Open-source agent harness

You run an agent
inside Elpis.
It becomes Elpis.

The open-source home for coding agents—context, continuity, tools, evidence, and deterministic work in one place.

Watch the demo ↓Install Elpis

Context ledgerLean continuityProvider choiceDeterministic work graphs

One terminal turn

See the harness
at work.

Scroll to play. Reverse midway to rewind; after the final frame, scrolling up closes the demo.

masih@atlas ~/Desktop/p/Elpis

❯ █

████████████   ██            ███████████     ████    ████████████
████████████   ██            ████████████    ████    ████████████
██             ██            ██        ███   ████    ██
██             ██            ██        ███   ████    ██
██████████     ██            ████████████    ████    ████████████
██             ██            ███████████     ████              ██
██             ██            ██              ████              ██
████████████   ███████████   ██              ████    ████████████
████████████   ███████████   ██              ████    ████████████

Elpis is starting · preparing session

◆ELPIS~/Desktop/p/Elpisgpt-5.6· local

›

◆

● Reading product truth before touching code.

└

›read docs/GUIDE.md docs/context.md docs/sessions.md✓

›inspect documented Ace pruning example231 lines

◆ Ace · pre-admission

readme.md:117 Completed tool evidence before admission: 231 lines, 18,930 characters.

docs/context.md:14 RTK filtering → deterministic cap → optional Ace pruning.

docs/context.md:26 Native compaction remains an independent process.

docs/sessions.md:6 GOAL.md, ES.md, and applicable rules form lean continuity.

[Ace · same result · 248 characters retained]
Relevant conclusion retained; exact tool-call envelope and immutable audit remain available.
Documented example: 18,930 → 248 characters · readme.md:117–142

◆

I’m oriented. Elpis admits explicit continuity sources, keeps provider history authoritative for exact resume, and records pruning evidence without changing already-sent history.

elpising…0s · esc to interrupt

█

Enter send · Shift+Enter newline↵

Tab focus · Alt+C focus/hide · Ctrl+click open file

/context

See what filled
the window.

A full, rendered history report—not JSON and not a source-toggle panel. This illustrated request is exactly 50% full; the headline is measured while category attribution is estimated.

› /context illustrated measured snapshot

Context Usage

gpt-5.6-terra · 129.2k / 258.4k tokens (50% used)

Token usage by category

User messages: 7.8k tokens (3.0%)

Agent responses: 45.6k tokens (17.6%)

Tool calls: 54.3k tokens (21.0%)

System prompt: 3.1k tokens (1.2%)

Development rules: 5.4k tokens (2.1%)

Other (overhead): 13.0k tokens (5.0%)

Free space: 129.2k (50% left)

Headline is measured; category sizes are attribution estimates.

Category Breakdown · retained ■ reclaimed ✦

User messages7.8kAgent responses45.6kTool calls54.3kOther categories21.5k

Ace Pruning Audit & Low-level Breakdown

documented example 231 lines · 18,930 characters reviewed

retained 248-character replacement · immutable before/after artifacts

prune_report.md · ace.json · manifest.json

Checkpoints · Esc Esc to backtrackAvailable after a user message; selecting one forks from that prior point.

Dashboard

The whole run.
One glance.

Timing, context, tokens, and backend cost from one recorded successful run.

Elpis · recorded run

Completed · revision 12

successful

Latest outcome

Completed

Elapsed · 930 ms

Backend cost

$1.25

reported total

First token

240 ms

3 sampling requests

Requests

1 retry · pruning off

Where 930 ms wenttool blocking dominated

Sampling 200Tools 500Other 230 ms

Recent activity
Outcome	Total tokens	TTFT	Cost
Completed	26.4k	240 ms	$1.25

Deterministic work graphs

Bounded work.
Visible evidence.

Play a task from assignment to review. Inspect what each agent receives, changes, and hands back.

Interactive example · work graphs are opt-in

Coordinator-owned tasks · dependency-ready dispatch · evidence checks

Open source

Install Elpis.
Run it locally.

Linux x86_64 preview. Inspect the source, then run the installer.

Installation and source ↗

curl -fsSL https://raw.githubusercontent.com/MasihMoafi/Elpis/main/scripts/install-elpis.sh | bash && ~/.local/bin/elpis

You run an agentinside Elpis.It becomes Elpis.

See the harnessat work.

See what filledthe window.