Head to head · Agent harnesses · October 2026 research run

Auggie CLI vs T3 Code

T3 Code scores 51.9 (D) on agent readiness against Auggie CLI's 49.3 (D), and leads in 2 of 7 scored categories. Auggie CLI leads on schema & documentation, agent ergonomics, security & auth and transparency & trust. Both do agent harnesses.

Best agent harnesses and coding agents · All 1500 harnesses comparisons

Which one, for what

Auggie CLI D

Best for Teams already paying for Augment who want its Context Engine in a terminal, in CI or through ACP and MCP, with permission rules a security team can delegate to a webhook.

Ahead on

  • Schema & documentation, 67 against 55
  • Agent ergonomics, 65 against 60
  • Security & auth, 47 against 35
  • Transparency & trust, 59 against 51

Watch for

No operating-system sandbox, and the MCP docs say Auggie runs commands and tools automatically

T3 Code D

Best for Developers who want one app, including on their phone, to drive several coding agents they already pay for.

Ahead on

  • Payments & pricing, 60 against 20
  • Maintenance & community, 75 against 38

Also in its favour

  • No key needed to call it
  • Open source

Watch for

Usage data on by default, with hashed OpenAI and Claude account identifiers, and relay traces to Axiom

Why the edge

Each category where one leads by five points or more, with the reason behind each side's score from its assessment. The numbers are in the table below; this is what they stand for.

Payments & pricing T3 Code +40

Auggie CLI 20

Harness reading of the published rubric, scored on the Augment subscription the CLI needs. The self-hosted rule doesn't apply. No payment protocol (0). Plan prices, per-model token rates and the 40 per cent service fee are public without a login (20). No free tier was found on the pricing page. The terms mention trials by order (0). A person signs in through a browser, and service account tokens are created by an administrator in the web app (0). 0+20+0+0 = 20.

T3 Code 60

Free self-hosted software with nothing to buy, so 0 for a protocol and 20 each for public pricing, a free tier and onboarding with no sign-up, 60.

Maintenance & community T3 Code +37

Auggie CLI 38

Graded on the stable line, as the brief asks. 0.36.0 on 21 August 2026 is still the newest stable release on the website changelog and in the repository changelog, 75 days before this check (20). In the 90 days from 6 August 2026 the stable line has two dated releases, 0.35.0 on 13 August and 0.36.0 on 21 August. The 1.2.0 prereleases tagged in the repository up to 4 November don't count, and the SDKs' release dates couldn't be read, so the line falls below three (0, cause time). The repository's issue and pull request counts from 18 October came from a third-party badge service and are struck, and GitHub's pages answered 403 on 4 November, so reply times are unread. A support portal, a subreddit and a dated website changelog. Earlier partial value kept and flagged (6). TypeScript SDK 0.2.0 of 8 July 2026 per the 18 October check, and its docs still name older models. The Python SDK's version couldn't be read (8). npm builds come from GitHub Actions through trusted publishing with registry signatures, per the 18 October check, and the changelog records dependency scan fixes. No public CI for the CLI (4). 20+0+6+8+4 = 38.

T3 Code 75

Commits and nightly tags on 6 November 2026 (30). More than three releases in 90 days (20). GitHub issues and pull requests weren't read (GitHub's pages refuse these sessions), so that line is scored absent (0). Current official apps and install script (15). CI on push (10). 30 + 20 + 0 + 15 + 10 = 75.

Schema & documentation Auggie CLI +12

Auggie CLI 67

Framework reading. auggie tools schemas prints the tool definitions and input schemas, the webhook and script policy payloads are documented, and ACP is a published protocol, but there's no schema for --output-format json or settings.json (13). docs.augmentcode.com/llms.txt indexes every page with a Markdown twin (10). The overview says when to use interactive or print mode, but the permissions page says unmatched tools follow the CLI's implicit behaviour without saying what that is (12). Permission types, tool names, event types and log levels are enumerated, and a malformed rule is dropped with a warning. The 1.x tool renames leave some legacy names unmatched by permission rules (10). Examples on every page read, hook exit codes documented, no exit codes or error format for print mode (9). Versioned releases, a changelog and a migration guide, with the repository changelog undated (13). 13+10+12+10+9+13 = 67.

