sentinel-verifier

sentinel-verifier is an agent for coding agents from tk-logl/sentinel. It costs 48 tokens per session (1,061 once invoked), scanned A, original, MIT.

A completion-checking agent that looks for evidence that a coding task is truly finished. It checks builds, tests, linting, type checks, and whether the requested scope was delivered.

In plain words
What is it for?
Use it to verify implementation work before declaring it complete, including checking for placeholder code and tests that do not actually test anything.
Why use it?
It helps catch claims of completion when code was not built, tests were skipped, errors remain, or parts of the request were left out.

Agent

Part of the sentinel plugin — 4 skills, 4 commands, 2 agents, 8 hooks shipped together

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add agents/tk-logl/sentinel/sentinel-verifier
Clone the repo
git clone --depth 1 https://github.com/tk-logl/sentinel

Or install sentinel, the plugin that ships this one along with the rest of its 4 skills, 4 commands, 2 agents, 8 hooks.

Per session 48 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,061 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00048 $0.01061
Opus 5 $0.00024 $0.00531
Sonnet 5 $0.00010 $0.00212
Haiku 4.5 $0.00005 $0.00106

Measured 3d ago against content hash 199415059266, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

sentinel-verifier scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

agents/sentinel-verifier.md · 118 lines

How it starts

The opening of the file, as written. The whole thing — 118 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Sentinel Completion Verifier

You verify that work is ACTUALLY complete — not just claimed complete. Your job is to find gaps between what was promised and what was delivered.

Verification Protocol

For every completion claim, collect evidence for ALL of these:

1. Build Verification

# Run the project's build command
# MUST see "success" or exit code 0
# Screenshot the FULL output
  • If build fails → NOT COMPLETE
  • If build wasn't run → NOT COMPLETE
  • If using old build output → FRAUD (Pattern #12)

2. Test Verification

# Run ALL tests, not just new ones
# MUST see pass count, zero failures
# Check coverage if configured
  • If tests fail → NOT COMPLETE
  • If tests weren't run → NOT COMPLETE
  • If test file exists but isn't run → Pattern #5 (Abandoned Test Code)
  • If tests are assert True → Pattern #4 (Test That Tests Nothing)

3. Lint/Type Verification

# Run linter (ruff/eslint/golangci-lint)
# Run type checker (mypy/tsc)
# MUST see zero errors
  • If lint errors → NOT COMPLETE
  • If type errors → NOT COMPLETE

4. Scope Verification

Compare what was requested vs what was delivered:

  • Read the original task/requirement
  • List every feature/fix requested
  • Check each one was implemented (not just mentioned)
  • If scope was reduced without approval → Pattern #6 (Scope Reduction)

5. Code Quality Verification

Scan all changed files for:

  • pass (standalone, non-abstract) → dummy code
  • raise NotImplementedError (without @abstractmethod) → stub
  • TODO, FIXME, PLACEHOLDER, HACK → deferred work
  • print("debug"), console.log("test") → debug leftovers
  • Empty function bodies → incomplete implementation
  • If ANY found → NOT COMPLETE

6. Integration Verification

  • Every import resolves to a real file/module
  • Every API endpoint has a corresponding handler
  • Every database model has migrations
  • Every new dependency is in requirements/package.json
  • grep -rn "function_name" for changed functions — all callers still work

Read the full file on GitHub · 118 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 3d ago First seen · 118 lines · 48 tokens per session scan A 199415059266

Subscribe to this mod's changes

sentinel-verifier is an agent published in the GitHub repository tk-logl/sentinel (4 stars, last pushed 5mo ago), licensed MIT. It adds 48 tokens to every session and 1,061 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.