with no flags.

Keyless local OpenAI-compatible endpoints (Ollama, llama.cpp, vLLM, ... over localhost / 127.0.0.1 / [::1]) work without a key — wcode sends a placeholder bearer token so --base-url http://localhost:11434/v1 just works.

Use

wcode                        # REPL
wcode -p "explain this repo" # one-shot: run, print reply, exit
wcode --agents --task "fix bug 123" --timeout 600   # headless [workflow] run
wcode --resume               # continue the latest session
wcode --no-session --model m --base-url http://localhost:11434/v1
wcode --list-models          # print GET {base_url}/models ids, exit
wcode --list-themes          # print the built-in theme names, exit
wcode --theme nord           # select a theme preset (or `[theme] name` in config)
wcode --no-instructions      # run without loading instruction files
wcode --dump-system-prompt   # print the composed system prompt, exit
wcode --no-skills            # run without discovering skills
wcode --sequential           # run each tool call one at a time
wcode --tui                  # force the full-screen TUI (default on a TTY)
wcode --no-tui               # force the line REPL (pipes/CI)

The interactive path: with no -p, wcode starts a full-screen TUI when stdin and stdout are a terminal, and the line REPL otherwise. --tui/--no-tui force either; -p, serve, and piped input always take the non-TUI path. The TUI renders the same AgentEvent stream, over a local session or a --socket one.

TUI keys: Enter submit · Shift-Enter/Ctrl-J newline · Up/Down recall prompts · PgUp/PgDn (or the wheel) scroll · Esc/Ctrl-C cancel a run or quit · Ctrl-Y copy the last reply (OSC-52) · Ctrl-T expand/collapse every tool's output · Ctrl-N/Shift-Tab (or Alt-1..9) switch surface · Ctrl-B toggle the sidebar · Ctrl-A/E/W/U/K readline-style input editing. Ctrl-G enters browse mode, a ▌ cursor over the transcript (j/k next/ prev, g/G first/last, Enter expand/collapse the selected block, y copy it, Esc/q/Ctrl-G leave). F1 (or /help) opens the full keymap. The input box wraps and grows (capped at 8 rows, or half the screen, then scrolls to the cursor); a paste over 100 chars or more than 3 lines collapses to a ❰ pasted … ❱ chip; the full text is sent (outer whitespace trimmed). TUI /-commands: /exit, /model <id>, /effort [level], /theme [name] (bare /theme opens a picker), /compact [text], /usage, /copy, /team, /surface, /help — the subset that maps to a Request under the current session — plus /changes (list the files this run changed, re-showing a diff), /resume (pick a session; the CLI re-execs into it), /new (alias /clear; start a fresh session — a new group for a team — by re-exec'ing with no --resume; refused over a socket), and [--no-session](rebuild + re-exec into the current session, mirroring the REPL; refused over a socket). The remaining session-lifecycle commands below stay in the REPL.--agentsand a team, each member runs as its own **surface** (the root, plus one per member): input and/-commands go to the **focused** surface — switch with /surface(a picker),Ctrl-N/Shift-Tab(cycle), orAlt-1..9 — and a right-hand sidebar lists the members (label · model · state, idle/running/done, the focused one bolded; shown at ≥ 60 columns, Ctrl-Btoggles it)./team` prints the roster.

REPL commands (unknown /... lines go to the LLM as prompt text):

Effort fans out per endpoint: Chat sends reasoning_effort, Responses sends reasoning: { effort }, unset sends nothing. Model listing only returns id metadata — no capability flags — so effort support stays user-managed.

Ctrl-C aborts the run in flight and stays in the REPL; when idle it exits. Output: text streams to stdout, thinking and tool output are dimmed (⚙ name ✓ first-line-of-output), errors to stderr.

Tools

edit/replace/write share a mutation lock and write via a temp file + rename, so concurrent file mutation can't interleave or truncate.