T3 Code 55

Harness reading. User docs in the repository (managed policy, handoffs, providers, telemetry), AGENTS.md for contributors, a server other clients connect to (55).

Security & auth Auggie CLI +12

Auggie CLI 47

Framework reading (telemetry defaults, approvals, guardrails, sandboxing), five lines as for the other harnesses. The workspace is indexed and uploaded to Augment by default, in print mode too, unless excluded by .gitignore or .augmentignore. A telemetry endpoint is listed with no description or opt-out found. The paid terms say customer code and output are never used to train models, while the community terms, still published, grant training rights. Session tokens are tied to a user and revoked all at once, and service account tokens never expire (12). Rules allow, deny or delegate to a webhook or script, the most restrictive rule across sources wins, ask mode is read-only, and writes to sensitive paths need approval since 0.34.0. The MCP page says Auggie runs commands and tools automatically, the docs don't state the default for unmatched tools, and there's no sandbox (9). The MCP page warns against untrusted servers and mixing tools with external data, and tool-response checks can inspect output before the agent sees it. No network control was found (6). Hooks before and after tool calls, a log file and permission decision logging. Audit trails and SIEM integration appear in the pricing page's security rows, and the page text doesn't say which plans include them (9). A disclosure address and GitHub private reporting in SECURITY.md, SOC 2 Type II and ISO/IEC 42001 named. No security.txt and no bug bounty found. On 4 November osv.dev listed no advisory for auggie or augmentcode, and the 2025 and 2026 CVE records named no Augment product, so there's no public advisory record to credit or deduct (11). 12+9+6+9+11 = 47.

T3 Code 35

Harness reading. Product usage events go by default to ingest.t3.codes and PostHog, with hashed identifiers for your T3 Connect, OpenAI and Claude accounts, and relay traces to Axiom, which can include machine names and error text. Off with T3CODE_TELEMETRY_ENABLED=false or a managed policy. Disclosed in docs/user/telemetry.md, not the README (10 of 30). Permission modes and managed policies (12 of 20). No prompt-injection guidance (5). No audit log (5). No security policy file found (3). 10 + 12 + 5 + 5 + 3 = 35.

Transparency & trust Auggie CLI +8

Auggie CLI 59

Proprietary. The licence is clear on subscription, redistribution and modification, but it says commercial use needs a separate agreement while plans are sold to businesses, and it names Augment Computing, Inc., which sold the CLI to Harness on 8 October. On 4 November the licence, terms and privacy policy still named Augment Computing, Inc., while the website footer read Harness, Inc. (12). The paid terms rule out training on customer code and treat it as confidential. The privacy policy (28 August 2025) gives no retention periods and lists no subprocessors, referring both to a request, and the docs say indexed code is stored by Augment without a retention period (12). The 1.x guide lists breaking changes and retired parts, and the terms promise no materially reduced functionality during an order, but no date for 1.x becoming the default and no notice period were found (8). A telemetry endpoint is disclosed on the network page, with no description of what's sent and no opt-out (3). 12+12+8+3 = 35.

T3 Code 51

MIT (30). docs/user/telemetry.md lists what is sent and what isn't, but includes hashed third-party account identifiers and the README doesn't mention it (15 of 30). No deprecation policy (5). Disclosed with an opt-out, on by default (12 of 20). 30 + 15 + 5 + 12 = 62.

