Web Evidence

Web Evidence

Use this skill when an agent workflow needs deterministic, redacted evidence for one HTTP or HTTPS URL.

Contract

Prereqs:

• web-evidence available on PATH from nils-cli 0.8.4 or newer.
• Static HTTP/HTTPS evidence only. This command does not drive a browser, execute JavaScript, reuse cookies, or use authenticated sessions.
• The caller chooses an explicit output directory, preferably under a project-scoped agent-out run directory.

Inputs:

• capture: required URL and --out DIR; optional --format text|json, --label LABEL, --method get|head,

--timeout-seconds N, --max-body-bytes N, and --body-preview-bytes N.

• completion: required shell name bash|zsh.

Outputs:

• web-evidence capture: writes a redacted artifact bundle under --out DIR.
• summary.json: versioned summary with request metadata, status classification, artifact paths, redaction counts, and error metadata.
• headers.redacted.json: request and response header names with sensitive values redacted.
• body-preview.redacted.txt: truncated, redacted text body preview when the response body is text.
• JSON stdout with --format json uses schema_version value cli.web-evidence.capture.v1.

Exit codes:

• 0: evidence captured and response classified as successful.
• 1: runtime, network, or HTTP status failure; when possible, the command still writes the redacted bundle.
• 64: usage or configuration error.

Failure modes:

• web-evidence is unavailable on PATH.
• URL is unsupported, malformed, or not HTTP/HTTPS.
• Output directory cannot be created or safely written.
• Network request fails, times out, or returns a failure HTTP status.
• Caller needs browser state, JavaScript execution, screenshots, console logs,

cookies, or auth headers; use Browser/Chrome/Playwright tooling instead.

Setup

Released PATH boundary:

web-evidence --help
web-evidence capture --help

Use the PATH command after installing nils-cli 0.8.4 or newer with nils-web-evidence on PATH.

Local checkout fallback boundary:

cargo run --locked --manifest-path "$HOME/Project/sympoies/nils-cli/Cargo.toml" \
  -p nils-web-evidence --bin web-evidence -- --help

Run the Cargo form from the workflow's target directory only when PATH is absent or reports an older nils-cli, and only from a validated local nils-cli checkout. Keep the same web-evidence subcommands and flags in both modes.

Commands (only entrypoints)

Released PATH command:

web-evidence capture  --out  [--format text|json] [--label ] [--method get|head]
web-evidence completion 

Local checkout fallback command:

cargo run --locked --manifest-path /path/to/nils-cli/Cargo.toml \
  -p nils-web-evidence --bin web-evidence --  ...

Do not reimplement HTTP fetching, redaction, schema generation, or artifact naming in skill-local scripts.

Workflow

1. Create or choose a run directory for the current task, usually with agent-out project --topic --mkdir.
2. Capture static evidence:

web-evidence capture --out /web-evidence --label --format json

1. Read summary.json or JSON stdout for ok, status_class, status_code, artifacts, and error.
2. Attach or cite only redacted artifacts from the bundle; do not preserve raw cookies, auth headers, URL secrets, or unredacted network logs.
3. If browser behavior is required, report that this static evidence command is insufficient and use a browser tool instead.

References

• docs/runbooks/skills/TOOLING_INDEX_V2.md

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: graysurf
• Source: graysurf/agent-kit
• License: MIT

Install and usage instructions live in the source repository linked above.