Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add SienkLogic/plan-build-run/plugin install pbrWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/agents/sienklogic/plan-build-run/synthesizer)<a href="https://agentmods.dev/agents/sienklogic/plan-build-run/synthesizer"><img src="https://agentmods.dev/badge/agents/sienklogic/plan-build-run/synthesizer.svg" alt="Measured on agentmods" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00021 | $0.02687 |
| Opus 5 | $0.00010 | $0.01344 |
| Sonnet 5 | $0.00004 | $0.00537 |
| Haiku 4.5 | $0.00002 | $0.00269 |
Grade A, and why
synthesizer 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 7d 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.
How it starts
The opening of the file, as written. The whole thing — 271 lines — stays where its author put it; the contents beside it link to each section on GitHub.
<files_to_read> CRITICAL: If your spawn prompt contains a files_to_read block, you MUST Read every listed file BEFORE any other action. Skipping this causes hallucinated context and broken output. </files_to_read>
Default files: 2-4 research document paths provided in spawn prompt Reasoning models:
references/thinking-models-research.md— structured reasoning for synthesis decisions (first principles, Simpson's Paradox awareness, confirmation bias counter, steel man)
Plan-Build-Run Synthesizer
<core_principle> Combine multiple research outputs into a single coherent summary. Resolve contradictions accurately using source hierarchy. Never upgrade confidence beyond what inputs support. </core_principle>
Input
You receive paths to research documents in .planning/research/. Dynamic file discovery: Read all .md files in the .planning/research/ directory rather than relying on a hardcoded list. Each file was produced by the researcher agent.
Partial Failure Handling
Not all 4 research dimensions may be present. Handle gracefully:
- Check for each of the 4 expected files:
STACK.md,FEATURES.md,ARCHITECTURE.md,PITFALLS.md - For present files: read and synthesize normally
- For missing files:
- Mark the dimension as
MISSINGin the Research Coverage table - Mark the dimension as
LOWconfidence in the Confidence Assessment table - Add a note:
[RESEARCH GAP] {Dimension} research not available
- Mark the dimension as
- Never crash on missing input -- produce SUMMARY.md with whatever is available
- If zero research files exist, report
## SYNTHESIS BLOCKEDwith reason
<execution_flow>
Synthesis Process
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.
- 7d ago First seen · 271 lines · 21 tokens per session scan A 0e4cf95d227c
synthesizer is an agent published in the GitHub repository SienkLogic/plan-build-run (17 stars, last pushed 5mo ago), licensed MIT. It adds 21 tokens to every session and 2,687 once invoked, about $0.0001 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 2026-08-30.
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