context examples on Programmer.ie: Modern AI programming

Account for the context you did not type

Mon, 01 Jan 0001 00:00:00 +0000

Most of what reaches a model is not what you typed. The chapter’s claim is that a context window has to be accounted for before anything else can be said about it, and the research harness can do that accounting from a captured invocation: the same capture that produced the model call produces the report.

Run it

git clone https://github.com/ernanhughes/project-context.git
cd project-context
git checkout b4e84a35bce27eff15584750e59131da49b1c049
python -m venv .venv
.venv/Scripts/pip install -e .
.venv/Scripts/contextlab debug panel fixtures/opencode-capture-v2/spool/captures.jsonl --output panel.html --svg-output panel.svg --json-output report.json

git clone https://github.com/ernanhughes/project-context.git
cd project-context
git checkout b4e84a35bce27eff15584750e59131da49b1c049
python -m venv .venv
.venv/Scripts/pip install -e .
.venv/Scripts/contextlab debug panel fixtures/opencode-capture-v2/spool/captures.jsonl --output panel.html --svg-output panel.svg --json-output report.json

Python 3.11 or later. The command is read-only over the fixture and writes only the three output files you named. No model is called and nothing leaves the machine.

Assemble for the task, or report that you cannot

Mon, 01 Jan 0001 00:00:00 +0000

The chapter’s question is whether assembly is possible at all, before any question about which candidates are best. A packer that treats required constraints as soft preferences produces a plausible-looking bundle whose declared obligations have been violated. The compiler here answers feasibility first, and its answer can be “no”.

Run it

git clone https://github.com/ernanhughes/project-context-compiler.git
cd project-context-compiler
git checkout 8d8bd31a20788c4c3298dfdffac741c507211a58
npm ci
node src/cli.ts conformance

git clone https://github.com/ernanhughes/project-context-compiler.git
cd project-context-compiler
git checkout 8d8bd31a20788c4c3298dfdffac741c507211a58
npm ci
node src/cli.ts conformance

Node 22 or later. The command is offline and deterministic: no model, no network, no service.

Compile a request into a bundle or a typed failure

Mon, 01 Jan 0001 00:00:00 +0000

The chapter that owns the implementation. A compiler here is a function from a request, a candidate pool and a policy to either a bundle or a typed failure, and it leaves a decision trace either way. The point of the trace is that a reader can disagree with a decision after the fact.

Run it

git clone https://github.com/ernanhughes/project-context-compiler.git
cd project-context-compiler
git checkout 8d8bd31a20788c4c3298dfdffac741c507211a58
npm ci
node src/cli.ts compile --request conformance/compiler-v1/mandatory-overflow.request.json --candidates conformance/compiler-v1/mandatory-overflow.candidates.json --policy conformance/compiler-v1/compiler-policy-v1.json

git clone https://github.com/ernanhughes/project-context-compiler.git
cd project-context-compiler
git checkout 8d8bd31a20788c4c3298dfdffac741c507211a58
npm ci
node src/cli.ts compile --request conformance/compiler-v1/mandatory-overflow.request.json --candidates conformance/compiler-v1/mandatory-overflow.candidates.json --policy conformance/compiler-v1/compiler-policy-v1.json

Node 22 or later. The command is offline and deterministic.

What a compilation proves, and where it refuses wrongly

Mon, 01 Jan 0001 00:00:00 +0000

A conformance suite shows the compiler agrees with a reference on the cases both of them were given. It does not show the compiler is complete — that a refusal to assemble is ever wrong. The chapter’s evidence for that question is a counterexample, and the repository ships one: a constructed case where the compiler says INSUFFICIENT_BUDGET and a legal bundle exists.

Run it

git clone https://github.com/ernanhughes/project-context-compiler.git
cd project-context-compiler
git checkout 8d8bd31a20788c4c3298dfdffac741c507211a58
npm ci
node scripts/feasibility-oracle.mjs conformance/completeness-v1

git clone https://github.com/ernanhughes/project-context-compiler.git
cd project-context-compiler
git checkout 8d8bd31a20788c4c3298dfdffac741c507211a58
npm ci
node scripts/feasibility-oracle.mjs conformance/completeness-v1

Node 22 or later. The oracle enumerates legal subsets exhaustively and shares the compiler’s cost units. No model, no network.