When the model issues several tool calls in one message, the independent ones run concurrently — read/grep/find/ast_search/webfetch are read-only and opt in; mutating tools and bash are barriers, so no read can race a write inside a batch. Results are still appended in call order. --sequential (or [tools] parallel = false) restores strictly one-at-a-time execution.

Design: content-addressed editing

Line numbers are positional — insert one line and every number below silently means something else, the classic way agents corrupt files. wcode read/edit address lines by a 5-char content anchor instead (XXa1b│fn main() {), following the hashline ideas in pi-better-edit:

• anchor(line) is a pure hash of the line's raw content (a trailing \r is dropped for CRLF/LF portability). Inserting or deleting lines elsewhere never changes an intact line's anchor; whitespace is part of the address, so {, { and \t{ are distinct (a nested brace is directly addressable), and foo bar ≠ foobar. Cost: a formatter that reindents moves indented lines' anchors — re-read before editing after a format.
• edit sends from/to anchors + the new text — old code is never re-typed (token savings) and the target can't drift.
• Identical lines intentionally share an anchor; edit rejects ambiguous targets with the candidate line numbers (or old_string to pin one) instead of guessing. Stale anchors (line changed since read) get the same reject-with-a-hint treatment.
• Fully stateless: no anchor store, no session memory, so external edits (bash, formatters, other tools) are always picked up — read/edit recompute anchors from current file contents every call.

Structural search is a separate axis: ast_search/ast_edit shell out to an ast-grep binary (the legacy sg alias is the fallback; the same auto-detect pattern as the rtk hook).

Skills

A skill is a directory with a SKILL.md — YAML frontmatter (name, description) plus a body:

---
name: pdf-tools
description: Extract text and tables from PDFs. Use for PDF documents.
---

# PDF tools
Run `scripts/extract.sh <file>`.

Only name and description enter the system prompt (as an # Available skills section); the body loads on demand — the agent reads the SKILL.md when a task matches. That is progressive disclosure: many skills cost many one-line entries, not many bodies. A skill may ship scripts/, references/, assets/; the body refers to them by relative path.

Roots, highest priority first (first name wins):

1. [skills] dirs / WCODE_SKILLS explicit roots,
2. the working dir and its ancestors up to the repo root — .wcode/skills/, then the shared dir .agents/skills/ (falling back to .claude/skills/ where .agents is absent),
3. global — ~/.local/share/wcode/skills/, then the same shared pair.

Malformed skills (bad name, missing description, invalid YAML) warn on stderr and are skipped. --no-skills disables discovery.

Sessions

JSONL files in ~/.local/share/wcode/sessions, named <millis>_<id>.jsonl (~/.local/share is used even on macOS, matching the config convention). One entry per message plus model_change / effort_change markers; torn final lines are tolerated. /resume replays the history as the conversation context and restores the last model + effort (--model / --effort flags win when passed alongside --resume).

On a clean interactive exit (/exit, or EOF; the TUI's /exit) wcode prints the exact command to bring the session back, e.g. resume: wcode --resume <sessions>/<id>/root.jsonl --model <id> --agents for a team — copy-paste it to relaunch. A remote (--socket) session prints nothing.

Philosophy

pi-like, deliberately small. One kernel — event loop, tool dispatch, hooks, JSONL sessions — and a thin CLI on top. The kernel crate (wcode-harness) is about 10k lines and the whole workspace about 52k, a fraction of a batteries-included agent. Absent by design: MCP, subagents, permission prompts, approval flows, config files for behavior. That logic belongs in code, via Hooks: block or rewrite tool calls (before_tool_call), transform context per turn, force stops. Build the variant you want instead of configuring one.

Extending

• Tools — implement TypedTool (typed args + schema via schemars), wrap with erased(), add to default_tools().
• Policies — implement Hooks (before_tool_call returning a reason blocks execution and feeds the reason back to the LLM as an error).
• Providers — implement StreamFn: context + system prompt + tool defs in, stream of LlmStreamEvent out. rig_stream_fn() is the built-in OpenAI-compatible adapter.

License

MIT © 2026 Wei