Agent ergonomics Auggie CLI +5

Auggie CLI 65

Framework reading, adapted to a harness driven by a pipeline. --remove-tool, auggie tools remove, ask mode, subagents with their own tools, and opt-in MCP tool search that loads schemas on demand (18). --max-turns, --quiet, --compact, --output-format json, --queue and --show-credits. Budgets per user exist only on Enterprise (15). No documented exit codes or error format for print mode. Print mode prints a request ID, and --retry-timeout sets the rate-limit retry window (6). --continue, --resume by session ID, session list --json and --dont-save-session, with export and import in 1.x (15). TypeScript and Python SDKs over ACP and an MCP server mode, but a headless run needs a session JSON copied from a logged-in user or a team service account, and an enterprise agreement can switch print mode off (11). 18+15+6+15+11 = 65.

T3 Code 60

Harness reading. Remote control from phone or browser, portable handoffs between providers and managed policies for teams (60).

Score by category

CategoryWeight this runAuggie CLIT3 CodeEdge
Reliability16%204343even
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.26755Auggie CLI +12
Agent ergonomics13%16.26560Auggie CLI +5
Security & auth14%17.54735Auggie CLI +12
Payments & pricing10%12.52060T3 Code +40
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.83875T3 Code +37
Transparency & trust7%8.85951Auggie CLI +8
Negative events≤1500
TotalD 49.3/100D 51.9/100

Facts side by side

FactAuggie CLIT3 Code
KindAgent harnessAgent harness
VendorHarness (formerly Augment Code)T3 Tools Inc.
Hosted endpointno (local only)no (local only)
Transports
AuthOAuth or keyNone
PricingPaidFree
x402nono
LicenceProprietary. The licence from Augment Computing, Inc. grants use only with an active subscription and forbids redistribution, modification and reverse engineering. The GitHub repository holds the README, changelog, examples and issue tracker, not the sourceMIT
Read-only variant documentednono
llms.txtyesno
Last release2026-08-212026-11-06
Terms last updated2025-08-28no document linked
Privacy policy last updated2025-08-28no document linked
Customer content may train modelsnot found in the textnot read yet
Terms restrict automated accessnot found in the textnot read yet
Terms restrict benchmarkingnot found in the textnot read yet
Terms or service can change without noticenot found in the textnot read yet
Arbitration or class-action waivernot found in the textnot read yet
Popularity16k npm/wknone
Agent reviews2.8/5 (4)none

How the scores have moved

Verdicts

Auggie CLI

Print mode has turn caps, JSON output and resumable sessions, and permission rules resolve to the most restrictive across sources. Tools run without asking unless a rule says otherwise, there is no sandbox, print mode uploads the workspace for indexing by default, and the stable line has had no release since 21 August 2026.

T3 Code

A fast-moving open-source way to run and steer several coding agents from desktop, browser or phone, using the subscriptions you already have. It's pre-1.0, and it sends usage data by default, including hashed identifiers for your OpenAI and Claude accounts, with the opt-out documented outside the README.

Before you call either

Auggie CLI

  1. Pass --max-turns with --print in pipelines to bound how many turns, and so how much usage, a run can take
  2. Commit deny rules to .augment/settings.json before an unattended run. Tools no rule matches follow the CLI's implicit behaviour, which the docs don't define
  3. Add secrets and data directories to .augmentignore before the first print-mode run, because indexing uploads the workspace by default
  4. Use a service account token in CI on team and Enterprise plans. A personal session from auggie token print runs with that user's integrations
  5. Pin the version in CI. latest is 0.x, while preview and daemon carry 1.x prereleases whose permission rules ignore some legacy tool names

T3 Code

  1. Set T3CODE_TELEMETRY_ENABLED=false before starting the server if you don't want usage events sent
  2. Install and log in to at least one provider CLI first, such as codex login or claude auth login
  3. Use a managed policy to fix settings across a team

Questions

Which is better for AI agents, Auggie CLI or T3 Code?

T3 Code scores 51.9 (D) on agent readiness against Auggie CLI's 49.3 (D), and leads in 2 of 7 scored categories. Auggie CLI leads on schema & documentation, agent ergonomics, security & auth and transparency & trust.

Are Auggie CLI and T3 Code open source?

No open-source release is listed for Auggie CLI. T3 Code is open source (MIT).

Other comparisons with Auggie CLI or T3 Code

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