[deep-report] Strip bot-footer signatures from prompt-clustering text cleaning before vectorization

[github-actions]

Description

The Prompt Clustering Analysis workflow's clean_prompt() helper (around line 380 of the workflow .md) strips markdown code blocks, START COPILOT preambles, URLs, and special characters — but doesn't strip recurring bot-footer signatures embedded in PR bodies before TF-IDF vectorization. This cycle's Prompt Clustering Analysis — 2026-08-29 run flagged its own Cluster 1 as an artifact: 63 PRs (5.5% of the 1,140 analyzed) clustered together purely because of a repeated "PR Sous Chef ... Comment /souschef to run again" bot footer, not a coherent task theme. The same class of noise likely affects other bot-authored footers (e.g. <!-- gh-aw-agentic-workflow: ... --> HTML comments).

Expected Impact

Strips noise before vectorization so cluster assignments reflect actual task content rather than bot signatures — removing at least one full noise cluster (currently ~5.5% of all analyzed PRs) and improving keyword/theme accuracy for the remaining clusters.

Suggested Fix

In clean_prompt(), add a stripping step (before or alongside the existing markdown-code-block removal) for:

• <!--\s*gh-aw-agentic-workflow:.*?--> style HTML comment footers
• Known recurring bot-footer text patterns (e.g. "PR Sous Chef", "Comment /souschef to run again") — ideally via a small, extensible list/regex rather than one-off string matches, since new bot footers will appear over time.

Suggested Agent

prompt-clustering-analysis workflow author / New Agent

Estimated Effort

Quick (< 1 hour)

Data Source

DeepReport Intelligence Briefing analysis, 2026-08-29 cycle (window: discussions #56860–#56877, since prior baseline #56856). Source discussion: "Prompt Clustering Analysis - 2026-08-29" (#56873).

Warning

Firewall blocked 1 domain

The following domain was blocked by the firewall during workflow execution:

• api.anthropic.com

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "api.anthropic.com"

See Network Configuration for more information.

Generated by 🔬 Deep Report · claude · agent · 84.7 AIC · ⌖ 7.69 AIC · ⊞ 12.4K · ◷

• expires on Aug 31, 2026, 4:37 AM UTC-08:00